RetrieveAPIView get by related field!

[AhmadM-DL]

Hello consider the following simple scenario:

class User(models.Model):
     email = ...
     fname = ...
     lname = ...

class UserPreferences(models.Model):
     user = models.OneToOneField(User, to_field="email", ...)
     preferences = ...

Now the UserPreferences table in the db contains id, preferences, user_id.
I want to get the preferences of a user by email.
I want to use RetrieveAPIView.
How to do this?