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from django.db import DatabaseError, IntegrityError, transaction
from django.test import TestCase
from .models import Counter, InheritedCounter, ProxyCounter, SubCounter, WithCustomPK
class ForceTests(TestCase):
def test_force_update(self):
c = Counter.objects.create(name="one", value=1)
# The normal case
c.value = 2
c.save()
# Same thing, via an update
c.value = 3
c.save(force_update=True)
# Won't work because force_update and force_insert are mutually
# exclusive
c.value = 4
msg = "Cannot force both insert and updating in model saving."
with self.assertRaisesMessage(ValueError, msg):
c.save(force_insert=True, force_update=True)
# Try to update something that doesn't have a primary key in the first
# place.
c1 = Counter(name="two", value=2)
msg = "Cannot force an update in save() with no primary key."
with self.assertRaisesMessage(ValueError, msg):
with transaction.atomic():
c1.save(force_update=True)
c1.save(force_insert=True)
# Won't work because we can't insert a pk of the same value.
c.value = 5
with self.assertRaises(IntegrityError):
with transaction.atomic():
c.save(force_insert=True)
# Trying to update should still fail, even with manual primary keys, if
# the data isn't in the database already.
obj = WithCustomPK(name=1, value=1)
msg = "Forced update did not affect any rows."
with self.assertRaisesMessage(DatabaseError, msg):
with transaction.atomic():
obj.save(force_update=True)
class InheritanceTests(TestCase):
def test_force_update_on_inherited_model(self):
a = InheritedCounter(name="count", value=1, tag="spam")
a.save()
a.save(force_update=True)
def test_force_update_on_proxy_model(self):
a = ProxyCounter(name="count", value=1)
a.save()
a.save(force_update=True)
def test_force_update_on_inherited_model_without_fields(self):
"""
Issue 13864: force_update fails on subclassed models, if they don't
specify custom fields.
"""
a = SubCounter(name="count", value=1)
a.save()
a.value = 2
a.save(force_update=True)
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