View Source Ash.Api behaviour (ash v2.19.3)

An Api allows you to interact with your resources, and holds non-resource-specific configuration.

For example, the json api extension adds an api extension that lets you toggle authorization on/off for all resources in that Api. You include them in an Api like so:

defmodule MyApp.Registry do
  use Ash.Registry

  entries do
    entry OneResource
    entry SecondResource
  end
end

defmodule MyApp.Api do
  use Ash.Api

  resources do
    registry MyApp.Registry
  end
end

Then you can interact through that Api with the actions that those resources expose. For example: MyApp.Api.create(changeset), or MyApp.Api.read(query). Corresponding actions must be defined in your resources in order to call them through the Api.

Interface

The functions documented here can be used to call any action on any resource in the Api. For example, MyApi.read(Myresource, [...]).

Additionally, you can define a code_interface on each resource. See the code interface guide for more.

Summary

Types

aggregate()

load_statement()

page_request()

t()

Callbacks

aggregate(t, arg2, opts)

aggregate!(t, arg2, opts)

avg(t, field, opts)

Get the avg of a given field from the given query

avg!(t, field, opts)

Get the avg of a given field from the given query, raising any errors

bulk_create(list, resource, action, opts)

Creates many records.

bulk_create!(list, resource, action, opts)

Creates many records, raising on any errors. See bulk_create/2 for more.

bulk_destroy(arg1, atom, input, t)

Destroys all items in the provided enumerable or query with the provided input.

bulk_destroy!(arg1, atom, input, t)

Destroys all items in the provided enumerable or query with the provided input. See bulk_destroy/4 for more.

bulk_update(arg1, atom, input, t)

Updates all items in the provided enumerable or query with the provided input.

bulk_update!(arg1, atom, input, t)

Updates all items in the provided enumerable or query with the provided input. See bulk_update/4 for more.

calculate(resource, calculation, opts)

calculate!(resource, calculation, opts)

can(action_or_query_or_changeset, actor, opts)

Returns whether or not the user can perform the action, or :maybe, returning any errors.

can?(query_or_changeset_or_action, actor, opts)

Returns whether or not the user can perform the action, or raises on errors.

count(t, opts)

count!(t, opts)

create(t, opts)

Create a record.

create!(t, opts)

Create a record. See create/2 for more information.

destroy(arg1, opts)

Destroy a record.

destroy!(arg1, opts)

Destroy a record. See destroy/2 for more information.

exists(t, opts)

Whether or not the given query would return any results

exists?(t, opts)

Whether or not the given query would return any results, raising any errors

first(t, field, opts)

Get the first of a given field from the given query

first!(t, field, opts)

Get the first of a given field from the given query, raising any errors

get(resource, id_or_filter, params)

Get a record by a primary key.

get!(resource, id_or_filter, opts)

Get a record by a primary key. See get/3 for more.

list(t, field, opts)

Get list of a given field from the given query

list!(t, field, opts)

Get the list of a given field from the given query, raising any errors

load(record_or_records, query, opts)

Load fields or relationships on already fetched records.

load!(record_or_records, query, opts)

Load fields or relationships on already fetched records. See load/3 for more information.

max(t, field, opts)

Get the max of a given field from the given query

max!(t, field, opts)

Get the max of a given field from the given query, raising any errors

min(t, field, opts)

Get the min of a given field from the given query

min!(t, field, opts)

Get the min of a given field from the given query, raising any errors

page(page, page_request)

Fetch a page relative to the provided page.

page!(page, page_request)

Fetch a page relative to the provided page.

read(t, opts)

Run a query on a resource.

read!(arg1, opts)

Run an ash query. See read/2 for more.

read_one(arg1, opts)

Run a query on a resource, but fail on more than one result.

read_one!(arg1, opts)

Run an ash query, raising on more than one result. See read_one/2 for more.

reload(record)

Refetches a record by primary key.

reload!(record, params)

Refetches a record by primary key. See reload/1 for more.

run_action(input, opts)

Runs a generic action

run_action!(input, opts)

Runs a generic action, raising on errors

stream!(t, opts)

Streams the results of a query.

sum(t, field, opts)

Get the sum of a given field from the given query

sum!(t, field, opts)

Get the sum of a given field from the given query, raising any errors

update(t, opts)

Update a record.

update!(t, opts)

Update a record. See update/2 for more information.

Functions

aggregate(api, query, aggregate_or_aggregates, opts \\ [])

Runs an aggregate or aggregates over a resource query

allow(api) deprecated

See Ash.Api.Info.allow/1.

allow_unregistered?(api) deprecated

See Ash.Api.Info.allow_unregistered?/1.

authorize(api) deprecated

See Ash.Api.Info.authorize/1.

calculate(resource_or_record, calculation, opts \\ [])

Evaluates the calculation on the resource.

can(api, action_or_query_or_changeset, actor, opts \\ [])

can?(api, action_or_query_or_changeset, actor, opts \\ [])

destroy_opts_schema()

registry(api) deprecated

See Ash.Api.Info.registry/1.

require_actor?(api) deprecated

See Ash.Api.Info.require_actor?/1.

resource(api, resource) deprecated

See Ash.Api.Info.resource/2.

resources(api) deprecated

See Ash.Api.Info.resources/1.

run_action(api, input, opts \\ [])

Runs a generic action.

run_action!(api, input, opts \\ [])

stream!(api, query, opts \\ [])

timeout(api) deprecated

See Ash.Api.Info.timeout/1.

