204 lines
4.4 KiB
Python
204 lines
4.4 KiB
Python
import datetime
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from django.db import models
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class Place(models.Model):
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name = models.CharField(max_length=50)
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address = models.CharField(max_length=80)
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class Meta:
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ordering = ('name',)
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class Restaurant(Place):
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serves_hot_dogs = models.BooleanField(default=False)
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serves_pizza = models.BooleanField(default=False)
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class ItalianRestaurant(Restaurant):
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serves_gnocchi = models.BooleanField(default=False)
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class ParkingLot(Place):
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# An explicit link to the parent (we can control the attribute name).
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parent = models.OneToOneField(Place, models.CASCADE, primary_key=True, parent_link=True)
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capacity = models.IntegerField()
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class ParkingLot3(Place):
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# The parent_link connector need not be the pk on the model.
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primary_key = models.AutoField(primary_key=True)
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parent = models.OneToOneField(Place, models.CASCADE, parent_link=True)
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class ParkingLot4(models.Model):
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# Test parent_link connector can be discovered in abstract classes.
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parent = models.OneToOneField(Place, models.CASCADE, parent_link=True)
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class Meta:
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abstract = True
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class ParkingLot4A(ParkingLot4, Place):
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pass
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class ParkingLot4B(Place, ParkingLot4):
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pass
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class Supplier(models.Model):
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name = models.CharField(max_length=50)
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restaurant = models.ForeignKey(Restaurant, models.CASCADE)
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class Wholesaler(Supplier):
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retailer = models.ForeignKey(Supplier, models.CASCADE, related_name='wholesale_supplier')
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class Parent(models.Model):
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created = models.DateTimeField(default=datetime.datetime.now)
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class Child(Parent):
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name = models.CharField(max_length=10)
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class SelfRefParent(models.Model):
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parent_data = models.IntegerField()
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self_data = models.ForeignKey('self', models.SET_NULL, null=True)
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class SelfRefChild(SelfRefParent):
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child_data = models.IntegerField()
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class Article(models.Model):
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headline = models.CharField(max_length=100)
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pub_date = models.DateTimeField()
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class Meta:
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ordering = ('-pub_date', 'headline')
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class ArticleWithAuthor(Article):
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author = models.CharField(max_length=100)
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class M2MBase(models.Model):
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articles = models.ManyToManyField(Article)
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class M2MChild(M2MBase):
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name = models.CharField(max_length=50)
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class Evaluation(Article):
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quality = models.IntegerField()
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class Meta:
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abstract = True
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class QualityControl(Evaluation):
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assignee = models.CharField(max_length=50)
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class BaseM(models.Model):
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base_name = models.CharField(max_length=100)
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class DerivedM(BaseM):
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customPK = models.IntegerField(primary_key=True)
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derived_name = models.CharField(max_length=100)
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class AuditBase(models.Model):
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planned_date = models.DateField()
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class Meta:
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abstract = True
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verbose_name_plural = 'Audits'
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class CertificationAudit(AuditBase):
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class Meta(AuditBase.Meta):
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abstract = True
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class InternalCertificationAudit(CertificationAudit):
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auditing_dept = models.CharField(max_length=20)
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# Abstract classes don't get m2m tables autocreated.
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class Person(models.Model):
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name = models.CharField(max_length=100)
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class Meta:
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ordering = ('name',)
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class AbstractEvent(models.Model):
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name = models.CharField(max_length=100)
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attendees = models.ManyToManyField(Person, related_name="%(class)s_set")
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class Meta:
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abstract = True
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ordering = ('name',)
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class BirthdayParty(AbstractEvent):
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pass
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class BachelorParty(AbstractEvent):
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pass
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class MessyBachelorParty(BachelorParty):
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pass
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# Check concrete -> abstract -> concrete inheritance
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class SearchableLocation(models.Model):
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keywords = models.CharField(max_length=255)
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class Station(SearchableLocation):
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name = models.CharField(max_length=128)
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class Meta:
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abstract = True
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class BusStation(Station):
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inbound = models.BooleanField(default=False)
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class TrainStation(Station):
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zone = models.IntegerField()
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class User(models.Model):
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username = models.CharField(max_length=30, unique=True)
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class Profile(User):
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profile_id = models.AutoField(primary_key=True)
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extra = models.CharField(max_length=30, blank=True)
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# Check concrete + concrete -> concrete -> concrete
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class Politician(models.Model):
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politician_id = models.AutoField(primary_key=True)
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title = models.CharField(max_length=50)
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class Congressman(Person, Politician):
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state = models.CharField(max_length=2)
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class Senator(Congressman):
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pass
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