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django/tests/modeltests/get_or_create/models.py
Malcolm Tredinnick e94d293504 There are some variations in the printed names of exceptions between Oracle and
other database backends, but the exception classes should still be the same.
This commit changes the way the tests check for specific database errors to be
more portable between implementations.

It's possible these tests will still fail if, e.g., Oracle doesn't raise
IntegrityError (but raises DatabaseError) when we except it to, but we can
cross that bridge if and when it appears.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8450 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-08-20 18:50:06 +00:00

65 lines
1.9 KiB
Python

"""
33. get_or_create()
``get_or_create()`` does what it says: it tries to look up an object with the
given parameters. If an object isn't found, it creates one with the given
parameters.
"""
from django.db import models, IntegrityError
class Person(models.Model):
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=100)
birthday = models.DateField()
def __unicode__(self):
return u'%s %s' % (self.first_name, self.last_name)
__test__ = {'API_TESTS':"""
# Acting as a divine being, create an Person.
>>> from datetime import date
>>> p = Person(first_name='John', last_name='Lennon', birthday=date(1940, 10, 9))
>>> p.save()
# Only one Person is in the database at this point.
>>> Person.objects.count()
1
# get_or_create() a person with similar first names.
>>> p, created = Person.objects.get_or_create(first_name='John', last_name='Lennon', defaults={'birthday': date(1940, 10, 9)})
# get_or_create() didn't have to create an object.
>>> created
False
# There's still only one Person in the database.
>>> Person.objects.count()
1
# get_or_create() a Person with a different name.
>>> p, created = Person.objects.get_or_create(first_name='George', last_name='Harrison', defaults={'birthday': date(1943, 2, 25)})
>>> created
True
>>> Person.objects.count()
2
# If we execute the exact same statement, it won't create a Person.
>>> p, created = Person.objects.get_or_create(first_name='George', last_name='Harrison', defaults={'birthday': date(1943, 2, 25)})
>>> created
False
>>> Person.objects.count()
2
# If you don't specify a value or default value for all required fields, you
# will get an error.
>>> try:
... p, created = Person.objects.get_or_create(first_name='Tom', last_name='Smith')
... except Exception, e:
... if isinstance(e, IntegrityError):
... print "Pass"
... else:
... print "Fail with %s" % type(e)
Pass
"""}