Python django.core.exceptions.FieldError:无法解析关键字'；slug'；到田野里去。选择包括： #models.py class Category(models.Model): title = model

django.core.exceptions.FieldError:无法解析关键字'；slug'；到田野里去。选择包括：

#models.py
class Category(models.Model):

    title = models.CharField(verbose_name='TITLE', max_length=200)
    slug = models.SlugField('SLUG', unique=True, allow_unicode=True, help_text='one word for title alias.')
    ...

class Episode(models.Model):

    category = models.ForeignKey("Category", verbose_name=("CATEGORY"), on_delete=models.CASCADE)
    number = models.IntegerField()
    ...

    class Meta:
        ...
    def __str__(self):
        ...

    def get_absolute_url(self):
        return reverse("manga:episode_detail", kwargs={"slug": self.category.slug, "number": self.number})
#urls.py
...
path("category/<korslug:slug>/", views.CategoryDetailView.as_view(), name="category_detail")
path("category/<korslug:slug>/<int:number>/", views.EpisodeDetailView.as_view(), name="episode_detail"),

#views.py
# ...
class EpisodeDetailView(DetailView):
    model = Episode

query_pk_and_slug = True
    def get_queryset(self):
        return Episode.objects.filter(category__slug=self.kwargs['slug'])