Django custom Authentication Backend

[ahmadyosr]

Hello everyone 

I've been trying to create a custom Authentication Backend in Django , It worked .. And it returns an authenticated user and It Logs-in successfuly, 

BUT , whenever I refresh the page or move for another page it just logout ! it doesn't stuck logged in . 
here's the backend snap : 

from django.contrib.auth.models import User

class SBAT(ModelBackend):

def authenticate(self, username=None, id=None):

try :

user = User.objects.get(username= username)

if user.id  == id :

return user

except :

return None 

def get_user(self ,user_id ):

try :

user = User.objects.get(pk=user_id)

except : 

return None 

the login view 

....       
        profile_name = profile_data['name']

profile_id = profile_data['id']

try :   

user = User.objects.get(username=profile_name+profile_id[:3])

except : 

user = User.objects.create_user(username=profile_name+profile_id[:3], id = int(profile_id))

        user = authenticate(username=user.username , id = int(profile_id) )

login(request,user)

        return render(request,'index.html')

It Login successfully but logout whenever I get out of the current page . 

Thanks in advance