Flask WTForms 自定义验证器不工作

Question

此自定义验证器应检查 2 个数据库，以查看在表单中输入的值是否等于名为 training_name 和日期的列中的值。但是，如果我输入数据库中存在的重复记录，则不会出现任何错误。请指教

class add_training_form(FlaskForm): #All fields are required
    training_course = SelectField('Training Course', choices=[], validators=[DataRequired()]) #The choices will be assigned in route
    training_provider = SelectField('Training Provider', choices=[], validators=[DataRequired()])
    date = DateField('Date of Training', validators=[DataRequired()])
    cpd = IntegerField('CPD hours',validators=[DataRequired(message='Invalid input')] )
    certificate = FileField('Certificate', validators=[FileRequired(),FileAllowed(['jpg','png','pdf'])])#For certificate

    submit = SubmitField('Submit')

    def validate_duplicate(self, training_course, date):
        training = Training.query.filter_by(training_name=training_course.data,date=date.data).first()
        mv = ManagerVerification.query.filter_by(training_name=training_course.data,date=date.data).first()
        if training or mv:
            raise ValidationError('This is a duplicate training record')

Answer 1

在 Wtforms 文档中，如果你想制作自定义验证器，你需要在 FlaskForm class 中创建一个当前名称为 'validate_ + {your field name}' 的函数，FlaskWtf 将传递整个表单和字段，我认为此代码对您有用

class add_training_form(FlaskForm): #All fields are required
    training_course = SelectField('Training Course', choices=[], validators=[DataRequired()]) #The choices will be assigned in route
    training_provider = SelectField('Training Provider', choices=[], validators=[DataRequired()])
    date = DateField('Date of Training', validators=[DataRequired()])
    cpd = IntegerField('CPD hours',validators=[DataRequired(message='Invalid input')] )
    certificate = FileField('Certificate', validators=[FileRequired(),FileAllowed(['jpg','png','pdf'])])#For certificate

    submit = SubmitField('Submit')

    def validate_training_course(form, training_course):
        training = Training.query.filter_by(training_name=training_course.data,date=form.date.data).first()
        mv = ManagerVerification.query.filter_by(training_name=training_course.data,date=form.date.data).first()
        if training or mv:
            raise ValidationError('This is a duplicate training record')

Flask WTForms 自定义验证器不工作

Flask WTForms Custom Validator Not Working

flask

wtforms

flask-sqlalchemy

flask-wtforms