How to fetch the all the data(records) which is searched (like : we are getting a slug from frontend),with Latest updated date

class A:
    some fields
class B:
    user = models.ForeignKey(User, **CASCADE, related_name='sessions')
    DEVICES = (
        ('android', 'android'),
        ('ios', 'ios')
    )

We are creating a dashboard for front end and there is a search field, user supposed to type the device_type and we used to fetch the records who uses only the IOS or Android.
In this Case the records is stored in the fields like, Created_at, updated_at, device_type, user_id... we need to apply two filters now here:

1. searched_key : ios or android
2. latest_device_type : only latest updated_record

I have done like :

User.objects.filter(Q(id=user_details['id']) & Q(sessions__device_type=self.search_key) & Q(reduce(or_, self.query_filter))).order_by('sessions__user_id', '-sessions__created_at').distinct('sessions__user_id'). \
                  values('id', 'sessions__device_type', 'first_name')

But am not getting exact output : even i tried [0] putting this after order_by and latest() and first() method will fetch only one record so any 1 has the best solution for this. Note : if anybody try to explain with Prefetch please explain with clarity.