60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
from django.db import models
|
|
|
|
class Poll(models.Model):
|
|
question = models.CharField(max_length=200)
|
|
|
|
def __unicode__(self):
|
|
return u"Q: %s " % self.question
|
|
|
|
class Choice(models.Model):
|
|
poll = models.ForeignKey(Poll)
|
|
choice = models.CharField(max_length=200)
|
|
|
|
def __unicode__(self):
|
|
return u"Choice: %s in poll %s" % (self.choice, self.poll)
|
|
|
|
__test__ = {'API_TESTS':"""
|
|
# Regression test for the use of None as a query value. None is interpreted as
|
|
# an SQL NULL, but only in __exact queries.
|
|
# Set up some initial polls and choices
|
|
>>> p1 = Poll(question='Why?')
|
|
>>> p1.save()
|
|
>>> c1 = Choice(poll=p1, choice='Because.')
|
|
>>> c1.save()
|
|
>>> c2 = Choice(poll=p1, choice='Why Not?')
|
|
>>> c2.save()
|
|
|
|
# Exact query with value None returns nothing ("is NULL" in sql, but every 'id'
|
|
# field has a value).
|
|
>>> Choice.objects.filter(choice__exact=None)
|
|
[]
|
|
|
|
Excluding the previous result returns everything.
|
|
>>> Choice.objects.exclude(choice=None).order_by('id')
|
|
[<Choice: Choice: Because. in poll Q: Why? >, <Choice: Choice: Why Not? in poll Q: Why? >]
|
|
|
|
# Valid query, but fails because foo isn't a keyword
|
|
>>> Choice.objects.filter(foo__exact=None)
|
|
Traceback (most recent call last):
|
|
...
|
|
FieldError: Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll
|
|
|
|
# Can't use None on anything other than __exact
|
|
>>> Choice.objects.filter(id__gt=None)
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Cannot use None as a query value
|
|
|
|
# Can't use None on anything other than __exact
|
|
>>> Choice.objects.filter(foo__gt=None)
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Cannot use None as a query value
|
|
|
|
# Related managers use __exact=None implicitly if the object hasn't been saved.
|
|
>>> p2 = Poll(question="How?")
|
|
>>> p2.choice_set.all()
|
|
[]
|
|
|
|
"""}
|