25 图书管理系统表设计

class Book(models.Model):
    title = models.CharField(max_length=32)
    price = models.DecimalField(max_digits=8, decimal_places=2)
    publish_time = models.DateField(auto_now_add=True)
    publish = models.ForeignKey(to='Publish')
    authors = models.ManyToManyField(to='Author')


class Publish(models.Model):
    name = models.CharField(max_length=32)
    addr = models.CharField(max_length=64)


class Author(models.Model):
    name = models.CharField(max_length=32)
    age = models.IntegerField()
    author_detail = models.OneToOneField(to='AuthorDetail')

    
class AuthorDetail(models.Model):
    phone = models.BigIntegerField()
    addr = models.CharField(max_length=32)