Users can log in iff they are or were a member, don't display the database to everyone

users/models.py

@@ -83,6 +83,9 @@ class User(AbstractUser):
                 date_end=membership_dict['date_end'],
             )
 
+        # Only members or old members are allow to connect to the website
+        self.is_active = Membership.objects.filter(user=self).exists()
+
 
 class Membership(models.Model):
     user = models.ForeignKey(