Namespace is not set from Client if Model is set id.

[hhhhub000]

Environment details

1. Runtime: Python 3.7
2. Server: Google App Engine Standard Edition
3. ndb library: v1.0.1

Code example

client = ndb.Client(namespace="for_test")
...
with client.context():
        entity = AAAA(
            aaaa="aaaa"
        )
        user_key = entity.put() 

        entity = BBBB(
 　　    id="test",
            bbbb="bbbb"
        )
        user_key = entity.put() 

AAAA is created on "for_test" namespace.
But, BBBB is created on default namespace

I think namespace should be set from client. like following

mode.py

class Model(_NotEqualMixin):
....
        elif not key_parts_unspecified:
            self._key = Key(
                self._get_kind(),
                id_,
                parent=parent,
                project=project,
                namespace=namespace or client.namespace,
            )

[chrisrossi]

PR #339 fixes this issue. Thank you for the report!