Types

aggregate()

@type aggregate() ::
  Ash.Query.Aggregate.t()
  | {name :: atom(), kind :: atom()}
  | {name :: atom(), kind :: atom(), opts :: Keyword.t()}

load_statement()

@type load_statement() ::
  Ash.Query.t()
  | [atom()]
  | atom()
  | Keyword.t()
  | [atom() | {atom(), atom() | Keyword.t()}]

page_request()

@type page_request() :: :next | :prev | :first | :last | :self | integer()

t()

@type t() :: module()

Callbacks

aggregate(t, arg2, opts)

@callback aggregate(
  Ash.Query.t(),
  aggregate() | [aggregate()],
  opts :: Keyword.t()
) :: {:ok, any()} | {:error, Ash.Error.t()}

aggregate!(t, arg2, opts)

@callback aggregate!(
  Ash.Query.t(),
  aggregate() | [aggregate()],
  opts :: Keyword.t()
) :: any() | no_return()

avg(t, field, opts)

@callback avg(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, Ash.Error.t()}

Get the avg of a given field from the given query

avg!(t, field, opts)

@callback avg!(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  term() | no_return()

Get the avg of a given field from the given query, raising any errors

bulk_create(list, resource, action, opts)

@callback bulk_create(
  [map()],
  resource :: Ash.Resource.t(),
  action :: atom(),
  opts :: Keyword.t()
) ::
  Ash.BulkResult.t()
  | Enumerable.t(
      {:ok, Ash.Resource.record()}
      | {:error, Ash.Changeset.t() | Ash.Error.t()}
      | {:notification, Ash.Notifier.Notification.t()}
    )

Creates many records.

Assumptions

We assume that the input is a list of changesets all for the same action, or a list of input maps for the same action with the :resource and :action option provided to illustrate which action it is for.

Performance/Feasibility

The performance of this operation depends on the data layer in question. Data layers like AshPostgres will choose reasonable batch sizes in an attempt to handle large bulk actions, but that does not mean that you can pass a list of 500k inputs and expect things to go off without a hitch (although it might). If you need to do large data processing, you should look into projects like GenStage and Broadway. With that said, if you want to do things like support CSV upload and you place some reasonable limits on the size this is a great tool. You'll need to test it yourself, YMMV.

Passing return_records?: true can significantly increase the time it takes to perform the operation, and can also make the operation completely unreasonable due to the memory requirement. If you want to do very large bulk creates and display all of the results, the suggestion is to annotate them with a "bulk_create_id" in the data layer, and then read the records with that bulk_create_id so that they can be retrieved later if necessary.

Changes/Validations

Changes will be applied in the order they are given on the actions as normal. Any change that exposes the bulk_change or bulk_validate callback will be applied on the entire list.

After Action Hooks

The following requirements must be met for after_action hooks to function properly. If they are not met, and an after_action hook being applied to a changeset in a change.

return_records? must be set to true.
The changeset must be setting the primary key as part of its changes, so that we know which result applies to which changeset.

It is possible to use after_action hooks with bulk_change/3, but you need to return the hooks along with the changesets. This allows for setting up after_action hooks that don't need access to the returned record, or after_action hooks that can operate on the entire list at once. See the documentation for that callback for more on how to do accomplish that.

Options

:upsert? (boolean/0) - If a conflict is found based on the primary key, the record is updated in the database (requires upsert support) The default value is false.
:upsert_identity (atom/0) - The identity to use when detecting conflicts for upsert?, e.g. upsert_identity: :full_name. By default, the primary key is used. Has no effect if upsert?: true is not provided
:load (term/0) - A load statement to apply to records. Ignored if return_records? is not true.
:select (list of atom/0) - A select statement to apply to records. Ignored if return_records? is not true.
:upsert_fields - The fields to upsert. If not set, the action's upsert_fields is used. Unlike singular create, bulk_create with upsert? requires that upsert_fields be specified explicitly in one of these two locations.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.
:assume_casted? (boolean/0) - Whether or not to cast attributes and arguments as input. This is an optimization for cases where the input is already casted and/or not in need of casting The default value is false.
:authorize_query_with - If set to :error, instead of filtering unauthorized query results, unauthorized query results will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:authorize_changeset_with - If set to :error, instead of filtering unauthorized changes, unauthorized changes will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:context (map/0) - Context to set on each changeset
:sorted? (boolean/0) - Whether or not to sort results by their input position, in cases where return_records?: true was provided. The default value is false.
:return_records? (boolean/0) - Whether or not to return all of the records that were inserted. Defaults to false to account for large inserts. The default value is false.
:return_errors? (boolean/0) - Whether or not to return all of the errors that occur. Defaults to false to account for large inserts. The default value is false.
:batch_size (pos_integer/0) - The number of records to include in each batch. Defaults to the default_limit or max_page_size of the action, or 100.
:return_stream? (boolean/0) - If set to true, instead of an Ash.BulkResult, a mixed stream is returned.
Potential elements:
{:notification, notification} - if return_notifications? is set to true {:ok, record} - if return_records? is set to true {:error, error} - an error that occurred. May be changeset or an invidual error. The default value is false.
:stop_on_error? (boolean/0) - If true, the first encountered error will stop the action and be returned. Otherwise, errors will be skipped. The default value is false.
:notify? (boolean/0) - Whether or not to send notifications out. If this is set to true then the data layer must return the results from each batch. This may be intensive for large bulk actions. The default value is false.
:transaction - Whether or not to wrap the entire execution in a transaction, each batch, or not at all.
Keep in mind:
before_transaction and after_transaction hooks attached to changesets will have to be run inside the transaction if you choose transaction: :all. Valid values are :all, :batch, false The default value is :batch.
:max_concurrency (non_neg_integer/0) - If set to a value greater than 0, up to that many tasks will be started to run batches asynchronously The default value is 0.

bulk_create!(list, resource, action, opts)

@callback bulk_create!(
  [map()],
  resource :: Ash.Resource.t(),
  action :: atom(),
  opts :: Keyword.t()
) :: Ash.BulkResult.t() | no_return()

Creates many records, raising on any errors. See bulk_create/2 for more.

