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from django.core.exceptions import FieldError
from django.test import TestCase
from .models import Choice, Poll, User
class ReverseLookupTests(TestCase):
@classmethod
def setUpTestData(cls):
john = User.objects.create(name="John Doe")
jim = User.objects.create(name="Jim Bo")
first_poll = Poll.objects.create(
question="What's the first question?",
creator=john
)
second_poll = Poll.objects.create(
question="What's the second question?",
creator=jim
)
Choice.objects.create(
poll=first_poll,
related_poll=second_poll,
name="This is the answer."
)
def test_reverse_by_field(self):
u1 = User.objects.get(
poll__question__exact="What's the first question?"
)
self.assertEqual(u1.name, "John Doe")
u2 = User.objects.get(
poll__question__exact="What's the second question?"
)
self.assertEqual(u2.name, "Jim Bo")
def test_reverse_by_related_name(self):
p1 = Poll.objects.get(poll_choice__name__exact="This is the answer.")
self.assertEqual(p1.question, "What's the first question?")
p2 = Poll.objects.get(related_choice__name__exact='This is the answer.')
self.assertEqual(p2.question, "What's the second question?")
def test_reverse_field_name_disallowed(self):
"""
If a related_name is given you can't use the field name instead
"""
msg = (
"Cannot resolve keyword 'choice' into field. Choices are: "
"creator, creator_id, id, poll_choice, question, related_choice"
)
with self.assertRaisesMessage(FieldError, msg):
Poll.objects.get(choice__name__exact="This is the answer")
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