Include user defined attributes in inspect

The fact that this only includes column names is an oversight.

1 files changed, 6 insertions, 0 deletions

diff --git a/activerecord/test/cases/attributes_test.rb b/activerecord/test/cases/attributes_test.rb
index 7ec1f6f18c..c18851257e 100644
--- a/activerecord/test/cases/attributes_test.rb
+++ b/activerecord/test/cases/attributes_test.rb
@@ -249,5 +249,11 @@ module ActiveRecord
       model.foo = "lol"
       refute model.changed?
     end
+
+    test "attributes not backed by database columns appear in inspect" do
+      inspection = OverloadedType.new.inspect
+
+      assert inspection.include?("non_existent_decimal")
+    end
   end
 end