mirror of https://github.com/django/django.git
74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
"""
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1. Bare-bones model
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This is a basic model with only two non-primary-key fields.
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"""
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from django.core import meta
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class Article(meta.Model):
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fields = (
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meta.CharField('headline', maxlength=100),
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meta.DateTimeField('pub_date'),
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)
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API_TESTS = """
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# No articles are in the system yet.
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>>> articles.get_list()
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[]
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# Create an Article.
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>>> from datetime import datetime
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>>> a = articles.Article(id=None, headline='Area man programs in Python', pub_date=datetime(2005, 7, 28))
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# Save it into the database. You have to call save() explicitly.
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>>> a.save()
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# Now it has an ID. Note it's a long integer, as designated by the trailing "L".
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>>> a.id
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1L
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# Access database columns via Python attributes.
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>>> a.headline
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'Area man programs in Python'
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>>> a.pub_date
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datetime.datetime(2005, 7, 28, 0, 0)
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# Change values by changing the attributes, then calling save().
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>>> a.headline = 'Area woman programs in Python'
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>>> a.save()
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# get_list() displays all the articles in the database. Note that the article
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# is represented by "<Article object>", because we haven't given the Article
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# model a __repr__() method.
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>>> articles.get_list()
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[<Article object>]
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# Django provides a rich database lookup API that's entirely driven by
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# keyword arguments.
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>>> articles.get_object(id__exact=1)
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<Article object>
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>>> articles.get_object(headline__startswith='Area woman')
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<Article object>
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>>> articles.get_object(pub_date__year=2005)
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<Article object>
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# Django raises an ArticleDoesNotExist exception for get_object()
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>>> articles.get_object(id__exact=2)
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Traceback (most recent call last):
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...
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ArticleDoesNotExist: Article does not exist for {'id__exact': 2}
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# Lookup by a primary key is the most common case, so Django provides a
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# shortcut for primary-key exact lookups.
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# The following is identical to articles.get_object(id__exact=1).
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>>> articles.get_object(pk=1)
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<Article object>
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# Model instances of the same type and same ID are considered equal.
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>>> a = articles.get_object(pk=1)
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>>> b = articles.get_object(pk=1)
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>>> a == b
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True
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"""
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