code: def set_query_attributes!
        attr_names = self.class.search_query_attributes.map(&:to_s)
        self.query = attr_names.inject({}) { |memo, attr|
          memo[attr] = self.send(attr)
          memo
        }
      end
docs: Build query attribute hash.
  
   Internally stored as JSONB.
  
   @return [Hash] to be set for query attribute