102 lines
3.3 KiB
Python
102 lines
3.3 KiB
Python
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from django.db import models
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from datetime import datetime
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from django.contrib.auth.models import User
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# Forward declared intermediate model
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class Membership(models.Model):
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person = models.ForeignKey('Person')
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group = models.ForeignKey('Group')
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date_joined = models.DateTimeField(default=datetime.now)
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def __unicode__(self):
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return "%s is a member of %s" % (self.person.name, self.group.name)
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class UserMembership(models.Model):
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user = models.ForeignKey(User)
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group = models.ForeignKey('Group')
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date_joined = models.DateTimeField(default=datetime.now)
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def __unicode__(self):
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return "%s is a user and member of %s" % (self.user.username, self.group.name)
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class Person(models.Model):
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name = models.CharField(max_length=128)
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def __unicode__(self):
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return self.name
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class Group(models.Model):
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name = models.CharField(max_length=128)
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# Membership object defined as a class
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members = models.ManyToManyField(Person, through=Membership)
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user_members = models.ManyToManyField(User, through='UserMembership')
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def __unicode__(self):
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return self.name
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__test__ = {'API_TESTS':"""
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# Create some dummy data
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>>> bob = Person.objects.create(name='Bob')
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>>> jim = Person.objects.create(name='Jim')
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>>> rock = Group.objects.create(name='Rock')
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>>> roll = Group.objects.create(name='Roll')
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>>> frank = User.objects.create_user('frank','frank@example.com','password')
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>>> jane = User.objects.create_user('jane','jane@example.com','password')
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# Now test that the forward declared Membership works
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>>> Membership.objects.create(person=bob, group=rock)
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<Membership: Bob is a member of Rock>
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>>> Membership.objects.create(person=bob, group=roll)
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<Membership: Bob is a member of Roll>
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>>> Membership.objects.create(person=jim, group=rock)
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<Membership: Jim is a member of Rock>
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>>> bob.group_set.all()
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[<Group: Rock>, <Group: Roll>]
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>>> roll.members.all()
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[<Person: Bob>]
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# Error messages use the model name, not repr of the class name
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>>> bob.group_set = []
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Traceback (most recent call last):
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...
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AttributeError: Cannot set values on a ManyToManyField which specifies an intermediary model. Use Membership's Manager instead.
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>>> roll.members = []
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Traceback (most recent call last):
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...
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AttributeError: Cannot set values on a ManyToManyField which specifies an intermediary model. Use Membership's Manager instead.
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>>> rock.members.create(name='Anne')
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Traceback (most recent call last):
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...
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AttributeError: Cannot use create() on a ManyToManyField which specifies an intermediary model. Use Membership's Manager instead.
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>>> bob.group_set.create(name='Funk')
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Traceback (most recent call last):
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...
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AttributeError: Cannot use create() on a ManyToManyField which specifies an intermediary model. Use Membership's Manager instead.
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# Now test that the intermediate with a relationship outside
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# the current app (i.e., UserMembership) workds
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>>> UserMembership.objects.create(user=frank, group=rock)
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<UserMembership: frank is a user and member of Rock>
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>>> UserMembership.objects.create(user=frank, group=roll)
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<UserMembership: frank is a user and member of Roll>
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>>> UserMembership.objects.create(user=jane, group=rock)
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<UserMembership: jane is a user and member of Rock>
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>>> frank.group_set.all()
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[<Group: Rock>, <Group: Roll>]
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>>> roll.user_members.all()
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[<User: frank>]
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"""}
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