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50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
"""
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Specifying ordering
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Specify default ordering for a model using the ``ordering`` attribute, which
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should be a list or tuple of field names. This tells Django how to order
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``QuerySet`` results.
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If a field name in ``ordering`` starts with a hyphen, that field will be
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ordered in descending order. Otherwise, it'll be ordered in ascending order.
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The special-case field name ``"?"`` specifies random order.
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The ordering attribute is not required. If you leave it off, ordering will be
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undefined -- not random, just undefined.
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"""
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from django.db import models
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from django.utils.encoding import python_2_unicode_compatible
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class Author(models.Model):
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class Meta:
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ordering = ('-pk',)
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@python_2_unicode_compatible
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class Article(models.Model):
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author = models.ForeignKey(Author, models.SET_NULL, null=True)
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second_author = models.ForeignKey(Author, models.SET_NULL, null=True, related_name='+')
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headline = models.CharField(max_length=100)
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pub_date = models.DateTimeField()
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class Meta:
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ordering = ('-pub_date', 'headline')
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def __str__(self):
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return self.headline
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class OrderedByAuthorArticle(Article):
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class Meta:
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proxy = True
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ordering = ('author', 'second_author')
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class Reference(models.Model):
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article = models.ForeignKey(OrderedByAuthorArticle, models.CASCADE)
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class Meta:
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ordering = ('article',)
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