Expanded serializer

gistfile1.py

class BookSerializer(serializers.ModelSerializer):
    
    class Meta:
        model = Book
        fields = ['title', 'author']


class ExpandedBookMixin(object)
    books = BookSerializer(many=True)


class UserSerializer(serializers.ModelSerializer):
    
    class Meta:
        model = User
        fields = ['first_name', 'books']


class ExpandedUserSerializer(BookSerializer, UserSerializer):
    pass
    

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