:upsert? (boolean/0) - If a conflict is found based on the primary key, the record is updated in the database (requires upsert support) The default value is false.
:upsert_identity (atom/0) - The identity to use when detecting conflicts for upsert?, e.g. upsert_identity: :full_name. By default, the primary key is used. Has no effect if upsert?: true is not provided
:load (term/0) - A load statement to apply to records. Ignored if return_records? is not true.
:select (list of atom/0) - A select statement to apply to records. Ignored if return_records? is not true.
:upsert_fields - The fields to upsert. If not set, the action's upsert_fields is used. Unlike singular create, bulk_create with upsert? requires that upsert_fields be specified explicitly in one of these two locations.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.
:assume_casted? (boolean/0) - Whether or not to cast attributes and arguments as input. This is an optimization for cases where the input is already casted and/or not in need of casting The default value is false.
:authorize_query_with - If set to :error, instead of filtering unauthorized query results, unauthorized query results will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:authorize_changeset_with - If set to :error, instead of filtering unauthorized changes, unauthorized changes will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:context (map/0) - Context to set on each changeset
:sorted? (boolean/0) - Whether or not to sort results by their input position, in cases where return_records?: true was provided. The default value is false.
:return_records? (boolean/0) - Whether or not to return all of the records that were inserted. Defaults to false to account for large inserts. The default value is false.
:return_errors? (boolean/0) - Whether or not to return all of the errors that occur. Defaults to false to account for large inserts. The default value is false.
:batch_size (pos_integer/0) - The number of records to include in each batch. Defaults to the default_limit or max_page_size of the action, or 100.
:return_stream? (boolean/0) - If set to true, instead of an Ash.BulkResult, a mixed stream is returned.
Potential elements:
{:notification, notification} - if return_notifications? is set to true {:ok, record} - if return_records? is set to true {:error, error} - an error that occurred. May be changeset or an invidual error. The default value is false.
:stop_on_error? (boolean/0) - If true, the first encountered error will stop the action and be returned. Otherwise, errors will be skipped. The default value is false.
:notify? (boolean/0) - Whether or not to send notifications out. If this is set to true then the data layer must return the results from each batch. This may be intensive for large bulk actions. The default value is false.
:transaction - Whether or not to wrap the entire execution in a transaction, each batch, or not at all.
Keep in mind:
before_transaction and after_transaction hooks attached to changesets will have to be run inside the transaction if you choose transaction: :all. Valid values are :all, :batch, false The default value is :batch.
:max_concurrency (non_neg_integer/0) - If set to a value greater than 0, up to that many tasks will be started to run batches asynchronously The default value is 0.

bulk_destroy(arg1, atom, input, t)

@callback bulk_destroy(
  Enumerable.t(Ash.Resource.record()) | Ash.Query.t(),
  atom(),
  input :: map(),
  Keyword.t()
) :: Ash.BulkResult.t()

Destroys all items in the provided enumerable or query with the provided input.

If the data layer supports destroying from a query, and the destroy action can be done fully atomically, it will be updated in a single pass using the data layer.

Otherwise, this will stream each record and update it.

Options

:resource (atom/0) - The resource being updated. This must be provided if the input given is a stream, so we know ahead of time what the resource being updated is.
:stream_batch_size (integer/0) - Batch size to use if provided a query and the query must be streamed
:authorize_query? (boolean/0) - If a query is given, determines whether or not authorization is run on that query. The default value is true.
:strategy - The strategy or strategies to enable. :stream is used in all cases if the data layer does not support atomics. The default value is [:atomic, :atomic_batches, :stream].
:allow_stream_with - The 'worst' strategy allowed to be used to fetch records. See Ash.Api.stream!/2 docs for more. Valid values are :keyset, :offset, :full_read The default value is :keyset.
:stream_with - The specific strategy to use to fetch records. See Ash.Api.stream!/2 docs for more. Valid values are :keyset, :offset, :full_read
:page - Pagination options, see the pagination docs for more
:load (term/0) - A load statement to add onto the query
:lock (term/0) - A lock statement to add onto the query
:return_query? (boolean/0) - If true, the query that was ultimately used is returned as a third tuple element.
The query goes through many potential changes during a request, potentially adding authorization filters, or replacing relationships for other data layers with their corresponding ids. This option can be used to get the true query that was sent to the data layer. The default value is false.
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.
:assume_casted? (boolean/0) - Whether or not to cast attributes and arguments as input. This is an optimization for cases where the input is already casted and/or not in need of casting The default value is false.
:authorize_query_with - If set to :error, instead of filtering unauthorized query results, unauthorized query results will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:authorize_changeset_with - If set to :error, instead of filtering unauthorized changes, unauthorized changes will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:context (map/0) - Context to set on each changeset
:sorted? (boolean/0) - Whether or not to sort results by their input position, in cases where return_records?: true was provided. The default value is false.
:return_records? (boolean/0) - Whether or not to return all of the records that were inserted. Defaults to false to account for large inserts. The default value is false.
:return_errors? (boolean/0) - Whether or not to return all of the errors that occur. Defaults to false to account for large inserts. The default value is false.
:batch_size (pos_integer/0) - The number of records to include in each batch. Defaults to the default_limit or max_page_size of the action, or 100.
:return_stream? (boolean/0) - If set to true, instead of an Ash.BulkResult, a mixed stream is returned.
Potential elements:
{:notification, notification} - if return_notifications? is set to true {:ok, record} - if return_records? is set to true {:error, error} - an error that occurred. May be changeset or an invidual error. The default value is false.
:stop_on_error? (boolean/0) - If true, the first encountered error will stop the action and be returned. Otherwise, errors will be skipped. The default value is false.
:notify? (boolean/0) - Whether or not to send notifications out. If this is set to true then the data layer must return the results from each batch. This may be intensive for large bulk actions. The default value is false.
:transaction - Whether or not to wrap the entire execution in a transaction, each batch, or not at all.
Keep in mind:
before_transaction and after_transaction hooks attached to changesets will have to be run inside the transaction if you choose transaction: :all. Valid values are :all, :batch, false The default value is :batch.
:max_concurrency (non_neg_integer/0) - If set to a value greater than 0, up to that many tasks will be started to run batches asynchronously The default value is 0.

