GET routes of a generic action return no id fields even if they are public

[diogomrts]

Description
When setting up a GET route on a generic action, the resource's id is omitted from the response.

To Reproduce
In this example Resource you can see the issue:

defmodule TestRepo.Domain.Generic do
  use Ash.Resource,
    domain: TestRepo.Domain,
    extensions: [AshJsonApi.Resource]

  json_api do
    type("generic")

    routes do
      base "/generic"
      route(:get, "", :create)
    end
  end

  actions do
    action :create, {:array, :struct }do
      constraints items: [instance_of: __MODULE__]

      run fn input, context ->
        {:ok, [%__MODULE__{
          id: 1,
          name: "name"
        }]}
      end
    end
  end

  attributes do
    integer_primary_key(:id, writable?: true, public?: true)
    # attribute(:id, :integer, primary_key?: true, allow_nil?: false, public?: true)
    attribute(:name, :string, public?: true)
  end
end

The response JSON is:

[
  {
    "name": "name"
  }
]

Expected behavior
The expected response should be:

[
  {
    "id": 1,
    "name": "name"
  }
]

[zachdaniel]

Took me a while to get to this. I looked a the code thinking it would be relatively simple, but I don't see where we are for some reason omitting that id. Could you please put together a test or a reproduction?

[diogomrts]

I have added to this test_repo, please take a look at the Generic resource's /v1/generic endpoint

https://github.com/diogomrts/test_repo