AE
Ash Elixir•2y ago
5avage

action argument default to another argument?

Trying to use the value passed in one argument as a default value for a second argument. Is there a way? Something like: 
  create :new_record do
    primary? true
    argument :short_name, :string, allow_nil?: false
    argument :long_name, :string, default: arg(:short_name)
    change set_attribute(:short_name, arg(:short_name))
    change set_attribute(:long_name, arg(:long_name))
  end
  create :new_record do
    primary? true
    argument :short_name, :string, allow_nil?: false
    argument :long_name, :string, default: arg(:short_name)
    change set_attribute(:short_name, arg(:short_name))
    change set_attribute(:long_name, arg(:long_name))
  end
I've tried a few variations on the above and keep getting InvalidArgument compilation errors from Ash.
1 Reply
ZachDaniel
ZachDaniel•2y ago
There is no built in way to do that you'll need to use a custom change 
change fn changeset, _ -> 
  case Ash.Changeset.fetch_argument(changeset, :long_name) do
    {:ok, _} -> changeset
    :error -> Ash.Changeset.set_argument(changeset, :long_name, Ash.Changeset.get_argument(changeset, :first_name))
  end
end
change fn changeset, _ -> 
  case Ash.Changeset.fetch_argument(changeset, :long_name) do
    {:ok, _} -> changeset
    :error -> Ash.Changeset.set_argument(changeset, :long_name, Ash.Changeset.get_argument(changeset, :first_name))
  end
end
that kind of thing

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