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from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db import models
class Square(models.Model):
root = models.IntegerField()
square = models.PositiveIntegerField()
def __str__(self):
return "%s ** 2 == %s" % (self.root, self.square)
class Person(models.Model):
first_name = models.CharField(max_length=20)
last_name = models.CharField(max_length=20)
def __str__(self):
return "%s %s" % (self.first_name, self.last_name)
class SchoolClassManager(models.Manager):
def get_queryset(self):
return super().get_queryset().exclude(year=1000)
class SchoolClass(models.Model):
year = models.PositiveIntegerField()
day = models.CharField(max_length=9, blank=True)
last_updated = models.DateTimeField()
objects = SchoolClassManager()
class SchoolBusManager(models.Manager):
def get_queryset(self):
return super().get_queryset().prefetch_related("schoolclasses")
class SchoolBus(models.Model):
number = models.IntegerField()
schoolclasses = models.ManyToManyField("SchoolClass")
objects = SchoolBusManager()
class Meta:
base_manager_name = "objects"
class VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ(models.Model):
primary_key_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.AutoField(
primary_key=True
)
charfield_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.CharField(
max_length=100
)
m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = (
models.ManyToManyField(Person, blank=True)
)
class Tag(models.Model):
name = models.CharField(max_length=30)
content_type = models.ForeignKey(
ContentType, models.CASCADE, related_name="backend_tags"
)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey("content_type", "object_id")
class Post(models.Model):
name = models.CharField(max_length=30)
text = models.TextField()
tags = GenericRelation("Tag")
class Meta:
db_table = "CaseSensitive_Post"
class Reporter(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
def __str__(self):
return "%s %s" % (self.first_name, self.last_name)
class ReporterProxy(Reporter):
class Meta:
proxy = True
class Article(models.Model):
headline = models.CharField(max_length=100)
pub_date = models.DateField()
reporter = models.ForeignKey(Reporter, models.CASCADE)
reporter_proxy = models.ForeignKey(
ReporterProxy,
models.SET_NULL,
null=True,
related_name="reporter_proxy",
)
def __str__(self):
return self.headline
class Item(models.Model):
name = models.CharField(max_length=30)
date = models.DateField()
time = models.TimeField()
last_modified = models.DateTimeField()
def __str__(self):
return self.name
class Object(models.Model):
related_objects = models.ManyToManyField(
"self", db_constraint=False, symmetrical=False
)
obj_ref = models.ForeignKey("ObjectReference", models.CASCADE, null=True)
def __str__(self):
return str(self.id)
class ObjectReference(models.Model):
obj = models.ForeignKey(Object, models.CASCADE, db_constraint=False)
def __str__(self):
return str(self.obj_id)
class ObjectSelfReference(models.Model):
key = models.CharField(max_length=3, unique=True)
obj = models.ForeignKey("ObjectSelfReference", models.SET_NULL, null=True)
class CircularA(models.Model):
key = models.CharField(max_length=3, unique=True)
obj = models.ForeignKey("CircularB", models.SET_NULL, null=True)
def natural_key(self):
return (self.key,)
class CircularB(models.Model):
key = models.CharField(max_length=3, unique=True)
obj = models.ForeignKey("CircularA", models.SET_NULL, null=True)
def natural_key(self):
return (self.key,)
class RawData(models.Model):
raw_data = models.BinaryField()
class Author(models.Model):
name = models.CharField(max_length=255, unique=True)
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE, to_field="name")
class SQLKeywordsModel(models.Model):
id = models.AutoField(primary_key=True, db_column="select")
reporter = models.ForeignKey(Reporter, models.CASCADE, db_column="where")
class Meta:
db_table = "order"
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