我应该如何在函数视图中调用基于类的通用视图

Question

我想在函数视图中调用基于类的索引视图 我在登录函数视图中渲染索引模板，但是当我在索引模板中添加一个额外的上下文时，我从函数视图'它只渲染了额外的上下文，而不是已经由基于类的索引视图渲染的上下文。

所以我想我是否可以从函数中调用基于类的索引视图，以便我向基于类的视图添加额外的上下文并同时渲染它。

简而言之，我想从函数视图中添加额外的上下文并渲染它。

这是我的基于类的通用视图，用于在索引模板中列出对象。

class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    title = 'hello'
    num_visit = 'a'
    context_object_name = 'question_list'

    def get_queryset(self):
        """Return the last five published questions."""
           return Question.objects.filter(pub_date__lte=timezone.now()).order_by('-pub_date')[:5]

这是我的登录视图，它与基于类的索引视图所呈现的模板相同

def login_view(request):
    user = authenticate(request,username=request.POST['username'],password=request.POST['password'])
    if user is not None:
        login(request, user)
        return redirect('polls:index')
    return render_to_response('polls/index.html', {'error_message': 'wrong credentials'})

.................................................. ..

现在我可以登录索引模板，但查看添加的代码上下文不起作用，也许它起作用了，但我认为它确实与默认对象列表上下文混淆了。

class IndexView(generic.ListView):
template_name = 'polls/index.html'
title = 'sdasd'
num_visit = 'a'
context_object_name = 'question_list'
error_message = None

def get_queryset(self):
    """Return the last five published questions."""
    return Question.objects.filter(pub_date__lte=timezone.now()).order_by('-pub_date')[:5]

def post(self, request, **kwargs):
    user = authenticate(request, username=request.POST['username'], password=request.POST['password'])
    if user is not None:
        login(request, user)
        return redirect('polls:index')
    error_message = 'i love jesus'
    context = self.get_context_data(request, error_message, **kwargs)
    return render(request, 'polls:index', context)



def get_context_data(self, *args, **kwargs):
    context = super(IndexView, self).get_context_data(**kwargs)
    context['error_message'] = self.args
    return context

模板代码....... 无法添加模板代码'这很复杂我在这里添加 https://codeshare.io/5zXYJb

引用错误https://ibb.co/jdA7Ek

Answer 1

您不应该将逻辑从一个视图调用到另一个视图。创建登录逻辑。你没有发布任何代码，所以我不太确定你的程序是如何工作的，但你可以这样做：

在forms.py中

class MyLoginForm(Form):
    username = forms.TextField(...)
    password = forms.PasswordField(...)

在 utils.py 中

def login(request, user_name, password):
    user = authenticate(request, username=user_name, password=password)
    if user is not None:
        login(request, user)
        return True
    return False

def index_context(...):
    context = {}
    # do context stuff here
    return context

在views.py中

class Index(View):
    def post(self, request, *args, **kwargs):
        # The logging_in part is optional but it's used to know when a post request is a login post or for something else. Just add a hidden field in your login form that has this name and a value of True.
        if request.POST.get("logging_in", False):
            authenticated = utils.login(request, request.POST.get("username", ""), request.POST.get("password", ""))

            if authenticated:
                # refresh the page
            else:
                # refresh the page with error
        else:
            # do other POST actions.

    def get(self, request, *args, **kwargs):
        # add a username and password form to context along with whatever other context you need.
        context = utils.index_context(...)
        context["login_form"] = MyLoginForm
        return render(request, "index.html", context)

def login_view(request):
    # Used if you also want a separate login page too.
    if request.method == "POST":
        loggedin = utils.login(request, request.POST.get("username", ""), request.POST.get("password", ""))
        if loggedin:
            return redirect('polls:login')
        return render_to_response('polls/login.html', {'error_message': 'wrong credentials'})
    else:
        # render template with username and password field
        context = {}
        context["login_form"] = MyLoginForm
        return render(request, "login.html", context)

您也可以只拥有一个 API 视图，该视图仅用于登录内容并让 ajax 调用此视图。无论哪种方式，登录的实际逻辑都应该在一个单独的全局函数中。