Directly attach an after_action function to the query.

This function will be called by Ash.Query.after_action/2, with an additional context argument.

Example

prepare after_action(fn query, records, _context ->
  Logger.debug("Query for #{query.action.name} on resource #{inspect(query.resource)} returned #{length(records)} records")

  {:ok, records}
end)

Directly attach a before_action function to the query.

This function will be called by Ash.Query.before_action/2, with an additional context argument.

Example

prepare before_action(fn query, _context ->
  Logger.debug("About to execute query for #{query.action.name} on #{inspect(query.resource)}")

  query
end)

@spec build(Keyword.t()) :: Ash.Resource.Preparation.ref()

Passes the given keyword list to Ash.Query.build/2 with the query being prepared.

This allows declaring simple query modifications in-line.

To see the available options, see Ash.Query.build/2

Examples

prepare build(sort: [song_rank: :desc], limit: 10)
prepare build(load: [:friends])

@spec set_context(context :: map() | mfa()) :: Ash.Resource.Preparation.ref()

Merges the given query context.

If an MFA is provided, it will be called with the changeset. The MFA should return {:ok, context_to_be_merged} or {:error, term}

Examples

change set_context(%{something_used_internally: true})
change set_context({MyApp.Context, :set_context, []})