View Source API Reference ash v3.4.37

The primary interface to call actions and interact with resources.

Input for a custom action

A utility for limiting the number of concurrent async operations

The interface for an ash authorizer

The return value for bulk actions.

Changesets are used to create and update data in Ash.

Tools for introspecting managed relationships.

A value placed in changeset.data to indicate that the original data is not available

Represents a case insensitive string

Used to define the functions of a code interface for a resource.

Functions for working with the context provided to various callbacks in Ash.

A module for defining custom functions that can be called in Ash expressions.

The behaviour for backing resource actions with persistence layers.

An ETS (Erlang Term Storage) backed Ash Datalayer, for testing and lightweight usage.

Introspection helpers for the Ets data layer

An Mnesia backed Ash Datalayer.

Introspection helpers for Ash.DataLayer.Mnesia

A data layer that returns structs.

Ensures that all identities have a pre_check_with configured, or raises.

A domain allows you to interact with your resources, and holds domain-wide configuration.

A resource reference in a domain

Codemods for working with Ash.Domain modules

Introspection tools for Ash.Domain

Generate Mermaid diagrams from a specified domain.

Generate a Livebook from a specified domain.

Ensures that all resources for a given domain are not embeds.

Validate the arguments defined in the code interface and reject arguments that are not action attributes/arguments

Ensures that all related resources are included in a domain.

Tools and utilities used by Ash to manage and conform errors

Used when an invalid value is provided for an action argument

Used when an actor is referenced in a filter template, but no actor exists

Used when an invalid value is provided for an action argument

Used when an invalid value is provided for an attribute change

Used when a change is provided that covers multiple attributes/relationships

Used when an invalid value is provided for a relationship change

Used when a change is provided for an attribute that does not exist

Used when a change is provided for an relationship that does not exist

Used when an attribute or relationship is required

Used when a stale record is attempted to be updated or deleted

Tooling for creating an Ash exception

Used when authorization for an action fails

Used when a create action would be filtered

Used when a domain that has require_actor? true is provided no actor

Used when a domain that has authorize :always is provided authorize?: false

Raised in cases where access to a specific field was prevented

Used when initial data was not supplied when it was required

Used when unreachable code/conditions are reached in the framework

A placeholder exception that the user should never see

Raised when policy authorization for an action fails

Used when an unknown/generic framework error occurs

Used when unreachable code/conditions are reached in the framework

Used when a change that is only atomic cannot be done atomically

Used when unreachable code/conditions are reached in the framework

Used when a callback returns an invalid type

Used when an action that must be atomic cannot be done atomically

Used when the sycnrhonous engine cannot proceed

The top level invalid error

Used when page option is passed but pagination is not enabled.

Used when atomics for the given action type are not not supported by the data layer, but one is used.

Used when an invalid primary key is given to Ash.get/2

Used when no limit is provided, pagination is required, and no default page size is configured

Used when multiple results are returned in a case where only one result was expected

Used when an identity name is used that does not reference identity on the resource

Used when an identity name is used that does not reference identity on the resource

Used when an action name is provided that doesn't exist

Used when an action name is provided that doesn't exist

Used when an input is provided to an action or calculation that is not accepted

Used when a resource or alias is provided that doesn't exist

Used when page[:count] option is passed but the action's pagination is not countable.

Used when Ash.stream is used with an action that does not support keyset pagination

Used when page: false is provided but pagination is required

Used when a resource or alias is provided that cannot be used with the given domain

Used when a tenant is not specified

Used when a request to a domain times out.

Used when timeouts are not supported by the data layer, but one is set

Used when a given resource is unavailable.

Used when an invalid query is provided in a load

Used when attempting to load a relationship that does not exist

Used when a value is provided for a keyset that cannot be Base64 decoded.

Used when the data_layer does not support aggregates, or filtering/sorting them

Used when a calculation requires a primary key but was not supplied with one

Used when the data_layer does not support calculations, or filtering/sorting them

Used when an invalid value is provided for an action argument

Used when an invalid value is provided for a calculation argument

Used when an invalid expression is used in a filter

Used when an invalid reference is used in a filter

Used when an invalid value is provided for a filter

Used when an invalid limit is provided

Used when an invalid load is provided

Used when an invalid offset is provided

Used when an invalid page option is provided

A generic error that can be used to add an error to a query for a specific field

Used when an invalid sort order is provided

Used when the data_layer does not support a given lock type

Due to the filter-based implementation of keyset pagination, it cannot be used with sorts on calculations.

