django return self.request.user.longueur into an integervalue and do some operations

i have in my models  :

class User(AbstractUser):

        ...

       ...

      longueur =models.IntegerField(null=True, blank=True)

and i want in my views :

 

 when the user is logged to get his 'longueur ' in integer form and do some operations.

like

  u=User.objects.get(username=self.request.user)

        

        longitude = u.longitude  in integer form

     my console show me None 

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