Type error to create and update my list in django rest framework

Question

I\'m trying to use my api to create and update products in a bundle. I did so:

model.py

class Business(models.Model):
    name = models.CharField(max         


        

Answer 1

If you are making post via BundleSerializer you need to pass products with list of ProductSerializer data not just id since products in BundleSerializer is accepting productsSerializer data. You are getting type error 'name' is an invalid keyword argument for this function" because your validated_data contain name and BundleProduct object Does not have name field.And you are creating BundleProduct objects with validated_data.

Create bundle object and pass id of bundle object to BundleProduct object.

• If you do not want to create product and just pass existing product id you need to make ListField

• You need to Override get_fields and check the requests

• override to_representation to return always List of ProdutSerializer Data
• Override create for POST request
• Override update for PUT and PATCH Request

Below is solution for POST Request

For PATCH AND PUT Request you need to override update method of ModelSerializer and handle the products accordingly.

class BundleSerializer(serializers.ModelSerializer):

    def create(self, validated_data):
        products = validated_data.pop('products')
        bundle = Bundle.objects.create(**validated_data)
        for product_id in products:
            product = get_object_or_404(Product, pk=product_id)
            BundleProduct.objects.create(product=product, bundle=bundle)
        return bundle

    class Meta:
        model = Bundle
        fields = "__all__"

    def to_representation(self, instance):
        repr = super().to_representation(instance)
        repr['products'] = ProductSerializer(instance.products.all(), many=True).data
        return repr

    def get_fields(self):
        fields = super().get_fields()
        if self.context['request'].method in ['POST', "PATCH","PUT"]:
            fields['products'] = serializers.ListField(
                write_only=True,
                child=serializers.IntegerField()
            )
        return fields

sample POST data to BundleSerializer

{
    "products":[1,2],
    "name":"Offer One",
    "description":"description",
    "price":1212,
    "business":1

}