AE
Ash Elixir•3y ago
moxley

Does attribute `default: _` not set the struct's default value?

It appears that when defining an attribute's default: value, it doesn't set the default on the generated struct definition. I would expect it would, like Ecto.Schema does. Is there a reason it doesn't? Or is there a way of accomplishing this that I couldn't find in the documentation? 
defmodule GF.Ash.WebComponent do
  use Ash.Resource,
    data_layer: AshPostgres.DataLayer,
    extensions: [AshGraphql.Resource]

  alias GF.Ash.EmbeddedWebComponent

  attributes do
    attribute :attrs, {:array, EmbeddedWebComponent}, default: []
    attribute :usage, :atom,
      constraints: [one_of: [:attribute, :replacement]],
      default: :attribute
  end
end
defmodule GF.Ash.WebComponent do
  use Ash.Resource,
    data_layer: AshPostgres.DataLayer,
    extensions: [AshGraphql.Resource]

  alias GF.Ash.EmbeddedWebComponent

  attributes do
    attribute :attrs, {:array, EmbeddedWebComponent}, default: []
    attribute :usage, :atom,
      constraints: [one_of: [:attribute, :replacement]],
      default: :attribute
  end
end
component = %WebComponent{}
dbg(component.attrs) # nil
dbg(component.usage) # nil
component = %WebComponent{}
dbg(component.attrs) # nil
dbg(component.usage) # nil
3 Replies
ZachDaniel
ZachDaniel•3y ago
We don't do it, would just need to update this: https://github.com/ash-project/ash/blob/main/lib/ash/resource/schema.ex
GitHub
ash/schema.ex at main · ash-project/ash
A declarative and extensible framework for building Elixir applications. - ash/schema.ex at main · ash-project/ash
ZachDaniel
ZachDaniel•3y ago
we'd need to only set default if its not a function if you want to PR that I'd accept it 😄
moxley
moxleyOP•3y ago
Alright, cool. So it's unintentional, and open to PR. Sounds good!

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