Profiles/Articles Serializers 

In the Profiles and Articles serializers the parenthesis should be removed on the code below:

`if not request.user.is_authenticated():` 

You are using as a function, according to the [docs](https://docs.djangoproject.com/en/4.0/ref/contrib/auth/#django.contrib.auth.models.User.is_authenticated) is_authenticated is an attribute not a method.

`if not request.user.is_authenticated:` 