author | Daniel Diniz <ajaksu@gmail.com> |
Fri, 03 Jul 2009 12:10:24 +0200 | |
changeset 2500 | ecc16ffe174b |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
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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 django.db import models |
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class Employee(models.Model): |
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employee_code = models.CharField(maxlength=10, primary_key=True, |
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db_column = 'code') |
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first_name = models.CharField(maxlength=20) |
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last_name = models.CharField(maxlength=20) |
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class Meta: |
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ordering = ('last_name', 'first_name') |
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|
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def __str__(self): |
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return "%s %s" % (self.first_name, self.last_name) |
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|
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class Business(models.Model): |
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name = models.CharField(maxlength=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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__test__ = {'API_TESTS':""" |
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>>> dan = Employee(employee_code='ABC123', first_name='Dan', last_name='Jones') |
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>>> dan.save() |
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>>> Employee.objects.all() |
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[<Employee: Dan Jones>] |
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|
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>>> fran = Employee(employee_code='XYZ456', first_name='Fran', last_name='Bones') |
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>>> fran.save() |
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>>> Employee.objects.all() |
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[<Employee: Fran Bones>, <Employee: Dan Jones>] |
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>>> Employee.objects.get(pk='ABC123') |
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<Employee: Dan Jones> |
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>>> Employee.objects.get(pk='XYZ456') |
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<Employee: Fran Bones> |
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>>> Employee.objects.get(pk='foo') |
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Traceback (most recent call last): |
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... |
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DoesNotExist: Employee matching query does not exist. |
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# Use the name of the primary key, rather than pk. |
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>>> Employee.objects.get(employee_code__exact='ABC123') |
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<Employee: Dan Jones> |
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# pk can be used as a substitute for the primary key. |
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>>> Employee.objects.filter(pk__in=['ABC123','XYZ456']) |
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[<Employee: Fran Bones>, <Employee: Dan Jones>] |
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# Fran got married and changed her last name. |
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>>> fran = Employee.objects.get(pk='XYZ456') |
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>>> fran.last_name = 'Jones' |
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>>> fran.save() |
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>>> Employee.objects.filter(last_name__exact='Jones') |
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[<Employee: Dan Jones>, <Employee: Fran Jones>] |
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>>> Employee.objects.in_bulk(['ABC123', 'XYZ456']) |
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{'XYZ456': <Employee: Fran Jones>, 'ABC123': <Employee: Dan Jones>} |
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>>> b = Business(name='Sears') |
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>>> b.save() |
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>>> b.employees.add(dan, fran) |
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>>> b.employees.all() |
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[<Employee: Dan Jones>, <Employee: Fran Jones>] |
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>>> fran.business_set.all() |
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[<Business: Sears>] |
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>>> Business.objects.in_bulk(['Sears']) |
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{'Sears': <Business: Sears>} |
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>>> Business.objects.filter(name__exact='Sears') |
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[<Business: Sears>] |
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>>> Business.objects.filter(pk='Sears') |
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[<Business: Sears>] |
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# Queries across tables, involving primary key |
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>>> Employee.objects.filter(business__name__exact='Sears') |
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[<Employee: Dan Jones>, <Employee: Fran Jones>] |
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>>> Employee.objects.filter(business__pk='Sears') |
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[<Employee: Dan Jones>, <Employee: Fran Jones>] |
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>>> Business.objects.filter(employees__employee_code__exact='ABC123') |
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[<Business: Sears>] |
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>>> Business.objects.filter(employees__pk='ABC123') |
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[<Business: Sears>] |
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>>> Business.objects.filter(employees__first_name__startswith='Fran') |
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[<Business: Sears>] |
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"""} |