django/tests/testapp/models/custom_pk.py

70 lines
1.9 KiB
Python

"""
14. Using a custom primary key
By default, Django adds an ``"id"`` field to each model. But you can override
this behavior by explicitly adding ``primary_key=True`` to a field.
"""
from django.core import meta
class Employee(meta.Model):
employee_code = meta.CharField(maxlength=10, primary_key=True)
first_name = meta.CharField(maxlength=20)
last_name = meta.CharField(maxlength=20)
class META:
ordering = ('last_name', 'first_name')
def __repr__(self):
return "%s %s" % (self.first_name, self.last_name)
class Business(meta.Model):
name = meta.CharField(maxlength=20, primary_key=True)
employees = meta.ManyToManyField(Employee)
class META:
verbose_name_plural = 'businesses'
module_name = 'businesses'
def __repr__(self):
return self.name
API_TESTS = """
>>> dan = employees.Employee(employee_code='ABC123', first_name='Dan', last_name='Jones')
>>> dan.save()
>>> employees.get_list()
[Dan Jones]
>>> fran = employees.Employee(employee_code='XYZ456', first_name='Fran', last_name='Bones')
>>> fran.save()
>>> employees.get_list()
[Fran Bones, Dan Jones]
>>> employees.get_object(pk='ABC123')
Dan Jones
>>> employees.get_object(pk='XYZ456')
Fran Bones
>>> employees.get_object(pk='foo')
Traceback (most recent call last):
...
EmployeeDoesNotExist: Employee does not exist for {'pk': 'foo'}
# Fran got married and changed her last name.
>>> fran = employees.get_object(pk='XYZ456')
>>> fran.last_name = 'Jones'
>>> fran.save()
>>> employees.get_list(last_name__exact='Jones')
[Dan Jones, Fran Jones]
>>> employees.get_in_bulk(['ABC123', 'XYZ456'])
{'XYZ456': Fran Jones, 'ABC123': Dan Jones}
>>> b = businesses.Business(name='Sears')
>>> b.save()
>>> b.set_employees([dan.employee_code, fran.employee_code])
True
>>> b.get_employee_list()
[Dan Jones, Fran Jones]
>>> fran.get_business_list()
[Sears]
>>> businesses.get_in_bulk(['Sears'])
{'Sears': Sears}
"""