我的自定义烧瓶 ValidationError 不工作

Question

form.py

class RegistrationForm(FlaskForm):
      username=StringField('Username',validators=[DataRequired(),Length(min=2,max=20)])
      email=StringField('Email',validators=[DataRequired(),Length(min=2,max=20),Email()])
      password=PasswordField('Password',validators=[DataRequired(),Length(min=8,max=20)])
      confirm_password=PasswordField('Confirm Password',validators= 
           [DataRequired(),Length(min=8,max=20),EqualTo('password')])
      submit=SubmitField('SignUp')

      def valiate_username(self,username):
          user=User.query.filter_by(username=username).first()
          if user:
              raise ValidationError('Username Exists')

      def valiate_email(self,email):
          user=User.query.filter_by(email=email).first()
          if user:
              raise ValidationError('Email exists, please Login or Click forgot password If you forgot')

routes.py

@app.route("/register", methods=['GET','POST'])
def register():
    form=RegistrationForm()
    if form.validate_on_submit():
        hpasskey=bcrypt.generate_password_hash(form.password.data).decode('utf-8')
        user=User(username=form.username.data,email=form.email.data,password=hpasskey)
        db.session.add(user)
        db.session.commit()
        flash(f'Account Created for {form.username.data}!','success')
        return redirect(url_for('login'))
    return render_template('register.html', title='Register', form=form)

Returns

sqlalchemy.exc.IntegrityError

sqlalchemy.exc.IntegrityError：（sqlite3.IntegrityError）唯一约束失败：user.username [SQL：插入用户（用户名、电子邮件、image_file、密码）值（？、？、？、？）] [参数: ('Kelvinasdhe', 'achiampon@gmail.com', 'default.jpg', '$2b$12$NusydBknOBkgkq60FJIyO.fsgIPnlk3HhB5n9kLAdczt4jvUtViiy')] （此错误的背景信息位于：http://sqlalche.me/e/gkpj）

Answer 1

有一个拼写错误：valiate_username 应该是 validate_username（与电子邮件相同）

而在validate_username中username是一个字段。要获得估算值，您必须使用 username.data :

user=User.query.filter_by(username=username.data).first()

我的自定义烧瓶 ValidationError 不工作

My Custom flask ValidationError not working

python

sqlite

sqlalchemy

flask

wtforms

form.py

routes.py

Returns