View Source Ash.Resource.Change behaviour (ash v3.0.7)

The behaviour for an action-specific resource change.

init/1 is defined automatically by use Ash.Resource.Change, but can be implemented if you want to validate/transform any options passed to the module.

The main function is change/3. It takes the changeset, any options that were provided when this change was configured on a resource, and the context, which currently only has the actor.

Summary

Callbacks

Runs on each batch result after it is dispatched to the data layer.

Whether or not batch callbacks should be run (if they are defined). Defaults to true.

Replaces change/3 for batch actions, allowing to optimize changes for bulk actions.

Runs on each batch before it is dispatched to the data layer.

Types

@type context() :: Ash.Resource.Change.Context.t()
@type ref() :: {module(), Keyword.t()} | module()
@type t() :: %Ash.Resource.Change{
  always_atomic?: term(),
  change: term(),
  description: term(),
  on: term(),
  only_when_valid?: term(),
  where: term()
}

Callbacks

Link to this callback

after_batch(changesets_and_results, opts, context)

View Source (optional)
@callback after_batch(
  changesets_and_results :: [{Ash.Changeset.t(), Ash.Resource.record()}],
  opts :: Keyword.t(),
  context :: Ash.Resource.Change.Context.t()
) ::
  :ok
  | Enumerable.t(
      {:ok, Ash.Resource.record()}
      | {:error, Ash.Error.t()}
      | Ash.Notifier.Notification.t()
    )

Runs on each batch result after it is dispatched to the data layer.

Link to this callback

atomic(t, t, t)

View Source (optional)
@callback atomic(Ash.Changeset.t(), Keyword.t(), Ash.Resource.Change.Context.t()) ::
  {:ok, Ash.Changeset.t()}
  | {:atomic, %{optional(atom()) => Ash.Expr.t() | {:atomic, Ash.Expr.t()}}}
  | {:atomic, Ash.Changeset.t(), %{optional(atom()) => Ash.Expr.t()}}
  | {:not_atomic, String.t()}
  | :ok
  | {:error, term()}
@callback atomic?() :: boolean()
Link to this callback

batch_callbacks?(changesets_or_query, opts, context)

View Source
@callback batch_callbacks?(
  changesets_or_query :: [Ash.Changeset.t()] | Ash.Query.t(),
  opts :: Keyword.t(),
  context :: Ash.Resource.Change.Context.t()
) :: boolean()

Whether or not batch callbacks should be run (if they are defined). Defaults to true.

Link to this callback

batch_change(changesets, opts, context)

View Source (optional)
@callback batch_change(
  changesets :: [Ash.Changeset.t()],
  opts :: Keyword.t(),
  context :: Ash.Resource.Change.Context.t()
) :: Enumerable.t(Ash.Changeset.t() | Ash.Notifier.Notification.t())

Replaces change/3 for batch actions, allowing to optimize changes for bulk actions.

Link to this callback

before_batch(changesets, opts, context)

View Source (optional)
@callback before_batch(
  changesets :: [Ash.Changeset.t()],
  opts :: Keyword.t(),
  context :: Ash.Resource.Change.Context.t()
) :: Enumerable.t(Ash.Changeset.t() | Ash.Notifier.Notification.t())

Runs on each batch before it is dispatched to the data layer.

Link to this callback

change(changeset, opts, context)

View Source (optional)
@callback change(
  changeset :: Ash.Changeset.t(),
  opts :: Keyword.t(),
  context :: Ash.Resource.Change.Context.t()
) :: Ash.Changeset.t()
@callback has_change?() :: boolean()
@callback init(opts :: Keyword.t()) :: {:ok, Keyword.t()} | {:error, term()}