Only return invalid user id when it's the only error

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## v0.4.9 (TBA)
+
+### Enhancements
+
+* [`PowAssent.Ecto.UserIdentities.Context`] Changed `PowAssent.Ecto.UserIdentities.Context.create_user/4` to return `{:invalid_user_id_field, changeset}` when there is only error(s) on the user id field
+
 ## v0.4.8 (2020-05-18)
 
 ### Enhancements

lib/pow_assent/ecto/user_identities/context.ex

@@ -210,7 +210,7 @@ defmodule PowAssent.Ecto.UserIdentities.Context do
     |> user_mod.user_identity_changeset(params, user_params, user_id_params)
     |> Context.do_insert(config)
     |> user_user_identity_bound_different_user_error()
-    |> invalid_user_id_error(config)
+    |> maybe_invalid_user_id_error(config)
   end
 
   defp user_user_identity_bound_different_user_error({:error, %{changes: %{user_identities: [%{errors: errors}]}} = changeset}) do
@@ -228,16 +228,16 @@ defmodule PowAssent.Ecto.UserIdentities.Context do
     end)
   end
 
-  defp invalid_user_id_error({:error, %{errors: errors} = changeset}, config) do
+  defp maybe_invalid_user_id_error({:error, %{errors: errors} = changeset}, config) do
     user_mod      = user!(config)
     user_id_field = user_mod.pow_user_id_field()
 
-    Enum.find_value(errors, {:error, changeset}, fn
-      {^user_id_field, _error} -> {:error, {:invalid_user_id_field, changeset}}
-      _any                     -> false
-    end)
+    case Keyword.keys(errors) do
+      [^user_id_field] -> {:error, {:invalid_user_id_field, changeset}}
+      _any             -> {:error, changeset}
+    end
   end
-  defp invalid_user_id_error(any, _config), do: any
+  defp maybe_invalid_user_id_error(any, _config), do: any
 
   @doc """
   Deletes a user identity for the provider and user.

test/pow_assent/ecto/user_identities/context_test.exs

@@ -166,7 +166,23 @@ defmodule PowAssent.Ecto.UserIdentities.ContextTest do
     end
 
     test "when user id field is missing" do
-      assert {:error, {:invalid_user_id_field, _changeset}} =  Context.create_user(@user_identity_params, Map.delete(@user_params, :email), nil, @config)
+      user_params = Map.delete(@user_params, :email)
+
+      assert {:error, {:invalid_user_id_field, _changeset}} =  Context.create_user(@user_identity_params, user_params, nil, @config)
+
+      assert {:error, %Changeset{}} = Context.create_user(@user_identity_params, Map.delete(user_params, :name), nil, @config)
+    end
+
+    test "when user id field is invalid" do
+      user_params = Map.put(@user_params, :email, "invalid")
+
+      assert {:error, {:invalid_user_id_field, _changeset}} =  Context.create_user(@user_identity_params, user_params, nil, @config)
+
+      assert {:error, %Changeset{}} = Context.create_user(@user_identity_params, Map.delete(user_params, :name), nil, @config)
+    end
+
+    test "when user id field is invalid but also has other errors" do
+      assert {:error, _changeset} =  Context.create_user(@user_identity_params, Map.put(@user_params, :email, "invalid"), nil, @config)
     end
   end