bulk_destroy!(arg1, atom, input, t)

@callback bulk_destroy!(
  Enumerable.t(Ash.Resource.record()) | Ash.Query.t(),
  atom(),
  input :: map(),
  Keyword.t()
) :: Ash.BulkResult.t() | no_return()

Destroys all items in the provided enumerable or query with the provided input. See bulk_destroy/4 for more.

bulk_update(arg1, atom, input, t)

@callback bulk_update(
  Enumerable.t(Ash.Resource.record()) | Ash.Query.t(),
  atom(),
  input :: map(),
  Keyword.t()
) :: Ash.BulkResult.t()

Updates all items in the provided enumerable or query with the provided input.

If the data layer supports updating from a query, and the update action can be done fully atomically, it will be updated in a single pass using the data layer.

Otherwise, this will stream each record and update it.

Options

:resource (atom/0) - The resource being updated. This must be provided if the input given is a stream, so we know ahead of time what the resource being updated is.
:atomic_update (map/0) - A map of atomic updates to apply. See Ash.Changeset.atomic_update/3 for more.
:stream_batch_size (integer/0) - Batch size to use if provided a query and the query must be streamed
:authorize_query? (boolean/0) - If a query is given, determines whether or not authorization is run on that query. The default value is true.
:select (list of atom/0) - A select statement to apply to records. Ignored if return_records? is not true.
:strategy - The strategy or strategies to enable. :stream is used in all cases if the data layer does not support atomics. The default value is [:atomic, :atomic_batches, :stream].
:allow_stream_with - The 'worst' strategy allowed to be used to fetch records. See Ash.Api.stream!/2 docs for more. Valid values are :keyset, :offset, :full_read The default value is :keyset.
:stream_with - The specific strategy to use to fetch records. See Ash.Api.stream!/2 docs for more. Valid values are :keyset, :offset, :full_read
:page - Pagination options, see the pagination docs for more
:load (term/0) - A load statement to add onto the query
:lock (term/0) - A lock statement to add onto the query
:return_query? (boolean/0) - If true, the query that was ultimately used is returned as a third tuple element.
The query goes through many potential changes during a request, potentially adding authorization filters, or replacing relationships for other data layers with their corresponding ids. This option can be used to get the true query that was sent to the data layer. The default value is false.
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.
:assume_casted? (boolean/0) - Whether or not to cast attributes and arguments as input. This is an optimization for cases where the input is already casted and/or not in need of casting The default value is false.
:authorize_query_with - If set to :error, instead of filtering unauthorized query results, unauthorized query results will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:authorize_changeset_with - If set to :error, instead of filtering unauthorized changes, unauthorized changes will raise an appropriate forbidden error Valid values are :filter, :error The default value is :filter.
:context (map/0) - Context to set on each changeset
:sorted? (boolean/0) - Whether or not to sort results by their input position, in cases where return_records?: true was provided. The default value is false.
:return_records? (boolean/0) - Whether or not to return all of the records that were inserted. Defaults to false to account for large inserts. The default value is false.
:return_errors? (boolean/0) - Whether or not to return all of the errors that occur. Defaults to false to account for large inserts. The default value is false.
:batch_size (pos_integer/0) - The number of records to include in each batch. Defaults to the default_limit or max_page_size of the action, or 100.
:return_stream? (boolean/0) - If set to true, instead of an Ash.BulkResult, a mixed stream is returned.
Potential elements:
{:notification, notification} - if return_notifications? is set to true {:ok, record} - if return_records? is set to true {:error, error} - an error that occurred. May be changeset or an invidual error. The default value is false.
:stop_on_error? (boolean/0) - If true, the first encountered error will stop the action and be returned. Otherwise, errors will be skipped. The default value is false.
:notify? (boolean/0) - Whether or not to send notifications out. If this is set to true then the data layer must return the results from each batch. This may be intensive for large bulk actions. The default value is false.
:transaction - Whether or not to wrap the entire execution in a transaction, each batch, or not at all.
Keep in mind:
before_transaction and after_transaction hooks attached to changesets will have to be run inside the transaction if you choose transaction: :all. Valid values are :all, :batch, false The default value is :batch.
:max_concurrency (non_neg_integer/0) - If set to a value greater than 0, up to that many tasks will be started to run batches asynchronously The default value is 0.

bulk_update!(arg1, atom, input, t)

@callback bulk_update!(
  Enumerable.t(Ash.Resource.record()) | Ash.Query.t(),
  atom(),
  input :: map(),
  Keyword.t()
) :: Ash.BulkResult.t() | no_return()

