1 files changed, 6 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/eager_test.rb b/activerecord/test/cases/associations/eager_test.rb
index 42a891bc3b..79e5ecf4ce 100644
--- a/activerecord/test/cases/associations/eager_test.rb
+++ b/activerecord/test/cases/associations/eager_test.rb
@@ -833,4 +833,10 @@ class EagerAssociationTest < ActiveRecord::TestCase
     end
   end
 
+  def test_preloading_empty_polymorphic_parent
+    t = Tagging.create!(:taggable_type => 'Post', :taggable_id => Post.maximum(:id) + 1, :tag => tags(:general))
+
+    assert_queries(2) { @tagging = Tagging.preload(:taggable).find(t.id) }
+    assert_no_queries { assert ! @tagging.taggable }
+  end
 end