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django/tests/modeltests/force_insert_update/models.py
Malcolm Tredinnick 220993bcc5 Added savepoint support to the transaction code.
This is a no-op for most databases. Only necessary on PostgreSQL so that we can
do things which will possibly intentionally raise an IntegrityError and not
have to rollback the entire transaction. Not supported for PostgreSQL versions
prior to 8.0, so should be used sparingly in internal Django code.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8314 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-08-12 05:34:56 +00:00

61 lines
1.6 KiB
Python

"""
Tests for forcing insert and update queries (instead of Django's normal
automatic behaviour).
"""
from django.db import models, transaction
class Counter(models.Model):
name = models.CharField(max_length = 10)
value = models.IntegerField()
class WithCustomPK(models.Model):
name = models.IntegerField(primary_key=True)
value = models.IntegerField()
__test__ = {"API_TESTS": """
>>> 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
>>> c.save(force_insert=True, force_update=True)
Traceback (most recent call last):
...
ValueError: Cannot force both insert and updating in model saving.
# Try to update something that doesn't have a primary key in the first place.
>>> c1 = Counter(name="two", value=2)
>>> c1.save(force_update=True)
Traceback (most recent call last):
...
ValueError: Cannot force an update in save() with no primary key.
>>> c1.save(force_insert=True)
# Won't work because we can't insert a pk of the same value.
>>> sid = transaction.savepoint()
>>> c.value = 5
>>> c.save(force_insert=True)
Traceback (most recent call last):
...
IntegrityError: ...
>>> transaction.savepoint_rollback(sid)
# 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)
>>> obj.save(force_update=True)
Traceback (most recent call last):
...
DatabaseError: ...
"""
}