If you have not yet seen the source in basic, please take a look.


In this sample we add an additional method MyModelGet which allows a specific entity to be retrieved.

from google.appengine.ext import endpoints
from google.appengine.ext import ndb
from protorpc import remote

from endpoints_proto_datastore.ndb import EndpointsModel

In this model definition, we have included _message_fields_schema to define a custom ProtoRPC message schema for this model. To see a similar but different way to use custom fields, check out the samples in custom_api_response_messages and paging.

class MyModel(EndpointsModel):

This results in a ProtoRPC message definition with four fields, in the exact order specified here: id, attr1, attr2, and created. The fields corresponding to properties (attr1, attr2, and created) are string fields as in basic. The field id will be an integer field representing the ID of the entity in the datastore. For example if my_entity.key is equal to ndb.Key(MyModel, 1), the id is the integer 1.

The property id is one of five helper properties provided by default to help you perform common operations like this (retrieving by ID). In addition there is an entityKey property which provides a base64 encoded version of a datastore key and can be used in a similar fashion as id, and three properties used for queries — limit, order, pageToken — which are described in more detail in paging.

  _message_fields_schema = ('id', 'attr1', 'attr2', 'created')
  attr1 = ndb.StringProperty()
  attr2 = ndb.StringProperty()
  created = ndb.DateTimeProperty(auto_now_add=True)

@endpoints.api(name='myapi', version='v1', description='My Little API')
class MyApi(remote.Service):

  @MyModel.method(path='mymodel', http_method='POST', name='mymodel.insert')
  def MyModelInsert(self, my_model):

Here, since the schema includes an ID, it is possible that the entity my_model has an ID, hence we could be specifying a new ID in the datastore or overwriting an existing entity. If no ID is included in the ProtoRPC request, then no key will be set in the model and the ID will be set after the put completes, as in basic.

In either case, the datastore ID from the entity will be returned in the ProtoRPC response message.

    return my_model

This method is not defined in any of the previous examples: it allows an entity to be retrieved from it's ID. As in custom_api_response_messages, we override the schema of the ProtoRPC request message to limit to a single field: id. Since id is one of the helper methods provided by EndpointsModel, we may use it as one of our request_fields. In general, other than these five, only properties you define are allowed.

                  path='mymodel/{id}', http_method='GET', name='mymodel.get')
  def MyModelGet(self, my_model):

Since the field id is included, when it is set from the ProtoRPC message, the decorator attempts to retrieve the entity by its ID. If the entity was retrieved, the boolean from_datastore on the entity will be True, otherwise it will be False. In this case, if the entity we attempted to retrieve was not found, we return an HTTP 404 Not Found.

    if not my_model.from_datastore:
      raise endpoints.NotFoundException('MyModel not found.')
    return my_model

This is identical to the example in basic, however since the ProtoRPC schema for the model now includes id, all the values in items will also contain an id.

  @MyModel.query_method(path='mymodels', name='mymodel.list')
  def MyModelList(self, query):
    return query
application = endpoints.api_server([MyApi], restricted=False)


For more details on the behavior of setting id, see the sample custom_alias_properties.