diff options
| -rw-r--r-- | activerecord/lib/active_record/associations/join_dependency/join_part.rb | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_part.rb b/activerecord/lib/active_record/associations/join_dependency/join_part.rb index b534569063..f70e277c76 100644 --- a/activerecord/lib/active_record/associations/join_dependency/join_part.rb +++ b/activerecord/lib/active_record/associations/join_dependency/join_part.rb @@ -62,7 +62,19 @@ module ActiveRecord end def extract_record(row) - Hash[column_names_with_alias.map{|cn, an| [cn, row[an]]}] + # This code is performance critical as it is called per row. + # see: https://github.com/rails/rails/pull/12185 + hash = {} + + index = 0 + length = column_names_with_alias.length + while index < length + column_name,alias_name = column_names_with_alias[index] + hash[column_name] = row[alias_name] + index += 1 + end + + hash end def record_id(row) |