182 lines
4.8 KiB
Python
182 lines
4.8 KiB
Python
from operator import attrgetter
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from django.test import TestCase
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from .models import Person
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class RecursiveM2MTests(TestCase):
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def setUp(self):
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self.a, self.b, self.c, self.d = [
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Person.objects.create(name=name)
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for name in ["Anne", "Bill", "Chuck", "David"]
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]
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# Anne is friends with Bill and Chuck
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self.a.friends.add(self.b, self.c)
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# David is friends with Anne and Chuck - add in reverse direction
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self.d.friends.add(self.a, self.c)
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def test_recursive_m2m_all(self):
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# Who is friends with Anne?
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self.assertQuerysetEqual(
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self.a.friends.all(), [
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"Bill",
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"Chuck",
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"David"
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],
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attrgetter("name"),
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ordered=False
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)
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# Who is friends with Bill?
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self.assertQuerysetEqual(
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self.b.friends.all(), [
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"Anne",
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],
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attrgetter("name")
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)
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# Who is friends with Chuck?
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self.assertQuerysetEqual(
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self.c.friends.all(), [
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"Anne",
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"David"
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],
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attrgetter("name"),
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ordered=False
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)
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# Who is friends with David?
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self.assertQuerysetEqual(
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self.d.friends.all(), [
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"Anne",
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"Chuck",
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],
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attrgetter("name"),
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ordered=False
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)
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def test_recursive_m2m_reverse_add(self):
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# Bill is already friends with Anne - add Anne again, but in the
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# reverse direction
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self.b.friends.add(self.a)
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# Who is friends with Anne?
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self.assertQuerysetEqual(
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self.a.friends.all(), [
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"Bill",
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"Chuck",
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"David",
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],
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attrgetter("name"),
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ordered=False
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)
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# Who is friends with Bill?
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self.assertQuerysetEqual(
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self.b.friends.all(), [
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"Anne",
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],
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attrgetter("name")
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)
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def test_recursive_m2m_remove(self):
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# Remove Anne from Bill's friends
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self.b.friends.remove(self.a)
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# Who is friends with Anne?
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self.assertQuerysetEqual(
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self.a.friends.all(), [
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"Chuck",
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"David",
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],
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attrgetter("name"),
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ordered=False
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)
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# Who is friends with Bill?
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self.assertQuerysetEqual(
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self.b.friends.all(), []
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)
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def test_recursive_m2m_clear(self):
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# Clear Anne's group of friends
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self.a.friends.clear()
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# Who is friends with Anne?
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self.assertQuerysetEqual(
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self.a.friends.all(), []
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)
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# Reverse relationships should also be gone
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# Who is friends with Chuck?
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self.assertQuerysetEqual(
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self.c.friends.all(), [
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"David",
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],
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attrgetter("name")
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)
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# Who is friends with David?
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self.assertQuerysetEqual(
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self.d.friends.all(), [
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"Chuck",
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],
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attrgetter("name")
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)
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def test_recursive_m2m_add_via_related_name(self):
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# David is idolized by Anne and Chuck - add in reverse direction
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self.d.stalkers.add(self.a)
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# Who are Anne's idols?
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self.assertQuerysetEqual(
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self.a.idols.all(), [
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"David",
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],
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attrgetter("name"),
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ordered=False
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)
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# Who is stalking Anne?
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self.assertQuerysetEqual(
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self.a.stalkers.all(), [],
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attrgetter("name")
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)
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def test_recursive_m2m_add_in_both_directions(self):
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"""Adding the same relation twice results in a single relation."""
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# Ann idolizes David
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self.a.idols.add(self.d)
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# David is idolized by Anne
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self.d.stalkers.add(self.a)
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# Who are Anne's idols?
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self.assertQuerysetEqual(
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self.a.idols.all(), [
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"David",
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],
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attrgetter("name"),
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ordered=False
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)
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# As the assertQuerysetEqual uses a set for comparison,
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# check we've only got David listed once
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self.assertEqual(self.a.idols.all().count(), 1)
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def test_recursive_m2m_related_to_self(self):
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# Ann idolizes herself
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self.a.idols.add(self.a)
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# Who are Anne's idols?
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self.assertQuerysetEqual(
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self.a.idols.all(), [
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"Anne",
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],
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attrgetter("name"),
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ordered=False
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)
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# Who is stalking Anne?
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self.assertQuerysetEqual(
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self.a.stalkers.all(), [
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"Anne",
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],
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attrgetter("name")
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)
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