Question

我试图调用此代码中的最后一个函数（def get_level_msg（）：）

   class ProductDetailView(ProductView):
model = EnrollableTemplate

@functional.cached_property
def location(self):
    return get_object_or_404(
        Location.actives, slug=self.kwargs['location_slug'])

def get_object(self):
    return get_object_or_404(
        EnrollableTemplate, slug=self.kwargs['product_slug'])

def get_template_names(self):
    if self.get_object().category.language:
        return 'pdp_language.html'
    return 'immersion_pdp.html'

def get_faqs(self):
    object = self.get_object()
    if object.is_workshop:
        return c.faqs['workshop']
    elif object.category.language:
        return c.faqs['language']
    else:
        return c.faqs['immersion']

def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)
    template = kwargs[self.context_object_name]

    # only display upcoming classes that have open seats available
    courses = (template.enrollable_set
               .upcoming()
               .select_related('template', 'venue__location')
               .filter(venue__location=self.location)
               .order_by('start_date'))

    loc_filter = self.request.GET.get('neighborhood')
    context['language'] = language = template.category.language

    if not self.object.is_workshop:
        sessions = [enrollable.session_count for enrollable
                    in self.object.enrollable_set.upcoming()]
        if sessions:
            context['max_sessions'] = max(sessions)

    neighborhoods = (Venue.objects.filter(location=self.location)
                                  .filter(enrollable__in=courses)
                                  .distinct()
                                  .values_list('neighborhood', flat=True))
    if loc_filter:
        courses = courses.filter(course__venue__neighborhood=loc_filter)
        context['filtered'] = True

    location_filters = [('?neighborhood={}'.format(n), n) for
                        n in neighborhoods.iterator()]
    path = urlparse(self.request.get_full_path()).path
    location_filters.insert(0, ('{}#filter'.format(path), "all"))
    context['filters'] = [('Location', location_filters)]

    if language:
        context['featured_teachers'] = self.get_featured_teachers(
            self.location, language)
    else:
        try:
            context['featured_teachers'] = [courses[0].teacher]
        except IndexError:
            context['featured_teachers'] = None

    context['expectations'] = template.expectation_set.all()
    context['faqs'] = self.get_faqs()
    context['courses'] = courses
    context['template_id'] = template.id
    # import ipdb; ipdb.set_trace()
    if courses.exists():
        course = courses[0]
        days_per_week = sum(1 for x in course.schedule if x is True)
        if days_per_week == 1:
            days_per_week = 'once'
        elif days_per_week == 2:
            days_per_week = 'twice'
        else:
            days_per_week = 'every day'
        context['days_per_week'] = days_per_week


    weeks = (course.start_date - course.end_date).days
    context['weeks_per_course'] = abs(int(weeks / 7))
    context['has_book'] = course.template.books.count() > 0
    context['first_start_date'] = course.start_date
    context['hello'] = template.level
    level_message1 = "Beginner Course"
    level_message2 = "Intermediate Course"
    level_message3 = "Advanced Course"
    level_message4 = "Beginner Intensive"

    # context['get_level_msg'] = 
    def get_level_msg():
        if template.level == 1:
            return level_message1
        elif template.level == 2:
            return level_message1
        elif template.level == 3:
            return level_message1
        elif template.level == 4:
            return level_message2
        elif template.level == 5:
            return level_message2
        elif template.level > 5:
            return level_message3
        else:
            return level_message4

进入此HTML模板

    <h4 class="t2">{{ weeks_per_course }} WEEK {{ ProductDetailView.get_level_msg }}<!-- BEGINNER INTENSIVE --></h4>

使用我在网上找到的示例，它说我应该首先使用该模型，在这种情况下是它的ProductDetailView。我进入django 3天后仍然不明白该怎么做！有人可以帮我得出结论吗？谢谢！

Answer 1

我根本不明白为什么你想要一个函数，或者为什么要从模板中调用它。此值仅取决于get_context_data内的其他值;你应该在该方法中使用基本的if语句。

...
level_message1 = "Beginner Course"
level_message2 = "Intermediate Course"
level_message3 = "Advanced Course"
level_message4 = "Beginner Intensive"

if template.level == 1:
    lvl = level_message1
elif template.level == 2:
    lvl = level_message1
elif template.level == 3:
    lvl = level_message1
elif template.level == 4:
    lvl = level_message2
elif template.level == 5:
    lvl = level_message2
elif template.level > 5:
    lvl = level_message3
else:
    lvl = level_message4

context['get_level_msg'] = lvl

现在，您可以直接在模板中引用{{ get_level_msg }}，就像处理其他任何值一样。

（我怀疑template实际上是你所期望的，甚至根本不存在;我怀疑你应该使用self.object。）

Answer 2

我意识到我没有正确地解决这个问题，这就是我要解决的问题：

t_level = template.level

    if t_level == 1:
            t_level = level_message1
    elif t_level == 2:
            t_level =  level_message1
    elif template.level == 3:
            t_level = level_message1
    elif template.level == 4:
            t_level = level_message2
    elif template.level == 5:
            t_level = level_message2
    elif template.level == 6:
            t_level = level_message3
    elif template.level == 7:
            t_level = level_message3
    else:
            t_level = level_message4
    context['t_level'] = t_level

我实际上是把它作为一个函数，这是没有必要的，所以我重写了它，所以我可以用上下文将它调用到我的模板中

<h4 class="t2">{{ weeks_per_course }} WEEK {{ t_level }}</h4>

从django HTML模板调用Django视图函数

2 个答案: