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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 8e50f4a9bc..6660df302b 100644
--- a/activerecord/lib/active_record/relation/query_methods.rb
+++ b/activerecord/lib/active_record/relation/query_methods.rb
@@ -282,7 +282,7 @@ module ActiveRecord
association.join_to(manager)
end
- manager.join_sources.concat join_nodes
+ manager.join_sources.concat join_nodes.uniq
manager.join_sources.concat join_list
manager