'''
实现方式一：列表页面：获取当前所有条件，添加到 - 编辑按钮的URL后面- 添加按钮的URL后面编辑或添加页面：- POST提交时，获取原来列表页面传过来的条件- 拼接URL  /hosts/?原来的条件list页面：list_condition = request.GET.urlencode(){% for item in host_list %}<li>{{ item }} <a href="/edit/{{id}}/?{{ list_condition }}">编辑</a></li>{% endfor %}add/edit页面：http://127.0.0.1:8000/edit/10/?page=5&id__gt=4def edit_host(request,pk):if request.method == "GET":return render(request,'edit_host.html')else:# 修改成功 /hosts/?page=5&id__gt=4url = "/hosts/?%s" %(request.GET.urlencode())return redirect(url)实现方式二：(更安全）list页面： http://127.0.0.1:8000/hosts/?page=5&id__gt=4params = QueryDict(mutable=True)params['_list_filter'] = request.GET.urlencode()list_condition = params.urlencode(){% for item in host_list %}<li>{{ item }} <a href="/edit/54/?{{ list_condition }}">编辑</a></li>{% endfor %}add/edit页面:http://127.0.0.1:8000/edit/54/?_list_filter=page%3D5%26id__gt%3D4def edit_host(request,pk):if request.method == "GET":return render(request,'edit_host.html')else:# 修改成功 /hosts/?page=5&id__gt=4url = "/hosts/?%s" %(request.GET.get('_list_filter'))return redirect(url)
'''

#1、已有QueryDict设置：
request.GET                                                        #（QueryDict对象）
request.GET._mutable = True#2、新建QueryDict设置：
params = QueryDict(mutable=True)

  from django.http import QueryDict  def edit(self,obj=None,is_header=False):if is_header:return '编辑'query_str = self.request.GET.urlencode()                                                           # page=2&nid=1if query_str:params = QueryDict(mutable=True)params[self._query_param_key] = query_strreturn mark_safe('<a href="%s?%s">编辑</a>' %(self.get_change_url(obj.id),params.urlencode(),)) # /stark/app01/userinfo/return mark_safe('<a href="%s">编辑</a>' % (self.get_change_url(obj.id),))                          # /stark/app01/userinfo/

    def change_view(self,request,nid,*args,**kwargs):# self.model_class.objects.filter(id=nid)obj = self.model_class.objects.filter(pk=nid).first()if not obj:return redirect(self.get_list_url())model_form_class = self.get_model_form_class()# GET,显示标签+默认值if request.method == 'GET':form = model_form_class(instance=obj)return render(request,'stark/change_view.html',{'form':form})else:form = model_form_class(instance=obj,data=request.POST)if form.is_valid():form.save()list_query_str = request.GET.get(self._query_param_key)list_url = "%s?%s" %(self.get_list_url(),list_query_str,)return redirect(list_url)return render(request, 'stark/change_view.html', {'form': form})