Dealing with mandatory ForiegnkeyField for fields that is not in django rest framework serializers

Although I am big fan of django rest framework but sometime i feel it is gruesome to deal with nested serializers (Maybe I am doing something wrong, feel free to suggest me your favourite trick.)

Suppose we have two models, ASerializer is based on A model, BSerializer is based on `B` model. A and B models are related, say B has a foreign key to A. So while creating B it is mandatory to define A but A serializer is full of so much data that I don’t want to have that unnecessary overhead at my BSerializer, but when creating B I must have it. Here how I solved it:

For the sake of brevity let’s say A is our Category, and B is Product. Every Product has a Category, so Product has a foreign key of Category, but I am not making it visible at ProductSerializer given that category has a lot of unnecessary information that is not necessary.

from django.shortcuts import get_object_or_404
class ProductSerializer(serializers.ModelSerializer):
    def to_internal_value(self, data):
        if data.get('category'):
            self.fields['category'] = serializers.PrimaryKeyRelatedField(

            cat_slug = data['category']['slug']
            cat = get_object_or_404(Category, slug=cat_slug)

        return super().to_internal_value(data)

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