Updates all items in the provided enumerable or query with the provided input. See bulk_update/4 for more.

calculate(resource, calculation, opts)

@callback calculate(
  resource :: Ash.Resource.t(),
  calculation :: atom(),
  opts :: Keyword.t()
) ::
  {:ok, term()} | {:error, term()}

calculate!(resource, calculation, opts)

@callback calculate!(
  resource :: Ash.Resource.t(),
  calculation :: atom(),
  opts :: Keyword.t()
) ::
  term() | no_return()

can(action_or_query_or_changeset, actor, opts)

@callback can(
  action_or_query_or_changeset ::
    Ash.Query.t()
    | Ash.Changeset.t()
    | Ash.ActionInput.t()
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action()}
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action(), input :: map()},
  actor :: term(),
  opts :: Keyword.t()
) ::
  {:ok, boolean() | :maybe}
  | {:ok, true, Ash.Changeset.t() | Ash.Query.t()}
  | {:ok, true, Ash.Changeset.t(), Ash.Query.t()}
  | {:ok, false, Exception.t()}
  | {:error, term()}

Returns whether or not the user can perform the action, or :maybe, returning any errors.

In cases with "runtime" checks (checks after the action), we may not be able to determine an answer, and so the value :maybe will be returned from can/2. The can? function assumes that :maybe means true. Keep in mind, this is just for doing things like "can they do this" in a UI, so assuming :maybe is true is fine. The actual action invocation will be properly checked regardless. If you have runtime checks, you may need to use can instead of can?, or configure what :maybe means.

Options

maybe_is - What to treat :maybe results as, defaults to true if using can?, or :maybe if using can.
run_queries? - In order to determine authorization status for changesets that use filter checks, we may need to run queries (almost always only one query). Set this to false to disable (returning :maybe instead). The default value is true.
data - A record or list of records. For authorizing reads with filter checks, this can be provided and a filter check will only be true if all records match the filter. This is detected by running a query.
alter_source? - If true, the query or changeset will be returned with authorization modifications made. For a query, this mans adding field visibility calculations and altering the filter or the sort. For a changeset, this means only adding field visibility calculations. The default value is false.
base_query - If authorizing an update, some cases can return both a new changeset and a query filtered for only things that will be authorized to update. Providing the base_query will cause that query to be altered instead of a new one to be generated.
no_check? - If set to true, the query will not run the checks for runtime policies, and will instead consider the policy to have failed. This is used for things like atomic updates, where the policies must check with strict check or filter checks.
atomic_changeset - A changeset to use to fill any atomic_ref templates.
filter_with - If set to :error, any filter authorization will produce an error on matches, otherwise matches will be filtered out.

can?(query_or_changeset_or_action, actor, opts)

@callback can?(
  query_or_changeset_or_action ::
    Ash.Query.t()
    | Ash.Changeset.t()
    | Ash.ActionInput.t()
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action()}
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action(), input :: map()},
  actor :: term(),
  opts :: Keyword.t()
) :: boolean() | no_return()

Returns whether or not the user can perform the action, or raises on errors.

See can/3 for more info.

count(t, opts)

@callback count(Ash.Query.t(), opts :: Keyword.t()) ::
  {:ok, integer()} | {:error, Ash.Error.t()}

count!(t, opts)

@callback count!(Ash.Query.t(), opts :: Keyword.t()) :: integer() | no_return()

create(t, opts)

@callback create(Ash.Changeset.t(), opts :: Keyword.t()) ::
  {:ok, Ash.Resource.record()}
  | {:ok, Ash.Resource.record(), [Ash.Notifier.Notification.t()]}
  | {:error, term()}

Create a record.

:upsert? (boolean/0) - If a conflict is found based on the primary key, the record is updated in the database (requires upsert support) The default value is false.
:upsert_identity (atom/0) - The identity to use when detecting conflicts for upsert?, e.g. upsert_identity: :full_name. By default, the primary key is used. Has no effect if upsert?: true is not provided
:upsert_fields - The fields to upsert. If not set, the action's upsert_fields is used, and if that is not set, then any fields not being set to defaults are written.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.

create!(t, opts)

@callback create!(Ash.Changeset.t(), opts :: Keyword.t()) ::
  Ash.Resource.record()
  | {Ash.Resource.record(), [Ash.Notifier.Notification.t()]}
  | no_return()

Create a record. See create/2 for more information.

destroy(arg1, opts)

@callback destroy(Ash.Changeset.t() | Ash.Resource.record(), opts :: Keyword.t()) ::
  :ok
  | {:ok, Ash.Resource.record()}
  | {:ok, [Ash.Notifier.Notification.t()]}
  | {:ok, Ash.Resource.record(), [Ash.Notifier.Notification.t()]}
  | {:error, term()}

Destroy a record.

:return_destroyed? (boolean/0) - If true, the destroyed record is included in the return result, e.g {:ok, destroyed} or {:ok, destroyed, notifications} The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.

destroy!(arg1, opts)

@callback destroy!(Ash.Changeset.t() | Ash.Resource.record(), opts :: Keyword.t()) ::
  :ok
  | Ash.Resource.record()
  | [Ash.Notifier.Notification.t()]
  | {Ash.Resource.record(), [Ash.Notifier.Notification.t()]}
  | no_return()

Destroy a record. See destroy/2 for more information.

exists(t, opts)

@callback exists(Ash.Query.t(), opts :: Keyword.t()) ::
  {:ok, boolean()} | {:error, Ash.Error.t()}

Whether or not the given query would return any results

exists?(t, opts)

@callback exists?(Ash.Query.t(), opts :: Keyword.t()) :: boolean() | no_return()

Whether or not the given query would return any results, raising any errors

first(t, field, opts)

@callback first(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, Ash.Error.t()}

Get the first of a given field from the given query

first!(t, field, opts)

@callback first!(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  term() | no_return()

Get the first of a given field from the given query, raising any errors

get(resource, id_or_filter, params)

@callback get(
  resource :: Ash.Resource.t(),
  id_or_filter :: term(),
  params :: Keyword.t()
) :: {:ok, Ash.Resource.record()} | {:ok, nil} | {:error, term()}

Get a record by a primary key.

