def _CalculateScore(self):
# NOTE: Since the 'score' property is a ComputedProperty, it will
# be re-computed before every put. Consequently, when a Blockable is put for
# the first time, we won't see a pre-existing value for 'score'. Here, we
# avoid the score calculation for newly-created Blockables as they shouldn't
# have any Votes associated with them and, thus, should have a score of 0.
if not datastore_utils.HasValue(self, 'score'):
return 0
tally = 0
votes = self.GetVotes()
for vote in votes:
if vote.was_yes_vote:
tally += vote.weight
else:
tally -= vote.weight
return tally
def testHasValue(self):
class Foo(ndb.Model):
a = ndb.ComputedProperty(lambda self: 'a')
b = ndb.StringProperty()
foo = Foo()
self.assertFalse(datastore_utils.HasValue(foo, 'a'))
self.assertFalse(datastore_utils.HasValue(foo, 'b'))
foo.b = 'b'
self.assertFalse(datastore_utils.HasValue(foo, 'a'))
self.assertTrue(datastore_utils.HasValue(foo, 'b'))
foo.put()
self.assertTrue(datastore_utils.HasValue(foo, 'a'))
self.assertTrue(datastore_utils.HasValue(foo, 'b'))