swap_connection_handler

# File activerecord/lib/active_record/connection_handling.rb, line 390
      def swap_connection_handler(handler, &blk) # :nodoc:
        old_handler, ActiveRecord::Base.connection_handler = ActiveRecord::Base.connection_handler, handler
        return_value = yield
        return_value.load if return_value.is_a? ActiveRecord::Relation
        return_value
      ensure
        ActiveRecord::Base.connection_handler = old_handler
      end