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156 lines
4.6 KiB
Python
156 lines
4.6 KiB
Python
from datetime import datetime
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from django.db import models
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# M2M described on one of the models
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class Person(models.Model):
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name = models.CharField(max_length=128)
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class Meta:
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ordering = ('name',)
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def __str__(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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members = models.ManyToManyField(Person, through='Membership')
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custom_members = models.ManyToManyField(Person, through='CustomMembership', related_name="custom")
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nodefaultsnonulls = models.ManyToManyField(
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Person,
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through='TestNoDefaultsOrNulls',
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related_name="testnodefaultsnonulls",
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)
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class Meta:
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ordering = ('name',)
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def __str__(self):
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return self.name
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class Membership(models.Model):
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person = models.ForeignKey(Person, models.CASCADE)
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group = models.ForeignKey(Group, models.CASCADE)
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date_joined = models.DateTimeField(default=datetime.now)
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invite_reason = models.CharField(max_length=64, null=True)
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class Meta:
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ordering = ('date_joined', 'invite_reason', 'group')
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def __str__(self):
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return "%s is a member of %s" % (self.person.name, self.group.name)
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class CustomMembership(models.Model):
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person = models.ForeignKey(
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Person,
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models.CASCADE,
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db_column="custom_person_column",
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related_name="custom_person_related_name",
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)
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group = models.ForeignKey(Group, models.CASCADE)
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weird_fk = models.ForeignKey(Membership, models.SET_NULL, null=True)
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date_joined = models.DateTimeField(default=datetime.now)
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class Meta:
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db_table = "test_table"
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ordering = ["date_joined"]
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def __str__(self):
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return "%s is a member of %s" % (self.person.name, self.group.name)
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class TestNoDefaultsOrNulls(models.Model):
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person = models.ForeignKey(Person, models.CASCADE)
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group = models.ForeignKey(Group, models.CASCADE)
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nodefaultnonull = models.IntegerField()
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class PersonSelfRefM2M(models.Model):
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name = models.CharField(max_length=5)
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friends = models.ManyToManyField('self', through="Friendship", symmetrical=False)
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sym_friends = models.ManyToManyField('self', through='SymmetricalFriendship', symmetrical=True)
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def __str__(self):
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return self.name
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class Friendship(models.Model):
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first = models.ForeignKey(PersonSelfRefM2M, models.CASCADE, related_name="rel_from_set")
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second = models.ForeignKey(PersonSelfRefM2M, models.CASCADE, related_name="rel_to_set")
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date_friended = models.DateTimeField()
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class SymmetricalFriendship(models.Model):
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first = models.ForeignKey(PersonSelfRefM2M, models.CASCADE)
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second = models.ForeignKey(PersonSelfRefM2M, models.CASCADE, related_name='+')
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date_friended = models.DateField()
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# Custom through link fields
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class Event(models.Model):
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title = models.CharField(max_length=50)
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invitees = models.ManyToManyField(
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Person, through='Invitation',
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through_fields=('event', 'invitee'),
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related_name='events_invited',
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)
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def __str__(self):
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return self.title
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class Invitation(models.Model):
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event = models.ForeignKey(Event, models.CASCADE, related_name='invitations')
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# field order is deliberately inverted. the target field is "invitee".
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inviter = models.ForeignKey(Person, models.CASCADE, related_name='invitations_sent')
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invitee = models.ForeignKey(Person, models.CASCADE, related_name='invitations')
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class Employee(models.Model):
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name = models.CharField(max_length=5)
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subordinates = models.ManyToManyField(
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'self',
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through="Relationship",
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through_fields=('source', 'target'),
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symmetrical=False,
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)
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class Meta:
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ordering = ('pk',)
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def __str__(self):
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return self.name
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class Relationship(models.Model):
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# field order is deliberately inverted.
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another = models.ForeignKey(Employee, models.SET_NULL, related_name="rel_another_set", null=True)
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target = models.ForeignKey(Employee, models.CASCADE, related_name="rel_target_set")
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source = models.ForeignKey(Employee, models.CASCADE, related_name="rel_source_set")
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class Ingredient(models.Model):
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iname = models.CharField(max_length=20, unique=True)
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class Meta:
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ordering = ('iname',)
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class Recipe(models.Model):
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rname = models.CharField(max_length=20, unique=True)
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ingredients = models.ManyToManyField(
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Ingredient, through='RecipeIngredient', related_name='recipes',
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)
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class Meta:
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ordering = ('rname',)
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class RecipeIngredient(models.Model):
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ingredient = models.ForeignKey(Ingredient, models.CASCADE, to_field='iname')
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recipe = models.ForeignKey(Recipe, models.CASCADE, to_field='rname')
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