association_scope_cache

# File activerecord/lib/active_record/reflection.rb, line 434
      def association_scope_cache(conn, owner)
        key = conn.prepared_statements
        if polymorphic?
          key = [key, owner._read_attribute(@foreign_type)]
        end
        @association_scope_cache[key] ||= @scope_lock.synchronize {
          @association_scope_cache[key] ||= yield
        }
      end