def pb_to_entity(self, pb):
kind = None
if pb.has_key():
# TODO: Fix the inefficiency here: we extract the key just so we
# can get the kind just so we can find the intended model class,
# but the key is extracted again and stored in the entity by FromPb().
key = Key(reference=pb.key())
kind = key.kind()
modelclass = Model._kind_map.get(kind, self.default_model)
if modelclass is None:
raise KindError("No implementation found for kind '%s'" % kind)
ent = modelclass()
ent.FromPb(pb)
return ent
def default_memcache_timeout_policy(key):
"""Default memcache timeout policy.
This defers to _memcache_timeout on the Model class.
Args:
key: Key instance.
Returns:
Memcache timeout to use (integer), or None.
"""
timeout = None
if key is not None:
modelclass = model.Model._kind_map.get(key.kind())
if modelclass is not None:
policy = getattr(modelclass, '_memcache_timeout', None)
if policy is not None:
if isinstance(policy, (int, long)):
timeout = policy
else:
timeout = policy(key)
return timeout
def default_datastore_policy(key):
"""Default datastore policy.
This defers to _use_datastore on the Model class.
Args:
key: Key instance.
Returns:
A bool or None.
"""
flag = None
if key is not None:
modelclass = model.Model._kind_map.get(key.kind())
if modelclass is not None:
policy = getattr(modelclass, '_use_datastore', None)
if policy is not None:
if isinstance(policy, bool):
flag = policy
else:
flag = policy(key)
return flag