相关疑难解决方法(0)

我想根据网址中的类别ID过滤子类别

对于恒定值，它可以正常工作

return Subcategory.objects.filter(category = 1)

views.py

class SubcategoriesListView(ListView):
    model = Subcategory
    template_name = 'app/categories/index.html'
    def get_queryset(self):
        return Subcategory.objects.filter(category = category_id)

urls.py

path('categories/<int:category_id>/', app.views.SubcategoriesListView.as_view(), name='subcategories'),

models.py

class Subcategory(models.Model):
   title = models.CharField(max_length=30)
   category = models.ForeignKey(Category, on_delete=models.CASCADE)

追溯

/ categories / 1 /处的NameError未定义名称'category_id'

get_queryset中的views.py返回Subcategory.objects.filter（category = category_id）