For a resource with a composite primary key, pass a keyword list, e.g MyApi.get(MyResource, first_key: 1, second_key: 2)

:error? (boolean/0) - Whether or not an error should be returned or raised when the record is not found. If set to false, nil will be returned. The default value is true.
:load (term/0) - Fields or relationships to load in the query. See Ash.Query.load/2
:lock (term/0) - A lock statement to add onto the query
:context (term/0) - Context to be set on the query being run
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access

get!(resource, id_or_filter, opts)

@callback get!(
  resource :: Ash.Resource.t(),
  id_or_filter :: term(),
  opts :: Keyword.t()
) :: Ash.Resource.record() | no_return()

Get a record by a primary key. See get/3 for more.

list(t, field, opts)

@callback list(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  {:ok, [term()]} | {:error, Ash.Error.t()}

Get list of a given field from the given query

list!(t, field, opts)

@callback list!(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  [term()] | no_return()

Get the list of a given field from the given query, raising any errors

load(record_or_records, query, opts)

@callback load(
  record_or_records :: Ash.Resource.record() | [Ash.Resource.record()],
  query :: load_statement(),
  opts :: Keyword.t()
) :: {:ok, Ash.Resource.record() | [Ash.Resource.record()]} | {:error, term()}

Load fields or relationships on already fetched records.

Accepts a list of non-loaded fields and loads them on the provided records or a query, in which case the loaded fields of the query are used. Relationship loads can be nested, for example: MyApi.load(record, [posts: [:comments]]).

:lazy? (boolean/0) - If set to true, values will only be loaded if the related value isn't currently loaded. The default value is false.
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access

load!(record_or_records, query, opts)

@callback load!(
  record_or_records :: Ash.Resource.record() | [Ash.Resource.record()],
  query :: load_statement(),
  opts :: Keyword.t()
) :: Ash.Resource.record() | [Ash.Resource.record()] | no_return()

Load fields or relationships on already fetched records. See load/3 for more information.

max(t, field, opts)

@callback max(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, Ash.Error.t()}

Get the max of a given field from the given query

max!(t, field, opts)

@callback max!(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  term() | no_return()

Get the max of a given field from the given query, raising any errors

min(t, field, opts)

@callback min(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, Ash.Error.t()}

Get the min of a given field from the given query

min!(t, field, opts)

@callback min!(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  term() | no_return()

Get the min of a given field from the given query, raising any errors

page(page, page_request)

@callback page(Ash.Page.page(), page_request()) ::
  {:ok, Ash.Page.page()} | {:error, term()}

Fetch a page relative to the provided page.

A page is the return value of a paginated action called via read/2.

page!(page, page_request)

@callback page!(Ash.Page.page(), page_request()) :: Ash.Page.page() | no_return()

Fetch a page relative to the provided page.

read(t, opts)

@callback read(Ash.Query.t(), opts :: Keyword.t()) ::
  {:ok, [Ash.Resource.record()]}
  | {:ok, [Ash.Resource.record()], Ash.Query.t()}
  | {:error, term()}

Run a query on a resource.

For more information on building a query, see Ash.Query.

:page - Pagination options, see the pagination docs for more
:load (term/0) - A load statement to add onto the query
:max_concurrency (non_neg_integer/0) - The maximum number of processes allowed to be started for parallel loading of relationships and calculations. Defaults to System.schedulers_online() * 2
:lock (term/0) - A lock statement to add onto the query
:return_query? (boolean/0) - If true, the query that was ultimately used is returned as a third tuple element.
The query goes through many potential changes during a request, potentially adding authorization filters, or replacing relationships for other data layers with their corresponding ids. This option can be used to get the true query that was sent to the data layer. The default value is false.
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access

Pagination

Limit/offset pagination

:offset (non_neg_integer/0) - The number of records to skip from the beginning of the query
:limit (pos_integer/0) - The number of records to include in the page
:filter (term/0) - A filter to apply for pagination purposes, that should not be considered in the full count.
This is used by the liveview paginator to only fetch the records that were already on the page when refreshing data, to avoid pages jittering.
:count (boolean/0) - Whether or not to return the page with a full count of all records

Keyset pagination

:before (String.t/0) - Get records that appear before the provided keyset (mutually exclusive with after)
:after (String.t/0) - Get records that appear after the provided keyset (mutually exclusive with before)
:limit (pos_integer/0) - How many records to include in the page
:filter (term/0) - See the filter option for offset pagination, this behaves the same.
:count (boolean/0) - Whether or not to return the page with a full count of all records

read!(arg1, opts)

@callback read!(Ash.Query.t() | Ash.Resource.t(), opts :: Keyword.t()) ::
  [Ash.Resource.record()]
  | {[Ash.Resource.record()], Ash.Query.t()}
  | no_return()

Run an ash query. See read/2 for more.

read_one(arg1, opts)

@callback read_one(Ash.Query.t() | Ash.Resource.t(), opts :: Keyword.t()) ::
  {:ok, Ash.Resource.record()}
  | {:ok, Ash.Resource.record(), Ash.Query.t()}
  | {:ok, nil}
  | {:error, term()}

Run a query on a resource, but fail on more than one result.

