department.ex gist for multitenant

department.ex

defmodule MyAshPhoenixApp.Client.Department do
  use Ash.Resource,
    domain: MyAshPhoenixApp.Client,
    data_layer: AshPostgres.DataLayer

  multitenancy do 
    strategy :attribute # ----->>>>>> causes warning 
    attribute :id 
    # attribute :domain
  end

  postgres do
    table "departments"
    repo MyAshPhoenixApp.Repo
  end

  code_interface do
    define :create, action: :create
    define :read_all, action: :read
    define :update, action: :update
    define :destroy, action: :destroy
    define :get_by_id, args: [:id], action: :by_id
  end

  actions do
    # Exposes default built in actions to manage the resource
    defaults [:read, :destroy]

    create :create do
      # accept name as input
      accept [:name]
    end

    update :update do
      # accept name as input
      accept [:name]
    end

    read :by_id do
      argument :id, :uuid, allow_nil?: false
      get? true
      multitenancy :enforce 
      filter expr(id == ^arg(:id))
    end
  end

  attributes do
    uuid_primary_key :id

    attribute :name, :string do
      allow_nil? false
    end

    timestamps()
  end

  relationships do
    belongs_to :organization, MyAshPhoenixApp.Client.Organization
  end
end

making this change allowed me to return the "domain" in the Repo.all_tenants call.