diff options
Diffstat (limited to 'activerecord/lib')
| -rw-r--r-- | activerecord/lib/active_record/associations/preloader/through_association.rb | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/through_association.rb b/activerecord/lib/active_record/associations/preloader/through_association.rb index fa32cc5553..5bd49b041a 100644 --- a/activerecord/lib/active_record/associations/preloader/through_association.rb +++ b/activerecord/lib/active_record/associations/preloader/through_association.rb @@ -13,18 +13,30 @@ module ActiveRecord end def associated_records_by_owner(preloader) + already_loaded = owners.first.association(through_reflection.name).loaded? through_scope = through_scope() - preloader.preload(owners, - through_reflection.name, - through_scope) + unless already_loaded + preloader.preload(owners, through_reflection.name, through_scope) + end through_records = owners.map do |owner| center = owner.association(through_reflection.name).target [owner, Array(center)] end - reset_association(owners, through_reflection.name, through_scope) + if already_loaded + if source_type = reflection.options[:source_type] + through_records.map! do |owner, center| + center = center.select do |record| + record[reflection.foreign_type] == source_type + end + [owner, center] + end + end + else + reset_association(owners, through_reflection.name, through_scope) + end middle_records = through_records.flat_map(&:last) |