diff options
| -rw-r--r-- | activerecord/lib/active_record/collection_cache_key.rb | 4 | ||||
| -rw-r--r-- | activerecord/test/cases/collection_cache_key_test.rb | 8 |
2 files changed, 11 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/collection_cache_key.rb b/activerecord/lib/active_record/collection_cache_key.rb index 3c4ca3d116..b0e555038e 100644 --- a/activerecord/lib/active_record/collection_cache_key.rb +++ b/activerecord/lib/active_record/collection_cache_key.rb @@ -7,7 +7,9 @@ module ActiveRecord if collection.loaded? size = collection.size - timestamp = collection.max_by(×tamp_column).public_send(timestamp_column) + if size > 0 + timestamp = collection.max_by(×tamp_column).public_send(timestamp_column) + end else column_type = type_for_attribute(timestamp_column.to_s) column = "#{connection.quote_table_name(collection.table_name)}.#{connection.quote_column_name(timestamp_column)}" diff --git a/activerecord/test/cases/collection_cache_key_test.rb b/activerecord/test/cases/collection_cache_key_test.rb index 53058c5a4a..93e7b9cff6 100644 --- a/activerecord/test/cases/collection_cache_key_test.rb +++ b/activerecord/test/cases/collection_cache_key_test.rb @@ -66,5 +66,13 @@ module ActiveRecord developers = projects(:active_record).developers assert_match(/\Adevelopers\/query-(\h+)-(\d+)-(\d+)\Z/, developers.cache_key) end + + test "cache_key for loaded collection with zero size" do + Comment.delete_all + posts = Post.includes(:comments) + empty_loaded_collection = posts.first.comments + + assert_match(/\Acomments\/query-(\h+)-0\Z/, empty_loaded_collection.cache_key) + end end end |