Specs

after_action(
  t(),
  (t(), [Ash.Resource.record()] ->
     {:ok, [Ash.Resource.record()]}
     | {:ok, [Ash.Resource.record()]}
     | {:error, term()})
) :: t()

Specs

aggregate(
  t() | Ash.Resource.t(),
  atom(),
  Ash.Query.Aggregate.kind(),
  atom() | [atom()],
  Keyword.t() | nil
) :: t()

Adds an aggregation to the query.

Aggregations are made available on the aggregates field of the records returned

The filter option accepts either a filter or a keyword list of options to supply to build a limiting query for that aggregate. See the DSL docs for each aggregate type in Ash.Resource.Dsl for more information.

Specs

before_action(t(), (t() -> t())) :: t()

Specs

build(Ash.Resource.t(), Ash.Api.t() | nil, Keyword.t()) :: t()

Builds a query from a keyword list.

This is used by certain query constructs like aggregates. It can also be used to manipulate a data structure before passing it to an ash query. It allows for building an entire query struct using only a keyword list.

For example:

Ash.Query.build(MyResource, filter: [name: "fred"], sort: [name: :asc], load: [:foo, :bar], offset: 10)

If you want to use the expression style filters, you can use expr/1. Be sure to require Ash.Query first, or import it. Consider importing only the expr/1 macro if you do that

For example:

import Ash.Query, only: [expr: 1]

Ash.Query.build(Myresource, filter: expr(name == "marge"))

Supported keys:

• filter - filter keyword/expr or %Ash.Filter{}
• sort - sort keyword
• limit - integer limit
• offset - integer offset
• load - keyword/list of atoms to load
• aggregate - {name, type, relationship}
• aggregate - {name, type, relationship, query_in_build_format}
• calculate - {name, module_and_opts}
• calculate - {name, module_and_opts, context}
• context: %{key: value}

Adds a calculation to the query.

Calculations are made available on the calculations field of the records returned

The module_and_opts argument accepts either a module or a {module, opts}. For more information on what that module should look like, see Ash.Calculation.

More features for calculations, like passing anonymous functions, will be supported in the future.

Return the underlying data layer query for an ash query

Remove an argument from the query

Ensure the the specified attributes are nil in the query results.

Specs

fetch_argument(t(), atom()) :: {:ok, term()} | :error

fetches the value of an argument provided to the query or :error

Attach a filter statement to the query.

The filter is applied as an "and" to any filters currently on the query. For more information on writing filters, see: Ash.Filter.

Creates a query for a given read action and prepares it.

Multitenancy is not validated until an action is called. This allows you to avoid specifying a tenant until just before calling the api action.

Arguments

Provide a map or keyword list of arguments for the read action

Opts

• :actor - set the actor, which can be used in any Ash.Resource.Changes configured on the action. (in the context argument)

• :tenant - set the tenant on the query

Specs

get_argument(t(), atom()) :: term()

Gets the value of an argument provided to the query

Specs

limit(t() | Ash.Resource.t(), nil | integer()) :: t()

Limit the results returned from the query

Specs

load(t() | Ash.Resource.t(), atom() | [atom()] | Keyword.t()) :: t()

Loads relationships, calculations, or aggregates on the resource.

Currently, loading attributes has no effects, as all attributes are returned. Before long, we will have the default list to load as the attributes, but if you say load(query, [:attribute1]), that will be the only field filled in. This will let data layers make more intelligent "select" statements as well.

# Loading nested relationships
Ash.Query.load(query, [comments: [:author, :ratings]])

# Loading relationships with a query
Ash.Query.load(query, [comments: [author: author_query]])

Create a new query

Specs

offset(t() | Ash.Resource.t(), nil | integer()) :: t()

Skip the first n records

Specs

put_context(t() | Ash.Resource.t(), atom(), term()) :: t()

Sets a specific context key to a specific value

See set_context/2 for more information.

Ensure that only the specified attributes are present in the results.

The first call to select/2 will replace the default behavior of selecting all attributes. Subsequent calls to select/2 will combine the provided fields unless the replace? option is provided with a value of true.

If a field has been deselected, selecting it again will override that (because a single list of fields is tracked for selection)

Primary key attributes and private attributes are always selected and cannot be deselected.

When attempting to load a relationship (or manage it with Ash.Changeset.manage_relationship/3), if the source field is not selected on the query/provided data an error will be produced. If loading a relationship with a query, an error is produced if the query does not select the destination field of the relationship.

Set the query's api, and any side loaded query's api

Add an argument to the query, which can be used in filter templates on actions

Merge a map of arguments to the arguments list

Specs

set_context(t() | Ash.Resource.t(), map() | nil) :: t()

Merge a map of values into the query context

Not much uses this currently.

Specs

set_tenant(t() | Ash.Resource.t(), String.t()) :: t()

Specs

sort(t() | Ash.Resource.t(), Ash.Sort.t()) :: t()

Sort the results based on attributes or aggregates (calculations are not yet supported)

Takes a list of fields to sort on, or a keyword list/mixed keyword list of fields and sort directions. The default sort direction is :asc.

Examples:

Ash.Query.sort(query, [:foo, :bar])

Ash.Query.sort(query, [:foo, bar: :desc])

Ash.Query.sort(query, [foo: :desc, bar: :asc])

Specs

unload(t(), [atom()]) :: t()

Removes a field from the list of fields to load

Specs

unset(Ash.Resource.t() | t(), atom() | [atom()]) :: t()