sqlalchemy.py 文件源码

def on_put(self, req, resp, *args, **kwargs):
        status_code = falcon.HTTP_OK
        try:
            with self.session_scope(self.db_engine) as db_session:
                obj = self.get_object(req, resp, kwargs, for_update=True, db_session=db_session)

                data = self.deserialize(req.context['doc'] if 'doc' in req.context else None)
                data, errors = self.clean(data)
                if errors:
                    result = {'errors': errors}
                    status_code = falcon.HTTP_BAD_REQUEST
                else:
                    result = self.update(req, resp, data, obj, db_session)
        except (IntegrityError, ProgrammingError) as err:
            # Cases such as unallowed NULL value should have been checked before we got here (e.g. validate against
            # schema using falconjsonio) - therefore assume this is a UNIQUE constraint violation
            if isinstance(err, IntegrityError) or err.orig.args[1] == self.VIOLATION_FOREIGN_KEY:
                raise HTTPConflict('Conflict', 'Unique constraint violated')
            else:
                raise

        self.render_response(result, req, resp, status_code)