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from django.contrib.auth.models import User
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db import models
class Review(models.Model):
source = models.CharField(max_length=100)
content_type = models.ForeignKey(ContentType, models.CASCADE)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey()
class Meta:
ordering = ("source",)
def __str__(self):
return self.source
class PersonManager(models.Manager):
def get_by_natural_key(self, name):
return self.get(name=name)
class Person(models.Model):
name = models.CharField(max_length=100, unique=True)
objects = PersonManager()
class Meta:
ordering = ("name",)
def __str__(self):
return self.name
# This book manager doesn't do anything interesting; it just
# exists to strip out the 'extra_arg' argument to certain
# calls. This argument is used to establish that the BookManager
# is actually getting used when it should be.
class BookManager(models.Manager):
def create(self, *args, extra_arg=None, **kwargs):
return super().create(*args, **kwargs)
def get_or_create(self, *args, extra_arg=None, **kwargs):
return super().get_or_create(*args, **kwargs)
class Book(models.Model):
title = models.CharField(max_length=100)
published = models.DateField()
authors = models.ManyToManyField(Person)
editor = models.ForeignKey(
Person, models.SET_NULL, null=True, related_name="edited"
)
reviews = GenericRelation(Review)
pages = models.IntegerField(default=100)
objects = BookManager()
class Meta:
ordering = ("title",)
def __str__(self):
return self.title
class Pet(models.Model):
name = models.CharField(max_length=100)
owner = models.ForeignKey(Person, models.CASCADE)
class Meta:
ordering = ("name",)
class UserProfile(models.Model):
user = models.OneToOneField(User, models.SET_NULL, null=True)
flavor = models.CharField(max_length=100)
class Meta:
ordering = ("flavor",)
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