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"