FastAPI+React+DockerでQiitaみたいなサイトを作ってみたい -7日目- - Qiita

# ~~~ from sqlalchemy.orm import relationship,validates # ~~~ @validates("login_id") def check_user_login_id(self,key,v): if v == None: raise ValueError("LoginId must not be null") if v == "": raise ValueError("LoginId must not be empty string") if not v.replace('-','').replace('_','').isalnum(): raise ValueError("LoginId can only contain letters, numbers, _, and -") if v[0] == "-" or v[0] == "_":