2 files changed, 1 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/associations/join_dependency.rb b/activerecord/lib/active_record/associations/join_dependency.rb
index b3fec5ae0c..6e08f67286 100644
--- a/activerecord/lib/active_record/associations/join_dependency.rb
+++ b/activerecord/lib/active_record/associations/join_dependency.rb
@@ -80,7 +80,7 @@ module ActiveRecord
       end
 
       def join_constraints
-        join_root.flat_map(&:join_constraints)
+        join_root.children.flat_map { |c| c.flat_map(&:join_constraints) }
       end
 
       def columns
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_part.rb b/activerecord/lib/active_record/associations/join_dependency/join_part.rb
index 0bd47a3646..fbc6199f87 100644
--- a/activerecord/lib/active_record/associations/join_dependency/join_part.rb
+++ b/activerecord/lib/active_record/associations/join_dependency/join_part.rb
@@ -29,9 +29,6 @@ module ActiveRecord
           @children = []
         end
 
-        def join_constraints; []; end
-        def join_relation(rel); rel; end
-
         def name
           reflection.name
         end