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-rw-r--r--activerecord/lib/active_record/associations.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index 1dc094b893..9cd3b9662f 100644
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -1815,6 +1815,10 @@ module ActiveRecord
when Hash
associations.keys.each do |name|
reflection = base.reflections[name]
+
+ if records.any? && reflection.options && reflection.options[:uniq]
+ records.each { |record| record.send(reflection.name).target.uniq! }
+ end
parent_records = []
records.each do |record|