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52 lines
1.2 KiB
Python
52 lines
1.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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14. Using a custom primary key
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By default, Django adds an ``"id"`` field to each model. But you can override
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this behavior by explicitly adding ``primary_key=True`` to a field.
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"""
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from __future__ import unicode_literals
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from django.db import models
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from .fields import MyAutoField
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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 Employee(models.Model):
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employee_code = models.IntegerField(primary_key=True, db_column='code')
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first_name = models.CharField(max_length=20)
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last_name = models.CharField(max_length=20)
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class Meta:
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ordering = ('last_name', 'first_name')
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def __str__(self):
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return "%s %s" % (self.first_name, self.last_name)
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@python_2_unicode_compatible
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class Business(models.Model):
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name = models.CharField(max_length=20, primary_key=True)
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employees = models.ManyToManyField(Employee)
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class Meta:
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verbose_name_plural = 'businesses'
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def __str__(self):
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return self.name
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@python_2_unicode_compatible
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class Bar(models.Model):
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id = MyAutoField(primary_key=True, db_index=True)
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def __str__(self):
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return repr(self.pk)
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class Foo(models.Model):
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bar = models.ForeignKey(Bar)
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