标签：多对多   integer   查询   man   code   sel   list   cts   rom   

Django的自关联

多对多关联

models.py
#### 自关联
class User(models.Model):
    name = models.CharField(max_length=32)
    gender_list = [
        (1,'男'),
        (2,'女')
        ]
gender = models.IntegerField(choices=gender_list, default=1)
m = models.ManyToManyField('User')  #关联自己

views.py:
#### 查询和zekai约会的姑娘
res = models.User.objects.filter(name='zekai', gender=1).first()
#print(res) ### obj
objs = res.m.all()
'''
1. select * from app01_user_m where  from_user_id = 1  ### to_user_id=[3,4]
2. select * from app01_user where id in (3,4)
'''
for obj in objs:
    print(obj.name)

#### 查询和cuihua约会的男生
res = models.User.objects.filter(name='cuihua', gender=2).first()
objs = res.user_set.all()
'''
1. select * from app01_user_m where  to_user_id = 3  ### from_user_id=[1,2]
2. select * from app01_user where id in (1,2) 
'''
for obj in objs:
    print(obj.name)

一对多

Django的自关联

标签：多对多   integer   查询   man   code   sel   list   cts   rom   

原文地址：https://www.cnblogs.com/bladecheng/p/11372261.html