Ash.Changeset.fetch_argument_or_change

You're seeing just the function fetch_argument_or_change, go back to Ash.Changeset module for more information.

fetch_argument_or_change(changeset, attribute)

fetch_argument_or_change(t(), atom()) :: {:ok, any()} | :error

Gets the value of an argument provided to the changeset, falling back to Ash.Changeset.fetch_change/2 if nothing was provided