--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/modeltests/order_with_respect_to/tests.py Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,71 @@
+from operator import attrgetter
+
+from django.test import TestCase
+
+from models import Post, Question, Answer
+
+
+class OrderWithRespectToTests(TestCase):
+ def test_basic(self):
+ q1 = Question.objects.create(text="Which Beatle starts with the letter 'R'?")
+ q2 = Question.objects.create(text="What is your name?")
+
+ Answer.objects.create(text="John", question=q1)
+ Answer.objects.create(text="Jonno", question=q2)
+ Answer.objects.create(text="Paul", question=q1)
+ Answer.objects.create(text="Paulo", question=q2)
+ Answer.objects.create(text="George", question=q1)
+ Answer.objects.create(text="Ringo", question=q1)
+
+ # The answers will always be ordered in the order they were inserted.
+ self.assertQuerysetEqual(
+ q1.answer_set.all(), [
+ "John", "Paul", "George", "Ringo",
+ ],
+ attrgetter("text"),
+ )
+
+ # 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]
+ self.assertEqual(a1.text, "John")
+ a2 = a1.get_next_in_order()
+ self.assertEqual(a2.text, "Paul")
+ a4 = list(Answer.objects.filter(question=q1))[-1]
+ self.assertEqual(a4.text, "Ringo")
+ self.assertEqual(a4.get_previous_in_order().text, "George")
+
+ # Determining (and setting) the ordering for a particular item is also
+ # possible.
+ id_list = [o.pk for o in q1.answer_set.all()]
+ self.assertEqual(a2.question.get_answer_order(), id_list)
+
+ a5 = Answer.objects.create(text="Number five", question=q1)
+
+ # It doesn't matter which answer we use to check the order, it will
+ # always be the same.
+ self.assertEqual(
+ a2.question.get_answer_order(), a5.question.get_answer_order()
+ )
+
+ # 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)
+ self.assertNotEqual(a5.question.get_answer_order(), id_list)
+ a5.question.set_answer_order(id_list)
+ self.assertQuerysetEqual(
+ q1.answer_set.all(), [
+ "John", "Paul", "George", "Number five", "Ringo"
+ ],
+ attrgetter("text")
+ )
+
+ def test_recursive_ordering(self):
+ p1 = Post.objects.create(title='1')
+ p2 = Post.objects.create(title='2')
+ p1_1 = Post.objects.create(title="1.1", parent=p1)
+ p1_2 = Post.objects.create(title="1.2", parent=p1)
+ p2_1 = Post.objects.create(title="2.1", parent=p2)
+ p1_3 = Post.objects.create(title="1.3", parent=p1)
+ self.assertEqual(p1.get_post_order(), [p1_1.pk, p1_2.pk, p1_3.pk])