Cfrgtkky

I'm getting the following error when posting a new Product to my application

Traceback (most recent call last):

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner

    response = get_response(request)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response

    response = self.process_exception_by_middleware(e, request)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response

    response = wrapped_callback(request, *callback_args, **callback_kwargs)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view

    return view_func(*args, **kwargs)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/viewsets.py", line 116, in view

    return self.dispatch(request, *args, **kwargs)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/views.py", line 495, in dispatch

    response = self.handle_exception(exc)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/views.py", line 455, in handle_exception

    self.raise_uncaught_exception(exc)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/views.py", line 492, in dispatch

    response = handler(request, *args, **kwargs)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/mixins.py", line 20, in create

    serializer.is_valid(raise_exception=True)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 236, in is_valid

    self._validated_data = self.run_validation(self.initial_data)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 434, in run_validation

    value = self.to_internal_value(data)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 488, in to_internal_value

    validated_value = field.run_validation(primitive_value)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 623, in run_validation

    value = self.to_internal_value(data)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 662, in to_internal_value

    validated = self.child.run_validation(item)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 436, in run_validation

    self.run_validators(value)

  File "/mnt/c/Users/connect/Desktop/PIM/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 465, in run_validators

    to_validate.update(value)

TypeError: 'Category' object is not iterable

my serializer.py

from rest_framework import serializers

from products_and_categories.models import Product, Category

from django.db import models



class CategorySerializer(serializers.ModelSerializer):

    class Meta:

        model = Category

        fields = ('id', "name", 'products', 'categories')



    def to_representation(self, obj):

        if 'categories' not in self.fields:

            self.fields['categories'] = CategorySerializer(obj, many=True)      

        return super(CategorySerializer, self).to_representation(obj)



    def to_internal_value(self, data):

        try:

            try:

                obj_id = data['id']

                return Category.objects.get(id=obj_id)

            except KeyError:

                raise serializers.ValidationError(

                    'id is a required field.'

                )

            except ValueError:

                raise serializers.ValidationError(

                    'id must be an integer.'

                )

        except Category.DoesNotExist:

            raise serializers.ValidationError(

            'Obj does not exist.'

            )





class ProductSerializer(serializers.ModelSerializer):

    categories = CategorySerializer(many=True)#, queryset= Category.objects.all(), slug_field='categories')



    class Meta:

        model = Product

        fields = ('id', "product_code", "name", "quantity", "price", 'categories')

        #.....

Any idea why this is happening ?

I don't quiet understand what it means by it's not iterable, what part of the code exactly is causing this error?

I would really appreciate any help

the post is in the following format

{

"id": 22,



"product_code": "dklj",



"name": "kdlj",



"quantity": 15,

"price": 15,

"categories": [ {

    "id": 5,

    "name": "Test category 3",

    "products": ,

    "categories": 

}]

}

Here:
self.fields['categories'] = CategorySerializer(obj, many=True)

You're telling CategorySerializer to prepare for a list of categories but you're only passing one.