test: unions test case for primitive subtype (#203)

test/auto_form_test.exs

@@ -2,7 +2,7 @@ defmodule AshPhoenix.AutoFormTest do
   use ExUnit.Case
 
   alias AshPhoenix.Form.Auto
-  alias AshPhoenix.Test.{Domain, Post}
+  alias AshPhoenix.Test.{Domain, Post, SimplePost}
   import AshPhoenix.Form, only: [update_opts: 2]
 
   defp form_for(a, _b), do: Phoenix.HTML.FormData.to_form(a, [])
@@ -98,6 +98,21 @@ defmodule AshPhoenix.AutoFormTest do
       |> AshPhoenix.Form.submit!()
     end
 
+    test "simple unions" do
+      SimplePost
+      |> AshPhoenix.Form.for_create(:create,
+        domain: Domain,
+        forms: [
+          auto?: true
+        ],
+        params: %{
+          "text" => "foobar"
+        }
+      )
+      |> AshPhoenix.Form.add_form(:union, params: %{"type" => "custom"})
+      |> AshPhoenix.Form.submit!()
+    end
+
     test "deeply nested unions" do
       # AshPhoenix.Test.DeepNestedUnionResource
       # |> AshPhoenix.Form.for_create(:create,

test/support/domain.ex

@@ -11,5 +11,6 @@ defmodule AshPhoenix.Test.Domain do
     resource(AshPhoenix.Test.PostWithDefault)
     resource(AshPhoenix.Test.User)
     resource(AshPhoenix.Test.DeepNestedUnionResource)
+    resource(AshPhoenix.Test.SimplePost)
   end
 end

test/support/resources/simple_post.ex

@@ -0,0 +1,41 @@
+defmodule AshPhoenix.Test.SimplePost.SimpleUnion do
+  use Ash.Type.NewType,
+    subtype_of: :union,
+    constraints: [
+      types: [
+        predefined: [
+          type: :atom,
+          constraints: [one_of: [:update]],
+          tag: :type,
+          tag_value: :predefined,
+          cast_tag?: true
+        ],
+        custom: [
+          type: :string,
+          tag: :type,
+          tag_value: :custom,
+          cast_tag?: true
+        ]
+      ]
+    ]
+end
+
+defmodule AshPhoenix.Test.SimplePost do
+  use Ash.Resource,
+    domain: AshPhoenix.Test.Domain,
+    data_layer: Ash.DataLayer.Ets
+
+  ets do
+    private?(true)
+  end
+
+  attributes do
+    uuid_primary_key(:id, public?: true)
+    attribute(:union, AshPhoenix.Test.SimplePost.SimpleUnion, public?: true)
+  end
+
+  actions do
+    default_accept(:*)
+    defaults([:create])
+  end
+end