Django外鍵關系：一對一、一對多，多對多

1、 一對多

　　model.py

class UserTest(models.Model):
    name = models.CharField(max_length = 16 )
    sex = models.CharField(max_length = 16 )
    hobby = models.CharField(max_length = 32 )

class Ariticle(models.Model):
    title = models.CharField(max_length = 32 )
    content = models.CharField(max_length = 255 )
    time = models.CharField(max_length=32)
    admin_user2 = models.ForeignKey( to= UserTest ,on_delete=models.CASCADE)

　　view.py

def index(request):
    p2 = UserTest.objects.create(name='小明同學', sex='男', hobby='籃球')
    p1 = Ariticle(admin_user2=p2,title='八戒你瘦d了', content='不做大哥好多年', time='2018-1-8')
    p1.save()
    return HttpResponse(u"八戒你瘦了!")

2、一對一

　　一對一的情況和這個差不多，只要把外鍵的設置改成model.OneToOneField、多對多也是一樣的。

3、連表查詢

# 外鍵連表查詢,在添加外鍵的表上查用戶表
# p = Ariticle.objects.filter(title='八戒')[0]  # 返回值是一個列表里面放對象
# print(p.admin_user2.name)