def add_member_to_team(self, request):
     if request.mail is None:
         raise endpoints.BadRequestException(message="User's email is mandatory")
     team = Team.get_by_id(request.team_id, parent=ndb.Key(Organisation, request.code_organisation))
     if team is None:
         raise endpoints.BadRequestException(message="No such team")
     team.users_mail.append(request.mail)
     team.put()
     return OrganisationConverter().convert_team(team)