def _resource(self, resource_id):
"""Return the ``sandman2.model.Model`` instance with the given
*resource_id*.
:rtype: :class:`sandman2.model.Model`
"""
resource = self.__model__.query.get(resource_id)
if not resource:
raise NotFoundException()
return resource
def patch(self, resource_id):
"""Return an HTTP response object resulting from an HTTP PATCH call.
:returns: ``HTTP 200`` if the resource already exists
:returns: ``HTTP 400`` if the request is malformed
:returns: ``HTTP 404`` if the resource is not found
:param resource_id: The value of the resource's primary key
"""
resource = self._resource(resource_id)
if not resource:
raise NotFoundException()
error_message = is_valid_method(self.__model__, resource)
if error_message:
raise BadRequestException(error_message)
if not request.json:
raise BadRequestException('No JSON data received')
resource.update(request.json)
db.session().merge(resource)
db.session().commit()
return jsonify(resource)