业务需求：在一个广告小程序内发许多其他的小程序的优惠券。
1.原理流程图
2.奖品（优惠券）实验数据
1.修改apps/ad/models.py中的Prize表类
class Prize(models.Model): """奖品""" title = models.CharField(max_length=15, null=True, blank=True, verbose_name='标题', help_text='最多15字') url=models.CharField(max_length=200, null=True, blank=True, verbose_name='小程序url') area = models.ForeignKey(Area, null=True, blank=True, verbose_name="地区", on_delete=models.CASCADE) get_num=models.IntegerField(default=0,verbose_name='被领取数') price = models.IntegerField(default=0, verbose_name='所需积分') all_num=models.IntegerField(default=0,verbose_name='发布数') is_out=models.BooleanField(default=False,verbose_name='是否已售罄') desc = models.TextField(default='', max_length=400, verbose_name='描述', help_text='最多400字') usage = models.TextField(default='', max_length=200, verbose_name='使用方式', help_text='最多200字') image = models.ImageField(max_length=200, default='', upload_to='prizeimg/', verbose_name='奖品图片') end_time = models.DateTimeField(default=datetime.now, verbose_name='过期时间') add_time = models.DateTimeField(default=datetime.now, verbose_name='添加时间') class Meta: verbose_name = "奖品" verbose_name_plural = verbose_name def __str__(self): return self.title def image_url(self): return mark_safe('<img src="/media/{0}" class="field_img">'.format(self.image)) image_url.short_description = '奖品图片'
执行数据更新命令：
python manage.py makemigrations
python manage.py migrate
2.修改apps/ad/adminx.py中的PrizeAdmin
class PrizeAdmin(object): list_display = ["title", "get_num","is_out","url","price","area", "all_num", "desc","usage","end_time","image_url","add_time"] list_filter = ["title", "get_num","is_out","url", "price", "area","all_num", "desc","usage","end_time","add_time"] search_fields = ["title", "get_num", "price", "all_num", "desc","usage"]
3.通过xadmin后台，直接向奖品表Prize中填入一些实验
3.生成图片二维码
1.从网上下载14张（这个数目可以自定义的），然后放到gg/static/下新建目录2下，这些图片用于生成二维码的背景图：
2.安装myqr
pip install myqr
3.修改apps/user_operation/models.py中的GetPrize表类：
class GetPrize(models.Model): """兑奖表""" user = models.ForeignKey(UserProfile, verbose_name="用户", on_delete=models.CASCADE) prize=models.ForeignKey(Prize, verbose_name="奖品", on_delete=models.CASCADE) title = models.CharField(max_length=15, null=True, blank=True, verbose_name='标题', help_text='最多15字') status = models.CharField(choices=(("0", "未使用"), ("1", "已使用")),default="0",max_length=6, verbose_name="使用状态") twoimg=models.ImageField(max_length=200, default='', upload_to='twoimg/', verbose_name='二维码') end_time = models.DateTimeField(default=datetime.now, verbose_name='过期时间') add_time = models.DateTimeField(default=datetime.now, verbose_name="添加时间") class Meta: verbose_name = "兑奖表" verbose_name_plural = verbose_name def __str__(self): return self.prize.title def image_url(self): return mark_safe('<img src="/media/{0}" class="field_img">'.format(self.twoimg)) image_url.short_description = '二维码'
执行数据更新命令：
python manage.py makemigrations
python manage.py migrate
4.在apps/user_operation/views.py中新建BuyUseJiFen类：
#…… from users.models import UserProfile from .serializers import MessageModelSerializer,GetPrizeModelSerializer from .models import Message,GetPrize from ad.models import Prize from MyQR import myqr import os,random from gg.settings import BASE_DIR #…… class BuyUseJiFen(APIView): """购买积分商品,生成二维码，控制每个用户领取一次""" renderer_classes = [JSONRenderer] # 渲染器 def get(self,request): token = request.GET.get('token') user = UserProfile.objects.filter(token=token).first() prizeid=request.GET.get('prizeid') if user and prizeid: prizeid_int = int(prizeid) prize = Prize.objects.filter(id=prizeid_int).first() if prize.get_num>=prize.all_num: # 如果奖品的领取数大于等于发布数，则返回已售罄 prize.is_out=True prize.save() return HttpResponse('403') else: # 兑奖表，查看用户是否已经领取过了这个优惠券，如果已经领取过了则返回已经领取过了 p=GetPrize.objects.filter(user=user,prize=prize).first() if p: # 已经领取过了 return HttpResponse('404') else: # 用户未领取 # 扣除对应积分 if (user.jifen - prize.price)>=0: user.jifen = user.jifen - prize.price user.save() # 制作二维码 two_name=str(user.id)+'and'+prizeid+'.png'#生成二维码文件名 b = os.path.join(BASE_DIR, 'static/2/' + str(random.randint(1, 14)) + '.jpg')#背景图片路径 c_dir = os.path.join(BASE_DIR, 'media/twoimg')#生成二维码的存放目录 user_openid=user.open_id url=prize.url+"?pid="+prizeid+"&oid="+user_openid myqr.run(words=url,version=5,level='H',picture=b,colorized=True,save_dir=c_dir,save_name=two_name) # 生成兑奖表记录 new_getprize=GetPrize() new_getprize.user=user new_getprize.prize=prize new_getprize.title=prize.title new_getprize.end_time=prize.end_time new_getprize.twoimg='twoimg/'+two_name new_getprize.save() # 奖品被领取数+1 prize.is_out = False prize.get_num += 1 prize.save() msg = Message() msg.user = user msg.content = "您成功领取了 奖品：" +prize.title msg.save() return HttpResponse('200') else: # 积分不足 return HttpResponse('405') else: return HttpResponse('参数不足')
5.在apps/user_operation/urls.py内配置路由：
from django.urls import path from .views import GetMessage,ReadMessage,DelMessage,BuyUseJiFen urlpatterns = [ path('getmessage/',GetMessage.as_view()), path('readmessage/',ReadMessage.as_view()), path('delmessage/',DelMessage.as_view()), path('buyusejifen/',BuyUseJiFen.as_view()), ]