Used when a resource would be read but has no read action

Used when an attribute that doesn't exist is used in a query

Used when a field(attrbute, calculation, aggregate or relationship) that doesn't exist is used in a query

Used when a filter predicate that does not exist is referenced

Used when an function that doesn't exist is used in a query

Used when an operator that doesn't exist is used in a query

Used when an relationship that doesn't exist is used in a query

Used when an entity that not exist is referenced

Used when a relationship is filtered and the destination does not have a default read action

Used when an actor is referenced in a filter template, but no actor exists

Used when a filter or argument is required in a query

Used when attempting to sort on a field that cannot be used for sorting

Used when the data_layer does not support a provided predicate

Used when no data was provided to the simple data layer

A placeholder for a stacktrace so that we can avoid printing it everywhere

The top level unknown error container

Used when an unknown error occurs

Tools to build Ash expressions

A behavior of additional callbacks that extensions can implement, specific to Ash.

The representation of a filter in Ash.

Represents a predicate which can be simplified and/or compared with other predicates

Checks a record to see if it matches a filter statement.

Represents a simplified filter, with a simple list of predicates

A negated predicate

Represents a field that was hidden due to authorization rules.

Tools for generating input to Ash resource actions, as well as for seeds.

Codemods and utilities for working with Ash & Igniter

Helpers for Ash Mix tasks.

Used when a field hasn't been loaded or selected.

A notifier is an extension that receives various events

Represents a notification that will be handled by a resource's notifiers

A builtin notifier to help you publish events over any kind of pub-sub tooling.

Introspection helpers for Ash.Notifier.PubSub

Represents a configured publication from the pubsub notifier on an Ash.Resource

Helpers for working with nimble options

Types for Ash pages

A page of results from keyset based pagination.

A page of results from offset based pagination.

Helpers for working with the Plug connection.

An authorization extension for ash resources.

Adds field policies for any missing fields

Cache field policies for each field

Generates policy mermaid charts

A behaviour for declaring checks, which can be used to easily construct authorization rules.

This check is true when the current action is being run "through" a relationship.

This check is true when the action name matches the provided action name.

This check is true when the action type matches the provided type

This check is true when the value of the specified attribute of the actor equals the specified value.

This check is true when there is an actor specified, and false when the actor is nil.

The global authorization checks built into ash

This check is true when attribute changes correspond to the provided options.

This check is true when the specified relationship is changing

This check is true when the value of the specified key or path in the changeset or query context equals the specified value.

The check module used for exprs in policies

This check is true when the field provided is being referenced anywhere in a filter statement.

This check is true when the field or relationship, or path to field, is being loaded and false when it is not.

This check is true when the specified function returns true

This check passes if the data relates to the actor via the specified relationship or path of relationships.

This check is true when the specified relationship is being changed to the current actor.

This check is true when the resource matches the provided resource name or names.

This check is true when the field is being selected and false when it is not.

This check is always the result provided

Represents a field policy in an Ash.Resource

A type of check that is represented by a filter statement

An authorization extension for ash resources.

Represents a policy on an Ash.Resource

Represents a policy group on an Ash.Resource

A type of check that operates only on request context, never on the data

Helpers for working with processes and Ash actions.

A data structure for reading data from a resource.

Represents an aggregated association value

Represents a boolean expression

Represents a calculated attribute requested on a query

Represents a function call/AST node in an Ash query expression

Determines if a given related entity exists.

A function is a predicate with an arguments list.

Subtracts the given interval from the current time in UTC.

Gets an element in the list by index

Constructs a composite type in a way that is natively understood by the data layer

Returns true if the first string contains the second.

Returns the count of nil.

Adds the given interval to the current time in UTC

Adds the given interval to the current time in UTC

If the predicate is truthy, the provided exception is raised with the provided values.

Adds the given interval from the current time in UTC.

Adds the given interval from the current time in UTC.

Gets the value at the provided path in the value, which must be a map or embed.

If predicate is truthy, then the second argument is returned, otherwise the third.

true if the provided field is nil

Runs the provided MFA and returns the result as a known value.

Returns the length of a list attribute defined by the composite type {:array, Type}.

Multiplies the value by negative one

Returns the current datetime

Rounds a float, decimal or integer to the given number of points

Downcase a string

Joins a list of values.

Trims whitespace from a string

Split a string into a list of strings

Trims whitespace from a string

Returns the current date.

Casts the value to a given type. Can also be used to provide type hints to data layers, where appropriate.

