70 lines
1.9 KiB
Python
70 lines
1.9 KiB
Python
"""
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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 django.core import meta
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class Employee(meta.Model):
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employee_code = meta.CharField(maxlength=10, primary_key=True)
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first_name = meta.CharField(maxlength=20)
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last_name = meta.CharField(maxlength=20)
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class META:
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ordering = ('last_name', 'first_name')
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def __repr__(self):
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return "%s %s" % (self.first_name, self.last_name)
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class Business(meta.Model):
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name = meta.CharField(maxlength=20, primary_key=True)
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employees = meta.ManyToManyField(Employee)
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class META:
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verbose_name_plural = 'businesses'
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module_name = 'businesses'
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def __repr__(self):
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return self.name
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API_TESTS = """
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>>> dan = employees.Employee(employee_code='ABC123', first_name='Dan', last_name='Jones')
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>>> dan.save()
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>>> employees.get_list()
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[Dan Jones]
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>>> fran = employees.Employee(employee_code='XYZ456', first_name='Fran', last_name='Bones')
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>>> fran.save()
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>>> employees.get_list()
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[Fran Bones, Dan Jones]
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>>> employees.get_object(pk='ABC123')
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Dan Jones
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>>> employees.get_object(pk='XYZ456')
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Fran Bones
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>>> employees.get_object(pk='foo')
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Traceback (most recent call last):
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...
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EmployeeDoesNotExist: Employee does not exist for {'pk': 'foo'}
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# Fran got married and changed her last name.
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>>> fran = employees.get_object(pk='XYZ456')
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>>> fran.last_name = 'Jones'
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>>> fran.save()
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>>> employees.get_list(last_name__exact='Jones')
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[Dan Jones, Fran Jones]
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>>> employees.get_in_bulk(['ABC123', 'XYZ456'])
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{'XYZ456': Fran Jones, 'ABC123': Dan Jones}
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>>> b = businesses.Business(name='Sears')
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>>> b.save()
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>>> b.set_employees([dan.employee_code, fran.employee_code])
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True
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>>> b.get_employee_list()
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[Dan Jones, Fran Jones]
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>>> fran.get_business_list()
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[Sears]
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>>> businesses.get_in_bulk(['Sears'])
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{'Sears': Sears}
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"""
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