Example of data-layer-less resources

example.ex

defmodule Greeting do
  use Ash.Resource
  # This resource has no struct representation
  # and simply contains the action.
  # What makes this better than a function?
  # https://hexdocs.pm/ash/generic-actions.html#why-use-generic-actions
  
  actions do
    action :say_hello, :string do
      argument :to, :string, allow_nil?: false
      
      run fn input, _ -> 
        {:ok, "Helo, #{input.arguments.to}"}
      end
    end
  end
end

defmodule MyApp.Ticket do
  use Ash.Resource
  
  # This resource has a struct representation but no data layer
  # In this case, it works with external data
  
  actions do
    create :create do
      accept [:title, :priority]
      
      manual fn changeset, _ ->
        with {:ok, data} <- Ash.Changeset.apply_attributes(changeset),
             {:ok, result} <- SomeExternalService.create(data.title, data.priority) do
          {:ok, struct(__MODULE__, id: result.id, title: result.title, priority: result.priority)}
        end
      end
    end
  end
  
  attributes do
    integer_primary_key :id
    attribute :title, :string, allow_nil?: false
    attribute :priority, :integer, allow_nil?: false
  end
end