* improvement: add data layer introspection to Ash.Resource.Info (#610)

---------

Co-authored-by: Daniel Stewart <[email protected]>

.gitignore

@@ -35,3 +35,4 @@ shell.nix
 .DS_Store
 
 .vscode
+.elixir-tools

lib/ash/data_layer/data_layer.ex

@@ -224,7 +224,7 @@ defmodule Ash.DataLayer do
                       set_tenant: 3
 
   @doc "The data layer of the resource, or nil if it does not have one"
-  @spec data_layer(Ash.Resource.t() | Spark.Dsl.t()) :: Ash.DataLayer.t()
+  @spec data_layer(Ash.Resource.t() | Spark.Dsl.t()) :: Ash.DataLayer.t() | nil
   def data_layer(resource) do
     Extension.get_persisted(resource, :data_layer)
   end

lib/ash/resource/info.ex

@@ -721,4 +721,8 @@ defmodule Ash.Resource.Info do
         true
     end
   end
+
+  @doc "The data layer of the resource, or nil if it does not have one"
+  @spec data_layer(Ash.Resource.t()) :: Ash.DataLayer.t() | nil
+  defdelegate data_layer(resource), to: Ash.DataLayer
 end

test/resource/info_test.exs

@@ -151,5 +151,9 @@ defmodule Ash.Test.Resource.InfoTest do
       assert false == Info.sortable?(Comment, :post_authors)
       assert false == Info.sortable?(Comment, :formatted_post_title, pagination_type: :keyset)
     end
+
+    test "get datalayer from resource" do
+      assert Ash.DataLayer.Ets == Info.data_layer(Post)
+    end
   end
 end