ask reflection for klass join reflection

1 files changed, 15 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index 02aab25610..ba40db2de9 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -196,6 +196,21 @@ module ActiveRecord
         end
       end
 
+      def klass_join_scope(table, predicate_builder) # :nodoc:
+        if klass.current_scope
+          klass.current_scope.clone.tap { |scope|
+            scope.joins_values = []
+          }
+        else
+          relation = ActiveRecord::Relation.create(
+            klass,
+            table,
+            predicate_builder,
+          )
+          klass.send(:build_default_scope, relation)
+        end
+      end
+
       def constraints
         chain.map(&:scopes).flatten
       end