Represents the negation of the contained expression

An operator is a predicate with a left and a right

left == right

left > right

left >= right

left in [1, 2, 3]

left is_nil true/false

left < right

left <= right

left != right

Used to access values from the "source" of a given expression.

Represents a relation/attribute reference

Returns the conflicting new information.

Ash.Reactor is a Reactor extension which provides steps for working with Ash resources and actions.

The Reactor step which is used to execute generic actions.

A reactor step which runs a step-module or an anonymous function, and enqueues any returned notifications before returning.

The Reactor stop which is used to execute create actions in bulk.

The Reactor stop which is used to execute create actions in bulk.

The Reactor step which is used to execute change steps.

The Reactor step which is used to execute create actions.

The Reactor step which is used to execute update actions.

The action entity for the Ash.Reactor reactor extension.

Add a load statement to an action.

Responsible for transforming actions.

Specify the actor used to execute an action.

The ash_step DSL module.

The bulk_create entity for the Ash.Reactor reactor extension.

The bulk_update entity for the Ash.Reactor reactor extension.

The change entity for the Ash.Reactor reactor extension.

Specify context to merge into an action's context.

The create entity for the Ash.Reactor reactor extension.

The destroy entity for the Ash.Reactor reactor extension.

The inputs entity for the Ash.Reactor reactor extension.

The load step entity for the Ash.Reactor reactor extension.

Ensures that the required middlewares are added to the Reactor.

The read entity for the Ash.Reactor reactor extension.

The read_one entity for the Ash.Reactor reactor extension.

Specify the tenant used to execute an action.

The transaction entity for the Ash.Reactor reactor extension.

The update entity for the Ash.Reactor reactor extension.

The Reactor step which is used to execute load steps.

A custom step which merges any number of inputs results into a single map.

Reactor middleware used to collect and emit notifications upon successful completion of the Reactor.

The Reactor step which is used to execute get actions.

The Reactor step which is used to execute read actions.

Reactor middleware which threads Ash's tracing information through to new processes spawned by Reactor.

The Reactor step which is used to wrap other steps in an Ash data layer transaction.

The Reactor step which is used to execute update actions.

A resource is a static definition of an entity in your system.

Types for Ash actions

Represents a custom action on a resource.

Represents an argument to an action

Represents a create action on a resource.

Represents a destroy action on a resource.

An implementation of a generic action.

The context passed into generic action functions

Represents metadata from an action

Represents a read action on a resource.

Represents the pagination configuration of a read action

Represents a update action on a resource.

Represents a named aggregate on the resource that can be loaded

The root behavior for a custom aggregate.

Represents a join filter on a resource aggregate

Represents an attribute on a resource

Helpers for building attributes

Tools for transforming resources in DSL Transformers.

The behaviour for defining a module calculation, and the struct for storing a defined calculation.

An argument to a calculation

Built in calculations that are automatically imported in the calculations section

The context and arguments of a calculation

Loads an attribute as a calculation.

Loads a relationship as a calculation.

Represents a function that evaluates a calculation in a resource's code interface

The behaviour for an action-specific resource change.

Built in changes that are available to all resources

Cascade a resource's destroy action to a related resource's destroy action.

Cascade a resource's update action to a related resource's update action.

The context for a change.

Refetches the record being updated or destroyed, and locks it with the given type.

Refetches the record being updated or destroyed, and locks it for update.

Increments an attribute's value by the amount specified, which defaults to 1.

Apply an "optimistic lock" on a record being updated or destroyed.

Introspection target for a filter for read actions and relationships

Represents a unique constraint on a resource

Codemods for working with Ash.Resource modules

Introspection for resources

Represents a function in a resource's code interface

A module to implement manual create actions.

The context passed into manual update action functions

A module to implement manual destroy actions.

The context passed into manual update action functions

A module to implement manual read actions.

A module to implement manual relationships.

The context passed into manual relationship functions

A module to implement manual update actions.

The context passed into manual update action functions

The behaviour for an action-specific query preparation.

Builtin query preparations

The context for a preparation.

Types Ash relationships

Represents a belongs_to relationship on a resource

Represents a has_many relationship on a resource

Represents a has_one relationship on a resource

Represents a many_to_many relationship on a resource

Persists attribute_names and attributes_by_name.

Creates the attribute for belongs_to relationships that have define_attribute?: true

Stores the set of valid input keys for each action

Persists commonly used calculation information.

Validates and caches the primary key of a resource

Persists commonly used relationship information.

Stores the set of unique keys for a resource

Creates an automatically named has_many relationship for each many_to_many.

