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-rw-r--r--activerecord/lib/active_record/relation/query_methods.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb
index cd6c6f8d1f..0bf0b37900 100644
--- a/activerecord/lib/active_record/relation/query_methods.rb
+++ b/activerecord/lib/active_record/relation/query_methods.rb
@@ -11,7 +11,7 @@ module ActiveRecord
def includes(*args)
args.reject! { |a| a.blank? }
- clone.tap {|r| r.includes_values += args if args.present? }
+ clone.tap {|r| r.includes_values = (r.includes_values + args).flatten.uniq if args.present? }
end
def eager_load(*args)