Connect nested models django rest framework API serializer - django

Question

I want to achieve this: a API to get all products for a category.
Models.py
class Category(models.Model):
main_category = models.CharField(max_length=200, default = '')
def __str__(self):
return '%s' % (self.main_category)
class Subcategory(models.Model):
category = models.ForeignKey(Category, on_delete=models.CASCADE)
sub_category = models.CharField(max_length=200, default = '')
def __str__(self):
return '%s' % (self.sub_category)
class Products(models.Model):
sub_category = models.ForeignKey(Subcategory, on_delete=models.CASCADE)
product_name = models.CharField(max_length=200, default = '')
def __str__(self):
return '%s' % (self.product_name)
Views.py
class ProductCategoryFilter(django_filters.FilterSet):
category = django_filters.CharFilter(name="category__main_category")
class Meta:
model = Products
fields = ['category']
class ProductCategoryListAPIView(ListAPIView):
queryset = Products.objects.all()
serializer_class = ProductCategorySerializer
filter_class = ProductCategoryFilter
Serializers.py
class ProductCategorySerializer(ModelSerializer):
#category_name = serializers.CharField(source='category.main_category')
category_name = CategorySerializer(source='category_set')
class Meta:
model = Products
fields = [
'category_name',
'product_name',
]
AttributeError at /api/productcategories/
I get AttributeError when attempting to get a value for field category_name on serializer ProductCategorySerializer. The serializer field might be named incorrectly and not match any attribute or key on the Products instance.
Original exception text was: 'Products' object has no attribute 'category'.
And I want the output like this:
[
{
"category_name": "main category 1",
"product_name": "product 1"
},
{
"category_name": "main category 1",
"product_name": "product 2"
},..........
OR output like this :
[
{
"main category 1" :{ "product 1", "product 2"...}