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git-svn-id: http://code.djangoproject.com/svn/django/trunk@8102 bcc190cf-cafb-0310-a4f2-bffc1f526a37
51 lines
1.1 KiB
Python
51 lines
1.1 KiB
Python
"""
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21. Specifying 'choices' for a field
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Most fields take a ``choices`` parameter, which should be a tuple of tuples
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specifying which are the valid values for that field.
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For each field that has ``choices``, a model instance gets a
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``get_fieldname_display()`` method, where ``fieldname`` is the name of the
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field. This method returns the "human-readable" value of the field.
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"""
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from django.db import models
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GENDER_CHOICES = (
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('M', 'Male'),
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('F', 'Female'),
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)
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class Person(models.Model):
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name = models.CharField(max_length=20)
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gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
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def __unicode__(self):
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return self.name
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__test__ = {'API_TESTS':"""
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>>> a = Person(name='Adrian', gender='M')
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>>> a.save()
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>>> s = Person(name='Sara', gender='F')
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>>> s.save()
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>>> a.gender
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'M'
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>>> s.gender
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'F'
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>>> a.get_gender_display()
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u'Male'
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>>> s.get_gender_display()
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u'Female'
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# If the value for the field doesn't correspond to a valid choice,
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# the value itself is provided as a display value.
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>>> a.gender = ''
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>>> a.get_gender_display()
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u''
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>>> a.gender = 'U'
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>>> a.get_gender_display()
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u'U'
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"""}
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