fix: fix id_or_name property of key class (#115)

* fix: fix id_or_name property of key class * fix: unit test added

Author: HemangChothani

google/cloud/datastore/key.py

@@ -441,7 +441,9 @@ def id_or_name(self):
  :returns: The last element of the key's path if it is either an ``id``
  or a ``name``.
  """
- return self.id or self.name
+ if self.id is None:
+ return self.name
+ return self.id
 
  @property
  def project(self):

tests/unit/test_key.py

@@ -488,6 +488,11 @@ def test_id_or_name_w_name_only(self):
  key = self._make_one("KIND", _NAME, project=self._DEFAULT_PROJECT)
  self.assertEqual(key.id_or_name, _NAME)
 
+ def test_id_or_name_w_id_zero(self):
+ _ID = 0
+ key = self._make_one("KIND", _ID, project=self._DEFAULT_PROJECT)
+ self.assertEqual(key.id_or_name, _ID)
+
  def test_parent_default(self):
  key = self._make_one("KIND", project=self._DEFAULT_PROJECT)
  self.assertIsNone(key.parent)