set user object id after created

app/models.py

@@ -268,6 +268,7 @@ class User(db.Model):
             user = User(username=self.username, firstname=self.firstname, lastname=self.lastname, role_id=self.role_id, email=self.email, password=self.get_hashed_password(self.plain_text_password))
             db.session.add(user)
             db.session.commit()
+            self.id = user.id
             return True
         except Exception, e:
             raise