基于Django类的视图:在调度中验证对象 [英] Django Class Based View: Validate object in dispatch
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问题描述
有没有一种确定的方法,当在$ / code> self.get_object()稍后在get / post中调用时,我会在调度中验证一个对象而不进行额外的数据库调用? / p>
这是我到目前为止(这个问题略有改变):
class CourseUpdateView(UpdateView):
def dispatch(self,request,* args,** kwargs):
self.request = request
self.kwargs = kwargs
self.object = self.get_object()
如果self.object.is_online:
messages.warning(请求,抱歉这个不能更新)
return redirect(course:detail,pk = self.kwargs ['pk'])
#这将要调用self.get_object不是吗?
返回UpdateView.dispatch(self,request,* args,** kwargs)
解决方案
您可以缓存 get_object()
的结果。
例如:
class CourseUpdateView(UpdateView):
#[...]您的调度方法
def get_object(self):
#每个请求调用get_object多少次
#不应该多个请求
如果不是hasattr(self, '_object'):
self._object = super(CourseUpdateView,self).get_object()
return self._object
Is there a established way that i validate an object in the dispatch without making an extra database call when self.get_object()
is called later in get/post?
Here is what i have so far (slightly altered for this question):
class CourseUpdateView(UpdateView):
def dispatch(self, request, *args, **kwargs):
self.request = request
self.kwargs = kwargs
self.object = self.get_object()
if self.object.is_online:
messages.warning(request, "Sorry this one can't be updated")
return redirect("course:detail", pk=self.kwargs['pk'])
# this is going to call self.get_object again isn't it?
return UpdateView.dispatch(self, request, *args, **kwargs)
解决方案
You can cache the result of get_object()
.
Here's a trivial example:
class CourseUpdateView(UpdateView):
# [...] your dispatch method
def get_object(self):
# it doesn't matter how many times get_object is called per request
# it should not do more than one request
if not hasattr(self, '_object'):
self._object = super(CourseUpdateView, self).get_object()
return self._object
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