Flask在多个领域进行WTform验证

Question

基于两个或更多条目验证WTform的最佳方法是什么？即在下面的表格中，我想验证数据库中是否已存在具有提供的名称和地址的公司。

class CompanyForm(FlaskForm):
    name=StringField('Company Name', validators=[DataRequired()])
    address=StringField('Street Address', validators=[DataRequired()])

像这样......

    def validate_name(self, name, address):
        company = Company.query.filter_by(name=name.data, address=address.data).first()
        if company is None:
            raise ValidationError('This company already exists in our database.')

我通读了关于S.O.的文件和类似问题。但我仍然无法弄明白。

Answer 1

试试这样的东西..（片段here的修订版）

class CompanyForm(FlaskForm):
    name = StringField('Company', [validators.DataRequired()])
    address = StringField('Street Address', [validators.DataRequired()])

    def validate(self):
        rv = FlaskForm.validate(self)
        if not rv:
            return False

        company = Company.query.filter_by(name=self.name.data, address=self.address.data).first()
        if company is not None:
            self.name.errors.append('Company already exists at that address')
            return False

        return True