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from __future__ import absolute_import
from operator import attrgetter
from django.test import TestCase
from .models import Person
class RecursiveM2MTests(TestCase):
def test_recursive_m2m(self):
a, b, c, d = [
Person.objects.create(name=name)
for name in ["Anne", "Bill", "Chuck", "David"]
]
# Add some friends in the direction of field definition
# Anne is friends with Bill and Chuck
a.friends.add(b, c)
# David is friends with Anne and Chuck - add in reverse direction
d.friends.add(a,c)
# Who is friends with Anne?
self.assertQuerysetEqual(
a.friends.all(), [
"Bill",
"Chuck",
"David"
],
attrgetter("name")
)
# Who is friends with Bill?
self.assertQuerysetEqual(
b.friends.all(), [
"Anne",
],
attrgetter("name")
)
# Who is friends with Chuck?
self.assertQuerysetEqual(
c.friends.all(), [
"Anne",
"David"
],
attrgetter("name")
)
# Who is friends with David?
self.assertQuerysetEqual(
d.friends.all(), [
"Anne",
"Chuck",
],
attrgetter("name")
)
# Bill is already friends with Anne - add Anne again, but in the
# reverse direction
b.friends.add(a)
# Who is friends with Anne?
self.assertQuerysetEqual(
a.friends.all(), [
"Bill",
"Chuck",
"David",
],
attrgetter("name")
)
# Who is friends with Bill?
self.assertQuerysetEqual(
b.friends.all(), [
"Anne",
],
attrgetter("name")
)
# Remove Anne from Bill's friends
b.friends.remove(a)
# Who is friends with Anne?
self.assertQuerysetEqual(
a.friends.all(), [
"Chuck",
"David",
],
attrgetter("name")
)
# Who is friends with Bill?
self.assertQuerysetEqual(
b.friends.all(), []
)
# Clear Anne's group of friends
a.friends.clear()
# Who is friends with Anne?
self.assertQuerysetEqual(
a.friends.all(), []
)
# Reverse relationships should also be gone
# Who is friends with Chuck?
self.assertQuerysetEqual(
c.friends.all(), [
"David",
],
attrgetter("name")
)
# Who is friends with David?
self.assertQuerysetEqual(
d.friends.all(), [
"Chuck",
],
attrgetter("name")
)
# Add some idols in the direction of field definition
# Anne idolizes Bill and Chuck
a.idols.add(b, c)
# Bill idolizes Anne right back
b.idols.add(a)
# David is idolized by Anne and Chuck - add in reverse direction
d.stalkers.add(a, c)
# Who are Anne's idols?
self.assertQuerysetEqual(
a.idols.all(), [
"Bill",
"Chuck",
"David",
],
attrgetter("name")
)
# Who is stalking Anne?
self.assertQuerysetEqual(
a.stalkers.all(), [
"Bill",
],
attrgetter("name")
)
# Who are Bill's idols?
self.assertQuerysetEqual(
b.idols.all(), [
"Anne",
],
attrgetter("name")
)
# Who is stalking Bill?
self.assertQuerysetEqual(
b.stalkers.all(), [
"Anne",
],
attrgetter("name")
)
# Who are Chuck's idols?
self.assertQuerysetEqual(
c.idols.all(), [
"David",
],
attrgetter("name"),
)
# Who is stalking Chuck?
self.assertQuerysetEqual(
c.stalkers.all(), [
"Anne",
],
attrgetter("name")
)
# Who are David's idols?
self.assertQuerysetEqual(
d.idols.all(), []
)
# Who is stalking David
self.assertQuerysetEqual(
d.stalkers.all(), [
"Anne",
"Chuck",
],
attrgetter("name")
)
# Bill is already being stalked by Anne - add Anne again, but in the
# reverse direction
b.stalkers.add(a)
# Who are Anne's idols?
self.assertQuerysetEqual(
a.idols.all(), [
"Bill",
"Chuck",
"David",
],
attrgetter("name")
)
# Who is stalking Anne?
self.assertQuerysetEqual(
a.stalkers.all(), [
"Bill",
],
attrgetter("name")
)
# Who are Bill's idols
self.assertQuerysetEqual(
b.idols.all(), [
"Anne",
],
attrgetter("name")
)
# Who is stalking Bill?
self.assertQuerysetEqual(
b.stalkers.all(), [
"Anne",
],
attrgetter("name"),
)
# Remove Anne from Bill's list of stalkers
b.stalkers.remove(a)
# Who are Anne's idols?
self.assertQuerysetEqual(
a.idols.all(), [
"Chuck",
"David",
],
attrgetter("name")
)
# Who is stalking Anne?
self.assertQuerysetEqual(
a.stalkers.all(), [
"Bill",
],
attrgetter("name")
)
# Who are Bill's idols?
self.assertQuerysetEqual(
b.idols.all(), [
"Anne",
],
attrgetter("name")
)
# Who is stalking Bill?
self.assertQuerysetEqual(
b.stalkers.all(), []
)
# Clear Anne's group of idols
a.idols.clear()
# Who are Anne's idols
self.assertQuerysetEqual(
a.idols.all(), []
)
# Reverse relationships should also be gone
# Who is stalking Chuck?
self.assertQuerysetEqual(
c.stalkers.all(), []
)
# Who is friends with David?
self.assertQuerysetEqual(
d.stalkers.all(), [
"Chuck",
],
attrgetter("name")
)
|
