day106 支付功能与优惠券功能 contentype

　　https://blog.csdn.net/Ayhan_huang/article/details/78626957

一、ContenType

from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.fields import GenericForeignKey,GenericRelation
# Create your models here.
class Electrics(models.Model):
    name =models.CharField(max_length=)
    price =models.IntegerField(default= )
    coupons =GenericRelation(to ="Coupon")

    def __str__(self):
        return self.name

class Clothes(models.Model):
    name =models.CharField(max_length=)
    price =models.IntegerField(default=  )
    coupon =GenericRelation(to ="Coupon")

    def __str__(self):
        return self.name

class Foods(models.Model):
    name =models.CharField(max_length=)
    price =models.IntegerField(default=)
    coupons =GenericRelation(to="Coupon")

    def __str__(self):
        return self.name

class Coupon(models.Model):
    name = models.CharField(max_length=)

    content_type =models.ForeignKey(to=ContentType) #step
    object_id =models.PositiveIntegerField() #step
    content_object =GenericForeignKey("content_type","object_id") # step 

    def __str__(self):
        return self.name

    # electics_obj =models.ForeignKey(to = "Foods",null=True)
    # food_obj =models.ForeignKey(to ="Foods",null=True)
    # cloth_obj =models.ForeignKey(to="Clothes",null=True)

"""
  Coupon 

     id  name            content_type_id          object_id
        冰箱满减优惠         

"""

views

from django.shortcuts import render,HttpResponse
from App01 import models
# Create your views here.

def  index(request):
    # 为三星电视(id=2)创建一条优惠记录
    # s_bingxiang = models.Electrics.objects.filter(id=2).first()
    # models.Coupon.objects.create(name='电冰箱优惠券', content_object=s_bingxiang)
    # models.Coupon.objects.create(name='猪蹄优惠券', content_type_id=10, object_id=1)

    #查询猪蹄买一送一优惠券对应商品的价格
    coupon =models.Coupon.objects.filter(name="猪蹄优惠券").first()

    #美的冰箱所有优惠券的名字
    meidi=models.Electrics.objects.filter(name ="美的冰箱").first()
    return HttpResponse("ok")

　　

二、支付宝接口

1.私钥是不能公开，一个公钥对应一个私钥。

2. 秘钥 对中 ，让大家知道的是公钥，不要告诉大家只有自己知道的是私钥。