DRF: a way to use default UserProfile field in serializer?

Question

Using current User model in your serializers is easy:

user = serializers.PrimaryKeyRelatedField(
        read_only=True,
        default=serializers.CurrentUserDefault()
    )

but what if I have my own UserProfile model and I want to use current UserProfile in a serializer.

Just doing CurrentUserDefault().profile does not work, of course because at this point this is an empty object.

Answer 1

It turns out this problem is very easily solved. If you look at the source code of CurrentUserDefault class, you will see it is very simple:

class CurrentUserDefault(object):
    def set_context(self, serializer_field):
        self.user = serializer_field.context['request'].user

    def __call__(self):
        return self.user

    def __repr__(self):
        return unicode_to_repr('%s()' % self.__class__.__name__)

I guess set_context is called by Serializer , and then __call__ method called to recieve the object. So it is very simple to rewrite this code in any way you want.

TLDR

Just add this somewhere:

class CurrentUserProfileDefault(serializers.CurrentUserDefault):
    def __call__(self):
        return self.user.userprofile

And where ever you need your profile just write:

user_profile = serializers.PrimaryKeyRelatedField(
        read_only=True,
        default=serializers.CurrentUserProfileDefault()
    )