python - How to Clear/Invalidate NDB Cache in Tests -

i have simple ndb model instance attribute, not ndb property. want test property value gets lost when entity saved , retrieved datastore.

now when entity retrieved same instance 1 has been put datastore.

is there way programatically clear/invalidate memcache , ndb in-memory cache?

the example pytest test, sorry that.

from google.appengine.ext import testbed, ndb   class user(ndb.model):     name = ndb.textproperty()     foo = none   class testndbmodel(object):      def setup(self):         self.testbed = testbed.testbed()         self.testbed.activate()         self.testbed.init_datastore_v3_stub()         self.testbed.init_memcache_stub()      def teardown(self):         self.testbed.deactivate()      def test_foo(self):         user = user(name='andy')         assert user.name == 'andy'         assert user.foo none         user.foo = 123         assert user.foo == 123         user_key = user.put()          # here need clear cache somehow,         # entity must retrieved datastore          retrieved_user = user_key.get()          # these 2 fail         assert retrieved_user not user         assert retrieved_user.foo none 

you're apparently using wrong method assign value retrieved_user. use following instead:

retrieved_user = user_key.delete(use_datastore=false) 

see following link more information:

https://developers.google.com/appengine/docs/python/ndb/functions#context_options