Sets the default accept for each action

Transform any read actions which contain a get_by option.

Guesses the destination_attribute for has many and has one relationships unless provided

Guesses the destination_attribute_on_join_resource for many to many relationships unless provided.

Guesses the source_attribute_on_join_resource for many to many relationships unless provided.

Ensures that all actions have unique names.

Confirms that a resource does not have multiple fields(attributes, calculations, aggregates, and relationships) with the same name.

Validates the primary action configuration

Sets the source key on relationships to be the resource they were defined on

Persists global changes/validations and what type they go on.

Represents a validation in Ash.

Validates that the action is the specified action.

Built in validations that are available to all resources

Context for a validation.

Ensures that the field at the end of the path is an attribute or calculation.

Confirms that a resource does not use reserved names for field names.

Validates that accept and reject lists only contain valid attributes

Confirms that all action types declared on a resource are supported by its data layer

Confirms that all aggregates are supported by the data layer

Validate the arguments defined in the code interface and reject arguments that are not action attributes/arguments

Confirms that eager identities are not declared on a resource with no primary read.

Confirms that all action types declared on a resource are supported by its data layer

Ensures that the multitenancy configuration is valid for the given resource

Validates and caches the primary key of a resource

Validates that all relationships point to valid fields

Shows a warning on potentially incompatible relationship attributes.

Raises an error on update or destroy actions with require_atomic? set to true when it is known at compile time that they will not be atomic.

Returns an error if a generic action calls a Reactor module without specifying an argument for all expected inputs.

Raises an error on potentially incompatible identity attributes.

Raises an error when a required primary key is missing

Verifies that standard context keys are not used as calculation arguments

Raises an error when a required primary key is missing

Tools for working with the satsolver that drives filter subset checking (for authorization)

Helpers for seeding data, useful for quickly creating lots of data either for database seeding or testing.

Utilities and types for sorting.

Testing helpers for Ash.

Converts a value to a tenant. To add this to a resource, implement the protocol like so:application

A behaviour for implementing tracing for an Ash application.

A simple tracer that can send traces to the current process or call a module with the trace.

A span produced by Ash.Tracer.Simple

The Ash.Type behaviour is used to define a value type in Ash.

Stores an atom as a string in the database

Represents a binary.

Represents a boolean.

Stores a case insensitive string in the database

Helpers for working with Comparable

Represents a date in the database

Represents a datetime, with configurable precision and timezone.

Represents a decimal.

An interval of time, primarily meant to be used in expression functions

A type for abstracting enums into a single type.

A type that represents a file on the filesystem.

Behaviour for file implementations that are compatible with Ash.Type.File.

Protocol for allowing the casting of something into an Ash.Type.File.

Represents a float (floating point number)

Represents a function.

Represents a simple integer

Represents a keyword list, stored as a :map in the database.

Represents a map stored in the database.

Stores a module as a string in the database.

Represents a Naive datetime

Allows defining a new type that is the combination of an existing type and custom constraints

Stores a string in the database.

Represents a struct.

Represents a raw elixir term in the database

Represents a time in the database

Represents a UUID.

Represents a UUID.

A union between multiple types, distinguished with a tag or by attempting to validate.

Represents a binary that attempts to decode input strings as a url encoded base64 string.

Represents a utc datetime. A wrapper around :datetime for backwards compatibility.

Represents a utc datetime with nanosecond precision. A wrapper around :datetime for backwards compatibility.

Represents a vector.

Helpers for working with UUIDs

Helpers for working with UUIDs version 7.

A wrapper for values that are sourced from Ash.Type.Union.

A vector struct for Ash.

Provides utilities to implement and work with Comparable types

Protocol which describes ordering relation for pair of types

Runs all codegen tasks for any extension on any resource/domain in your application.

Generates a base resource

Generates an Ash.Domain

Generates an Ash.Type.Enum

Generate and configure an Ash.Resource.

Generates a Livebook for each Ash domain.

Generates a Mermaid Flow Chart for a given resource's policies.

Generates a Mermaid Resource Diagram for each Ash domain.

Installs Ash into a project. Should be called with mix igniter.install ash

Runs all migration tasks for any extension on any resource/domain in your application.

Adds an extension or extensions to the domain/resource

Runs all tear down tasks for any extension on any resource/domain in your application, followed by setup tasks.

Runs all rollback tasks for any extension on any resource/domain in your application.

Runs all setup tasks for any extension on any resource/domain in your application.

Runs all tear down tasks for any extension on any resource/domain in your application.