ORM外键约束
from django.db import models
# 出版社
class Publisher(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=64, null=False, unique=True)
def __str__(self):
return "<Publisher object: {}>".format(self.name)
# 书籍
class Book(models.Model):
id = models.AutoField(primary_key=True)
title = models.CharField(max_length=64, null=False, unique=True)
publisher = models.ForeignKey(to="Publisher")
def __str__(self):
return "<Book object: {}>".format(self.title)