1 files changed, 20 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/join_model_test.rb b/activerecord/test/cases/associations/join_model_test.rb
index c2f8f1ca8c..783b83631c 100644
--- a/activerecord/test/cases/associations/join_model_test.rb
+++ b/activerecord/test/cases/associations/join_model_test.rb
@@ -581,6 +581,26 @@ class AssociationsJoinModelTest < ActiveRecord::TestCase
     assert_raise(ActiveRecord::AssociationTypeMismatch) { posts(:thinking).tags.delete(Object.new) }
   end
 
+  def test_deleting_by_fixnum_id_from_has_many_through
+    post = posts(:thinking)
+
+    assert_difference 'post.tags.count', -1 do
+      assert_equal 1, post.tags.delete(1).size
+    end
+
+    assert_equal 0, post.tags.size
+  end
+
+  def test_deleting_by_string_id_from_has_many_through
+    post = posts(:thinking)
+
+    assert_difference 'post.tags.count', -1 do
+      assert_equal 1, post.tags.delete('1').size
+    end
+
+    assert_equal 0, post.tags.size
+  end
+
   def test_has_many_through_sum_uses_calculations
     assert_nothing_raised { authors(:david).comments.sum(:post_id) }
   end