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-rw-r--r--activerecord/lib/active_record/associations/preloader/through_association.rb5
1 files changed, 0 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/through_association.rb b/activerecord/lib/active_record/associations/preloader/through_association.rb
index 30558ae29c..ad6374d09a 100644
--- a/activerecord/lib/active_record/associations/preloader/through_association.rb
+++ b/activerecord/lib/active_record/associations/preloader/through_association.rb
@@ -33,13 +33,8 @@ module ActiveRecord
through_options
).run
- # TODO: Verify that this is actually necessary and not just a symptom of an
- # underlying inefficiency
- identity_map = {}
-
Hash[owners.map do |owner|
through_records = Array.wrap(owner.send(through_reflection.name))
- through_records.map! { |record| identity_map[record] ||= record }
# Dont cache the association - we would only be caching a subset
if reflection.options[:source_type] && through_reflection.collection?