docs: def find_by_username(self, username):
          """Return user by username if find in database otherwise None"""
          data = (db.select(self.table).select('username', 'email', 'real_name',
                                               'password', 'bio', 'status', 'role', 'uid').
                  condition('username', username).execute()
                  )
          if data:
              return self.load(data[0], self.model)