如何为每个用户只提交一次表单的Flask应用程序创建自定义WTforms验证器

from wtforms import ValidationError
from wtforms.validators import StopValidation

class UniqueFormValidator(object):
    def __init__(self, message=None):
        if not message:
            message = '该表单已经提交过了'
        self.message = message

    def __call__(self, form, field):
        # 在这里实现验证逻辑
        # 检查表单是否已经提交过了
        if form.is_submitted():
            # 如果已经提交过了，抛出验证错误
            raise ValidationError(self.message)
        else:
            # 如果还没有提交过，将表单标记为已提交
            form._submitted = True
            # 继续验证其他规则
            raise StopValidation()

from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired

class MyForm(FlaskForm):
    name = StringField('姓名', validators=[DataRequired(), UniqueFormValidator()])
    submit = SubmitField('提交')

pip install Flask-WTF WTForms