mirror of
https://github.com/django/django.git
synced 2024-12-26 19:16:11 +00:00
966f652464
git-svn-id: http://code.djangoproject.com/svn/django/trunk@9519 bcc190cf-cafb-0310-a4f2-bffc1f526a37
79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
"""
|
|
Tests for the order_with_respect_to Meta attribute.
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
class Question(models.Model):
|
|
text = models.CharField(max_length=200)
|
|
|
|
class Answer(models.Model):
|
|
text = models.CharField(max_length=200)
|
|
question = models.ForeignKey(Question)
|
|
|
|
class Meta:
|
|
order_with_respect_to = 'question'
|
|
|
|
def __unicode__(self):
|
|
return unicode(self.text)
|
|
|
|
__test__ = {'API_TESTS': """
|
|
>>> q1 = Question(text="Which Beatle starts with the letter 'R'?")
|
|
>>> q1.save()
|
|
>>> q2 = Question(text="What is your name?")
|
|
>>> q2.save()
|
|
>>> Answer(text="John", question=q1).save()
|
|
>>> Answer(text="Jonno",question=q2).save()
|
|
>>> Answer(text="Paul", question=q1).save()
|
|
>>> Answer(text="Paulo", question=q2).save()
|
|
>>> Answer(text="George", question=q1).save()
|
|
>>> Answer(text="Ringo", question=q1).save()
|
|
|
|
The answers will always be ordered in the order they were inserted.
|
|
|
|
>>> q1.answer_set.all()
|
|
[<Answer: John>, <Answer: Paul>, <Answer: George>, <Answer: Ringo>]
|
|
|
|
We can retrieve the answers related to a particular object, in the order
|
|
they were created, once we have a particular object.
|
|
|
|
>>> a1 = Answer.objects.filter(question=q1)[0]
|
|
>>> a1
|
|
<Answer: John>
|
|
>>> a2 = a1.get_next_in_order()
|
|
>>> a2
|
|
<Answer: Paul>
|
|
>>> a4 = list(Answer.objects.filter(question=q1))[-1]
|
|
>>> a4
|
|
<Answer: Ringo>
|
|
>>> a4.get_previous_in_order()
|
|
<Answer: George>
|
|
|
|
Determining (and setting) the ordering for a particular item is also possible.
|
|
|
|
>>> id_list = [o.pk for o in q1.answer_set.all()]
|
|
>>> a2.question.get_answer_order() == id_list
|
|
True
|
|
|
|
>>> a5 = Answer(text="Number five", question=q1)
|
|
>>> a5.save()
|
|
|
|
It doesn't matter which answer we use to check the order, it will always be the same.
|
|
|
|
>>> a2.question.get_answer_order() == a5.question.get_answer_order()
|
|
True
|
|
|
|
The ordering can be altered:
|
|
|
|
>>> id_list = [o.pk for o in q1.answer_set.all()]
|
|
>>> x = id_list.pop()
|
|
>>> id_list.insert(-1, x)
|
|
>>> a5.question.get_answer_order() == id_list
|
|
False
|
|
>>> a5.question.set_answer_order(id_list)
|
|
>>> q1.answer_set.all()
|
|
[<Answer: John>, <Answer: Paul>, <Answer: George>, <Answer: Number five>, <Answer: Ringo>]
|
|
|
|
"""
|
|
}
|