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-rw-r--r--activerecord/test/cases/associations/belongs_to_associations_test.rb12
1 files changed, 12 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/belongs_to_associations_test.rb b/activerecord/test/cases/associations/belongs_to_associations_test.rb
index 6dcbbc7e34..f97f89b6fe 100644
--- a/activerecord/test/cases/associations/belongs_to_associations_test.rb
+++ b/activerecord/test/cases/associations/belongs_to_associations_test.rb
@@ -567,4 +567,16 @@ class BelongsToAssociationsTest < ActiveRecord::TestCase
client.client_of = companies(:first_firm).id
assert_equal companies(:first_firm), firm.reload
end
+
+ def test_polymorphic_counter_cache
+ tagging = taggings(:welcome_general)
+ post = posts(:welcome)
+ comment = comments(:greetings)
+
+ assert_difference 'post.reload.taggings_count', -1 do
+ assert_difference 'comment.reload.taggings_count', +1 do
+ tagging.taggable = comment
+ end
+ end
+ end
end