form_invalid的FormView设置上下文

Question

如果表单无效，我试图为上下文赋值。这就是我在做的事情。但是如果表单无效，我的回答很奇怪而且我没有得到表格。

{'key': 'Val', 'form': <MainLoginForm bound=True, valid=True, fields=(user_name;user_category;user_password)>, u'view': <mainApp.views.MainLoginFormView object at 0x107553c10>}  Submit

这是班级

class MainLoginFormView(FormView):
    template_name = 'login.html'
    form_class = MainLoginForm
    success_url = "login.hrml"
    args = {}

    def ValidateAccount(self,form):
        if(valid) #Some Condition to confirm if valid form 
            return super(MainLoginFormView, self).form_valid(form)
        else:
            return self.form_invalid(form)


    def form_invalid(self, form):
        MainLoginFormView.args = super(MainLoginFormView, self).get_context_data(**MainLoginFormView.args)
        MainLoginFormView.args["key"] = "Val"
        MainLoginFormView.args["form"] = form
        #return self.render_to_response(context=MainLoginFormView.args)
        return super(MainLoginFormView,self).form_invalid(MainLoginFormView.args)

    def form_valid(self, form, **kwargs):
        MainLoginFormView.args = kwargs
        .....
        return self.ValidateAccount(form)

Answer 1

form_invalid方法仅作为输入形式。您可以覆盖它以满足您的要求，如下所示：

你应该将args重命名为kwargs

def form_invalid(self, form):   
    # Do your your stuff here , 
    MainLoginFormView.kargs["key"] = "Val"
    MainLoginFormView.kargs["form"] = form
    return self.render_to_response(self.get_context_data(**MainLoginFormView.kargs))

Answer 2

它似乎有点奇怪，但建议将更新响应上下文的责任委托给get_context_data方法。

def get_context_data(self, **kwargs):
    form = kwargs.pop('form', None)  # form becomes None if no form key is provided
    ctx = super(MainLoginFormView, self).get_context_data(form=form)  # This super call will append the form to our context
    ctx.update(**kwargs)  # Let's append the extra_args to our context
    return ctx

def form_invalid(self, form, **kwargs):
    # in order to work, the super call to get_context_data needs a form item
    kwargs.update({'form': form})
    return self.render_to_response(self.get_context_data(**kwargs))

def ValidateAccount(self, form):
    if(valid):  # A condition to confirm whether the form is valid or not 
        return super(MainLoginFormView, self).form_valid(form)
    else:
        extra_args = {
            'key': 'Val'
        }
        return self.form_invalid(form, **extra_args)

注意：{'key': 'Val'}附加在ValidateAccount方法中。