author | Todd Larsen <tlarsen@google.com> |
Tue, 26 Aug 2008 21:49:54 +0000 | |
changeset 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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""" |
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33. get_or_create() |
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get_or_create() does what it says: it tries to look up an object with the given |
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parameters. If an object isn't found, it creates one with the given parameters. |
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""" |
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from django.db import models |
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class Person(models.Model): |
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first_name = models.CharField(maxlength=100) |
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last_name = models.CharField(maxlength=100) |
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birthday = models.DateField() |
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def __str__(self): |
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return '%s %s' % (self.first_name, self.last_name) |
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__test__ = {'API_TESTS':""" |
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# Acting as a divine being, create an Person. |
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>>> from datetime import date |
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>>> p = Person(first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)) |
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>>> p.save() |
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# Only one Person is in the database at this point. |
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>>> Person.objects.count() |
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1 |
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# get_or_create() a person with similar first names. |
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>>> p, created = Person.objects.get_or_create(first_name='John', last_name='Lennon', defaults={'birthday': date(1940, 10, 9)}) |
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# get_or_create() didn't have to create an object. |
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>>> created |
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False |
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# There's still only one Person in the database. |
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>>> Person.objects.count() |
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1 |
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# get_or_create() a Person with a different name. |
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>>> p, created = Person.objects.get_or_create(first_name='George', last_name='Harrison', defaults={'birthday': date(1943, 2, 25)}) |
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>>> created |
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True |
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>>> Person.objects.count() |
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2 |
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# If we execute the exact same statement, it won't create a Person. |
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>>> p, created = Person.objects.get_or_create(first_name='George', last_name='Harrison', defaults={'birthday': date(1943, 2, 25)}) |
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>>> created |
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False |
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>>> Person.objects.count() |
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2 |
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"""} |