test: add failing test for changing_attributes check for create (#288)

Author: vonagam

test/ash_postgres_test.exs

@@ -12,7 +12,15 @@ defmodule AshPostgresTest do
     }
   end
 
-  test "filter policies are applied" do
+  test "filter policies are applied in create" do
+    assert_raise Ash.Error.Forbidden, fn ->
+      AshPostgres.Test.Post
+      |> Ash.Changeset.for_create(:create, %{title: "worst"})
+      |> Ash.create!()
+    end
+  end
+
+  test "filter policies are applied in update" do
     post =
       AshPostgres.Test.Post
       |> Ash.Changeset.for_create(:create, %{title: "good"})

test/support/resources/post.ex

@@ -41,6 +41,10 @@ defmodule AshPostgres.Test.Post do
       authorize_if(relates_to_actor_via([:author, :authors_with_same_first_name]))
       authorize_unless(changing_attributes(title: [from: "good", to: "bad"]))
     end
+
+    policy action(:create) do
+      authorize_unless(changing_attributes(title: [to: "worst"]))
+    end
   end
 
   field_policies do