[Django]-KeyError on relation field in Django-REST

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You are accessing the data in a wrong way. You should access .validated_data on the serializer instead of .data.

m = CartSerializer(data=inputdata)
if m.is_valid():
    items = m.validated_data # access validated data here

Why serializer.data approach did not work for your case?

When you are doing .data, the serializer will try to serialize the initial_data as you have not passed the instance argument. It will expect all the fields to be present but since cart_color is not present on the data, it will raise a KeyError.

When should you generally use serializer.data then?

You should generally use serializer.data when you are serializing an existing object. This would require you to pass an instance argument when creating an instance of the serializer.

m = CartSerializer(instance=my_object)
items = m.data # use .data when serializing an object
👤Rahul Gupta

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