Django - Get parent object with children's object - django

Question

I'm new to Django so I might miss the answer for this one because of terminology.
I am trying to get parent object with children objects, I've got:
#models.py
class Category(models.Model):
name = models.CharField(max_length=255)
sub_category = models.ForeignKey(SubCategory)
title = models.CharField(max_length=255, null=True)
#serializer.py
class CategorySerializer(serializers.ModelSerializer):
class Meta:
model = Category
fields = '__all__'
#views.py
Product.objects.all().filter(sub_category__category_id=category_id).select_related()
products_serializer = ProductSerializer(products, many=True)
return Response({
'data': products_serializer.data
})
I am trying to get parent category object within the children objects I've already got.
Thanks in advance :)

Answer 1

You already have your parent object, you can access it through each of your objects:
products = Product.objects.all().filter(sub_category__category_id=category_id)
for product in products:
parent = product.parent # You already have it
For better performance change your query to
Product.objects.all().filter(sub_category__category_id=category_id).select_related('parent')
As commented you can do it through serializers:
class ProductItemSerializer(serializers.ModelSerializer):
class Meta:
model = ProductItem
class ProductSerializer(serializers.ModelSerializer):
product_items = ProductItemSerializer(many=True, read_only=True)
class Meta:
model = Product
class CategorySerializer(serializers.ModelSerializer):
products = ProductSerializer(many=True, read_only=True)
class Meta:
model = Category
Now just get categories and products and items will be nested