This is useful if you have a query that doesn't include a primary key but you know that it will only ever return a single result.

Options

:not_found_error? (boolean/0) - Whether or not to return an Ash.Error.Query.NotFound if no record is found. The default value is false.
:page - Pagination options, see the pagination docs for more
:load (term/0) - A load statement to add onto the query
:max_concurrency (non_neg_integer/0) - The maximum number of processes allowed to be started for parallel loading of relationships and calculations. Defaults to System.schedulers_online() * 2
:lock (term/0) - A lock statement to add onto the query
:return_query? (boolean/0) - If true, the query that was ultimately used is returned as a third tuple element.
The query goes through many potential changes during a request, potentially adding authorization filters, or replacing relationships for other data layers with their corresponding ids. This option can be used to get the true query that was sent to the data layer. The default value is false.
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access

read_one!(arg1, opts)

@callback read_one!(Ash.Query.t() | Ash.Resource.t(), opts :: Keyword.t()) ::
  Ash.Resource.record()
  | {Ash.Resource.record(), Ash.Query.t()}
  | nil
  | no_return()

Run an ash query, raising on more than one result. See read_one/2 for more.

reload(record)

@callback reload(record :: Ash.Resource.record()) ::
  {:ok, Ash.Resource.record()} | {:error, term()}

Refetches a record by primary key.

reload!(record, params)

@callback reload!(record :: Ash.Resource.record(), params :: Keyword.t()) ::
  Ash.Resource.record() | no_return()

Refetches a record by primary key. See reload/1 for more.

run_action(input, opts)

@callback run_action(input :: Ash.ActionInput.t(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, term()}

Runs a generic action

run_action!(input, opts)

@callback run_action!(input :: Ash.ActionInput.t(), opts :: Keyword.t()) ::
  term() | no_return()

Runs a generic action, raising on errors

stream!(t, opts)

@callback stream!(Ash.Query.t(), opts :: Keyword.t()) ::
  Enumerable.t(Ash.Resource.record())

Streams the results of a query.

Strategies

There are three strategies supported, and the best one available is always chosen. They are, in order from best to worst:

:keyset
:offset
:full_read

By default, only :keyset is supported. If you want to allow worse strategies to be used, pass the worst one you wish to allow as the allow_stream_with option, i.e allow_stream_with: :full_read. If you wish to specify a specific strategy to use, pass stream_with: :strategy_name.

Keyset

This utilizes keyset pagination to accomplish this stream. The action must support keyset pagination. This is the most efficient way to stream a query, because it works by using filters which can benefit from indexes in the data layer.

Offset

This utilizes offset/limit to accomplish this stream. If the action supports offset pagination, that will be used. Otherwise, if the data layer supports limit/offset, then explicit limits/offsets will be used. This is a much less efficient way of streaming a resource than keyset. To use limit/offset to reliably stream, a sort must always be applied, and limit/offset in the data layer will generally require sorting the entire table to figure out what is in each batch.

Full Read

This reads the entire table into memory with no limit. This is, generally speaking, the least efficient.

Options

:batch_size (integer/0) - How many records to request in each query run. Defaults to the pagination limits on the resource, or 250.
:allow_stream_with - The 'worst' strategy allowed to be used to fetch records. See Ash.Api.stream!/2 docs for more. Valid values are :keyset, :offset, :full_read The default value is :keyset.
:stream_with - The specific strategy to use to fetch records. See Ash.Api.stream!/2 docs for more. Valid values are :keyset, :offset, :full_read
:page - Pagination options, see the pagination docs for more
:load (term/0) - A load statement to add onto the query
:max_concurrency (non_neg_integer/0) - The maximum number of processes allowed to be started for parallel loading of relationships and calculations. Defaults to System.schedulers_online() * 2
:lock (term/0) - A lock statement to add onto the query
:return_query? (boolean/0) - If true, the query that was ultimately used is returned as a third tuple element.
The query goes through many potential changes during a request, potentially adding authorization filters, or replacing relationships for other data layers with their corresponding ids. This option can be used to get the true query that was sent to the data layer. The default value is false.
:reselect_all? (boolean/0) - Whether or not to reselect all attributes depended on by loads. By default, we only reselect fields that weren't already selected. The default value is false.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access

sum(t, field, opts)

@callback sum(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, Ash.Error.t()}

Get the sum of a given field from the given query

sum!(t, field, opts)

@callback sum!(Ash.Query.t(), field :: atom(), opts :: Keyword.t()) ::
  term() | no_return()

Get the sum of a given field from the given query, raising any errors

update(t, opts)

@callback update(Ash.Changeset.t(), opts :: Keyword.t()) ::
  {:ok, Ash.Resource.record()}
  | {:ok, Ash.Resource.record(), [Ash.Notifier.Notification.t()]}
  | {:error, term()}

Update a record.

