'我开始使用基于类的视图，但是当我使用基于类的视图时，我最初编写的代码不能在模板中呈现。main_c.main_categories.url，main_c.name中的数据，（参见模板）在我使用基于类的视图时根本不会显示。当我改回基于函数的视图并刷新页面时，模板中的HTML代码显示没有任何问题。有人能解释一下是什么原因导致这个错误吗？我读过一些关于模板找不到上下文的文章，但我真的不明白这意味着什么，以及上下文如何解决这个问题。
先谢谢你！
views.py

class MainCategoryDeleteView(DeleteView):
    model = MainCategory
    success_url = reverse_lazy("main_category")
    template_name = 'admin_dashboard/categories/maincategory_confirm_delete.html'

class MainCategoryUpdateView(UpdateView):
    model = MainCategory
    fields = '__all__'
    success_url = reverse_lazy("main_category")
    template_name = 'admin_dashboard/categories/main_category_edit.html'

class MainCategoryCreateView(CreateView):
    model = MainCategory
    fields = '__all__'
    success_url = reverse_lazy("main_category")
    template_name = 'admin_dashboard/categories/main_category.html'

    def get_context_data(self, **kwargs):
        context = super(MainCategoryCreateView, self).get_context_data(**kwargs)
        context['main_categories'] = MainCategory.objects.all()
        print(MainCategory.objects.all())
        return context

urls.py

path('BaitSouq/MainCategory/', views.MainCategoryCreateView.as_view(), name="main_category"),
path('BaitSouq/MainCategory/<int:pk>/Delete/', views.MainCategoryDeleteView.as_view(), name="main_category_delete"),
path('BaitSouq/MainCategory/<int:pk>/Change/', views.MainCategoryUpdateView.as_view(), name="main_category_update"),

模板

<div class="col-lg-2 d-none d-lg-flex">
    <div class="categories-dropdown-wrap style-2 mt-30">
        <div class="d-flex categori-dropdown-inner" style="font-size: x-small">
            <ul>
                {% for main_c in main_categories %}
                    <li>
                        <a href="#"> <img
                                src="{{ main_c.main_categories.url }}"
                                alt=""/>{{ main_c.name }}</a>
                    </li>
                {% endfor %}

            </ul>
        </div>
    </div>
</div>

This is Template folder