Django 多对多表的三种创建方式

class Book(models.Model):
    name = models.CharField(max_length=32)
    # 第一种自动创建
    authors = models.ManyToManyField(to=‘Author‘)
   

class Author(models.Model):
    name = models.CharField(max_length=32)

class Book2(models.Model):
    name = models.CharField(max_length=32)


class Author2(models.Model):
    name = models.CharField(max_length=32)


# 手动创建第三张表
class Book2Author(models.Model):
    book = models.ForeignKey(to=‘Book2‘)
    author = models.ForeignKey(to=‘Author2‘)

class Book3(models.Model):
    name = models.CharField(max_length=32)
    author = models.ManyToManyField(to=‘Author3‘,through=‘Book3Author‘,through_fields=(‘book‘,‘author‘))


class Author3(models.Model):
    name = models.CharField(max_length=32)


class Book3Author(models.Model):
    book = models.ForeignKey(to=‘Book3‘)
    author = models.ForeignKey(to=‘Author3‘)
    info = models.CharField(max_length=32)