7-6 列表筛选功能

在view中加入筛选城市逻辑

class OrgView(View):
    def get(self,request):
      all_orgs = CourseOrg.object.all()
      all_city = CityDict.object.all()
    #取出筛选城市
    city_id = request.GET.get('city','')
    if city_id:
      all_orgs = all_orgs.filter(city_id=int(city_id))
    org_nums = all_orgs.count()
    return render(request, 'org-list.html,{
       'all_orgs:orgs,
       'all_city:all_citys,
       'city_id':city_id,
})

在页面加入 点击city跳转逻辑