Django 精确查找的QuerySet值必须限制为使用切片的一个结果。过滤错误

我不能过滤相同的slug值。问题是，我需要两个相同的鼻涕虫类型，我不知道如何修复它。我有两个带有slug（kind）>“silikonovyj chehol”的产品，我尝试对其进行过滤，但有一个

用于精确查找的QuerySet值必须限制为使用切片的一个结果。

视图.py

def product_list(request, category=None, subcategory=None, kind=None):
    if category:
        category = Category.objects.get(slug=category)
        categories = Category.objects.all()
        subcategories = Subcategory.objects.filter(category=category)
        products = Product.objects.filter(category=category, available=True)

        kinds = None
        if subcategory:
            subcategory = Subcategory.objects.get(slug=subcategory)
            kinds = Kind.objects.filter(kind=subcategory)
            products = Product.objects.filter(category=category, subcategory=subcategory, available=True)

            if kind:
                kind = Kind.objects.filter(slug=kind) # ERROR IT'S HERE
                products = Product.objects.filter(category=category, subcategory=subcategory, kind=kind, available=True)

        context = {
            'categories':categories,
            'category':category,
            'subcategories':subcategories,
            'subcategory':subcategory,
            'products':products,
            'kinds':kinds,
        }

        return render(request, 'shop/product/product_list.html', context)
    else:
        categories = Category.objects.all()
        products = Product.objects.filter(available=True)
        context = {'categories':categories, 'products':products}
        return render(request, 'shop/product/product_list.html', context)

class Category(models.Model):
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)

class Subcategory(models.Model):
    category = models.ForeignKey(Category, on_delete=models.PROTECT)
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)

class Kind(models.Model):
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)
    kind = models.ForeignKey(Subcategory, on_delete=models.PROTECT)

class Product(models.Model):
    category = models.ForeignKey(Category, on_delete=models.PROTECT)
    subcategory = models.ForeignKey(Subcategory, on_delete=models.PROTECT)
    kind = models.ForeignKey(Kind, on_delete=models.PROTECT)
    name = models.CharField(max_length=200, db_index=True)

产品列表.html

{% if subcategory %}
    {% for kind in kinds %}
        <a href="{% url 'shop:lst_by_knds' category.slug subcategory.slug kind.slug %}">{{ kind.name }}</a>
    {% endfor %}
{% endif %}

型号.py

def product_list(request, category=None, subcategory=None, kind=None):
    if category:
        category = Category.objects.get(slug=category)
        categories = Category.objects.all()
        subcategories = Subcategory.objects.filter(category=category)
        products = Product.objects.filter(category=category, available=True)

        kinds = None
        if subcategory:
            subcategory = Subcategory.objects.get(slug=subcategory)
            kinds = Kind.objects.filter(kind=subcategory)
            products = Product.objects.filter(category=category, subcategory=subcategory, available=True)

            if kind:
                kind = Kind.objects.filter(slug=kind) # ERROR IT'S HERE
                products = Product.objects.filter(category=category, subcategory=subcategory, kind=kind, available=True)

        context = {
            'categories':categories,
            'category':category,
            'subcategories':subcategories,
            'subcategory':subcategory,
            'products':products,
            'kinds':kinds,
        }

        return render(request, 'shop/product/product_list.html', context)
    else:
        categories = Category.objects.all()
        products = Product.objects.filter(available=True)
        context = {'categories':categories, 'products':products}
        return render(request, 'shop/product/product_list.html', context)

class Category(models.Model):
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)

class Subcategory(models.Model):
    category = models.ForeignKey(Category, on_delete=models.PROTECT)
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)

class Kind(models.Model):
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)
    kind = models.ForeignKey(Subcategory, on_delete=models.PROTECT)

class Product(models.Model):
    category = models.ForeignKey(Category, on_delete=models.PROTECT)
    subcategory = models.ForeignKey(Subcategory, on_delete=models.PROTECT)
    kind = models.ForeignKey(Kind, on_delete=models.PROTECT)
    name = models.CharField(max_length=200, db_index=True)

或者，如果我改变这一行，我已经

get（）返回了不止一种——它返回了2！错误

if kind:
   kind = Kind.objects.get(slug=kind)

这：

应为：

products = Product.objects.filter(category=category, subcategory=subcategory, kind=kind[0], available=True)

如果要基于一种进行筛选

或：

如果要对上面返回的所有

kind

对象过滤

产品

products = Product.objects.filter(category=category, subcategory=subcategory, kind=kind[0], available=True)

products = Product.objects.filter(category=category, subcategory=subcategory, kind__in=kind, available=True)