41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
"""
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3. Giving models custom methods
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Any method you add to a model will be available to instances.
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"""
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import datetime
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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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@python_2_unicode_compatible
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class Article(models.Model):
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headline = models.CharField(max_length=100)
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pub_date = models.DateField()
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def __str__(self):
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return self.headline
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def was_published_today(self):
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return self.pub_date == datetime.date.today()
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def articles_from_same_day_1(self):
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return Article.objects.filter(pub_date=self.pub_date).exclude(id=self.id)
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def articles_from_same_day_2(self):
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"""
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Verbose version of get_articles_from_same_day_1, which does a custom
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database query for the sake of demonstration.
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"""
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from django.db import connection
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with connection.cursor() as cursor:
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cursor.execute("""
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SELECT id, headline, pub_date
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FROM custom_methods_article
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WHERE pub_date = %s
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AND id != %s""", [connection.ops.value_to_db_date(self.pub_date),
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self.id])
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return [self.__class__(*row) for row in cursor.fetchall()]
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