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from datetime import datetime
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
# M2M described on one of the models
@python_2_unicode_compatible
class Person(models.Model):
name = models.CharField(max_length=128)
class Meta:
ordering = ('name',)
def __str__(self):
return self.name
@python_2_unicode_compatible
class Group(models.Model):
name = models.CharField(max_length=128)
members = models.ManyToManyField(Person, through='Membership')
custom_members = models.ManyToManyField(Person, through='CustomMembership', related_name="custom")
nodefaultsnonulls = models.ManyToManyField(Person, through='TestNoDefaultsOrNulls', related_name="testnodefaultsnonulls")
class Meta:
ordering = ('name',)
def __str__(self):
return self.name
@python_2_unicode_compatible
class Membership(models.Model):
person = models.ForeignKey(Person)
group = models.ForeignKey(Group)
date_joined = models.DateTimeField(default=datetime.now)
invite_reason = models.CharField(max_length=64, null=True)
class Meta:
ordering = ('date_joined', 'invite_reason', 'group')
def __str__(self):
return "%s is a member of %s" % (self.person.name, self.group.name)
@python_2_unicode_compatible
class CustomMembership(models.Model):
person = models.ForeignKey(Person, db_column="custom_person_column", related_name="custom_person_related_name")
group = models.ForeignKey(Group)
weird_fk = models.ForeignKey(Membership, null=True)
date_joined = models.DateTimeField(default=datetime.now)
def __str__(self):
return "%s is a member of %s" % (self.person.name, self.group.name)
class Meta:
db_table = "test_table"
class TestNoDefaultsOrNulls(models.Model):
person = models.ForeignKey(Person)
group = models.ForeignKey(Group)
nodefaultnonull = models.CharField(max_length=5)
@python_2_unicode_compatible
class PersonSelfRefM2M(models.Model):
name = models.CharField(max_length=5)
friends = models.ManyToManyField('self', through="Friendship", symmetrical=False)
def __str__(self):
return self.name
class Friendship(models.Model):
first = models.ForeignKey(PersonSelfRefM2M, related_name="rel_from_set")
second = models.ForeignKey(PersonSelfRefM2M, related_name="rel_to_set")
date_friended = models.DateTimeField()
# Custom through link fields
@python_2_unicode_compatible
class Event(models.Model):
title = models.CharField(max_length=50)
invitees = models.ManyToManyField(Person, through='Invitation', through_fields=('event', 'invitee'), related_name='events_invited')
def __str__(self):
return self.title
class Invitation(models.Model):
event = models.ForeignKey(Event, related_name='invitations')
# field order is deliberately inverted. the target field is "invitee".
inviter = models.ForeignKey(Person, related_name='invitations_sent')
invitee = models.ForeignKey(Person, related_name='invitations')
@python_2_unicode_compatible
class Employee(models.Model):
name = models.CharField(max_length=5)
subordinates = models.ManyToManyField('self', through="Relationship", through_fields=('source', 'target'), symmetrical=False)
class Meta:
ordering = ('pk',)
def __str__(self):
return self.name
class Relationship(models.Model):
# field order is deliberately inverted.
another = models.ForeignKey(Employee, related_name="rel_another_set", null=True)
target = models.ForeignKey(Employee, related_name="rel_target_set")
source = models.ForeignKey(Employee, related_name="rel_source_set")
class Ingredient(models.Model):
iname = models.CharField(max_length=20, unique=True)
class Meta:
ordering = ('iname',)
class Recipe(models.Model):
rname = models.CharField(max_length=20, unique=True)
ingredients = models.ManyToManyField(
Ingredient, through='RecipeIngredient', related_name='recipes',
)
class Meta:
ordering = ('rname',)
class RecipeIngredient(models.Model):
ingredient = models.ForeignKey(Ingredient, to_field='iname')
recipe = models.ForeignKey(Recipe, to_field='rname')
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