code: def to_array(self):
          
          array = super(PassportFile, self).to_array()
          array['file_id'] = u(self.file_id)  # py2: type unicode, py3: type str
          array['file_size'] = int(self.file_size)  # type int
          array['file_date'] = int(self.file_date)  # type int
          return array
docs: Serializes this PassportFile to a dictionary.
  
          :return: dictionary representation of this object.
          :rtype: dict