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287565779d
only consider some fields (PostgreSQL only). For this, the ``distinct()`` QuerySet method now accepts an optional list of model fields names and generates ``DISTINCT ON`` clauses on these cases. Thanks Jeffrey Gelens and Anssi Kääriäinen for their work. Fixes #6422. git-svn-id: http://code.djangoproject.com/svn/django/trunk@17244 bcc190cf-cafb-0310-a4f2-bffc1f526a37
40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
from django.db import models
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class Tag(models.Model):
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name = models.CharField(max_length=10)
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parent = models.ForeignKey('self', blank=True, null=True,
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related_name='children')
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class Meta:
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ordering = ['name']
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def __unicode__(self):
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return self.name
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class Celebrity(models.Model):
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name = models.CharField("Name", max_length=20)
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greatest_fan = models.ForeignKey("Fan", null=True, unique=True)
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def __unicode__(self):
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return self.name
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class Fan(models.Model):
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fan_of = models.ForeignKey(Celebrity)
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class Staff(models.Model):
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id = models.IntegerField(primary_key=True)
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name = models.CharField(max_length=50)
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organisation = models.CharField(max_length=100)
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tags = models.ManyToManyField(Tag, through='StaffTag')
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coworkers = models.ManyToManyField('self')
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def __unicode__(self):
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return self.name
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class StaffTag(models.Model):
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staff = models.ForeignKey(Staff)
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tag = models.ForeignKey(Tag)
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def __unicode__(self):
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return u"%s -> %s" % (self.tag, self.staff)
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