from django.db import models

class person(models.Model):

    name = CharField(max_length=30)

class book(models.Model):

    auther = ManyToManyField(person)

#添加关联

b.auther.add(p)

#去除关联

b.auther.remove(p)

#返回所有作者

b.auther.all()

#反向查询，返回这个人写的所有书,book即为反向查询的模型名

p.book_set.all()

from django.db import models

class person(models.Model):

    name = CharField(max_length=30)

class book(models.Model):

    #当关联同一个模型的字段大于一个时，要使用related_name参数来指定表名

    auther = ManyToManyField(person,related_name="auther")

    translater = ManyToManyField(person,related_name="translater")

#返回该人写的所有书，book_set被related_name中指定的表名代替

p.auther.all()

#返回该人翻译的所有书

p.translater.all()