:params (map/0) - Parameters to supply, ignored if the input is a changeset, only used when an identifier is given.
:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access
:return_notifications? (boolean/0) - Use this if you're running ash actions in your own transaction and you want notifications to happen still.
If a transaction is ongoing, and this is false, notifications will be discarded, otherwise the return value is {:ok, result, notifications} (or {:ok, notifications})
To send notifications later, use Ash.Notifier.notify(notifications). It sends any notifications that can be sent, and returns the rest. The default value is false.
:rollback_on_error? (boolean/0) - Whether or not to rollback the transaction on error, if the resource is in a transaction.
If the action has transaction? false this option has no effect. If an error is returned from the data layer and the resource is in a transaction, the transaction is always rolled back, regardless. The default value is true.
:notification_metadata (term/0) - Metadata to be merged into the metadata field for all notifications sent from this operation. The default value is %{}.

update!(t, opts)

@callback update!(Ash.Changeset.t(), opts :: Keyword.t()) ::
  Ash.Resource.record()
  | {Ash.Resource.record(), [Ash.Notifier.Notification.t()]}
  | no_return()

Update a record. See update/2 for more information.

Functions

aggregate(api, query, aggregate_or_aggregates, opts \\ [])

@spec aggregate(
  api :: t(),
  Ash.Query.t() | Ash.Resource.t(),
  aggregates :: aggregate() | [aggregate()],
  opts :: Keyword.t()
) :: {:ok, term()} | {:error, Ash.Error.t()}

Runs an aggregate or aggregates over a resource query

:timeout (timeout/0) - A positive integer, or :infinity. If none is provided, the timeout configured on the api is used (which defaults to 30_000).
:tracer - A tracer that implements the Ash.Tracer behaviour. See that module for more.
:verbose? (boolean/0) - Log engine operations (very verbose!) The default value is false.
:action (term/0) - The action to use, either an Action struct or the name of the action
:authorize? - If an actor option is provided (even if it is nil), authorization happens automatically. If not, this flag can be used to authorize with no user. Valid values are true, false, nil
:stacktraces? (boolean/0) - For Ash errors, whether or not each error has a stacktrace. See the error_handling guide for more. The default value is true.
:tenant (term/0) - A tenant to set on the query or changeset
:actor (term/0) - If an actor is provided, it will be used in conjunction with the authorizers of a resource to authorize access

allow(api)

This function is deprecated. use Ash.Api.Info.allow/1 instead.

See Ash.Api.Info.allow/1.

allow_unregistered?(api)

This function is deprecated. use Ash.Api.Info.allow_unregistered?/1 instead.

See Ash.Api.Info.allow_unregistered?/1.

authorize(api)

This function is deprecated. use Ash.Api.Info.authorize/1 instead.

See Ash.Api.Info.authorize/1.

calculate(resource_or_record, calculation, opts \\ [])

Evaluates the calculation on the resource.

If a record is provided, its field values will be used to evaluate the calculation.

:args (map/0) - Values for arguments referenced by the calculation. The default value is %{}.
:refs (map/0) - Values for references used by the calculation. The default value is %{}.
:actor (term/0) - The actor for handling ^actor/1 templates, supplied to calculation context.
:tenant (term/0) - The tenant, supplied to calculation context.
:authorize? (boolean/0) - Whether or not the request is being authorized, provided to calculation context. The default value is true.
:tracer - A tracer, provided to the calculation context.
:record (term/0) - A record to use as the base of the calculation

can(api, action_or_query_or_changeset, actor, opts \\ [])

@spec can(
  api :: t(),
  action_or_query_or_changeset ::
    Ash.Query.t()
    | Ash.Changeset.t()
    | Ash.ActionInput.t()
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action()}
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action(), input :: map()},
  actor :: term(),
  opts :: Keyword.t()
) ::
  {:ok, boolean() | :maybe}
  | {:ok, true, Ash.Changeset.t() | Ash.Query.t()}
  | {:ok, true, Ash.Changeset.t(), Ash.Query.t()}
  | {:ok, false, Exception.t()}
  | {:error, term()}

can?(api, action_or_query_or_changeset, actor, opts \\ [])

@spec can?(
  api :: t(),
  query_or_changeset_or_action ::
    Ash.Query.t()
    | Ash.Changeset.t()
    | Ash.ActionInput.t()
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action()}
    | {Ash.Resource.t(), atom() | Ash.Resource.Actions.action(), input :: map()},
  actor :: term(),
  opts :: Keyword.t()
) :: boolean() | no_return()

destroy_opts_schema()

registry(api)

This function is deprecated. use Ash.Api.Info.registry/1 instead.

See Ash.Api.Info.registry/1.

require_actor?(api)

This function is deprecated. use Ash.Api.Info.require_actor?/1 instead.

See Ash.Api.Info.require_actor?/1.

resource(api, resource)

This function is deprecated. use Ash.Api.Info.resource/2 instead.

See Ash.Api.Info.resource/2.

resources(api)

This function is deprecated. use Ash.Api.Info.resources/1 instead.

See Ash.Api.Info.resources/1.

run_action(api, input, opts \\ [])

@spec run_action(api :: t(), input :: Ash.ActionInput.t(), opts :: Keyword.t()) ::
  {:ok, term()} | {:error, Ash.Error.t()}

Runs a generic action.

Options:

:actor (term/0) - The actor for handling ^actor/1 templates, supplied to calculation context.
:tenant (term/0) - The tenant, supplied to calculation context.
:authorize? (boolean/0) - Whether or not the request should be authorized.
:tracer - A tracer, provided to the calculation context.

run_action!(api, input, opts \\ [])

@spec run_action!(api :: t(), input :: Ash.ActionInput.t(), opts :: Keyword.t()) ::
  term() | no_return()

stream!(api, query, opts \\ [])

@spec stream!(api :: module(), query :: Ash.Query.t(), opts :: Keyword.t()) ::
  Enumerable.t(Ash.Resource.record())

timeout(api)

This function is deprecated. use Ash.Api.Info.timeout/1 instead.

See Ash.Api.Info.timeout/1.