WTF表格未经验证

Question

出于某种原因，我的wtf表单似乎没有验证。使用已存在的用户名完成表单后，我按下提交，页面保持原样，尽管在代码中，但不会引发验证错误。具有新用户名的用户可以很好地添加到数据库中。

希望有人可以将代码复制/粘贴到文本编辑器中并使其运行：

这是表格：

class RegistrationForm(FlaskForm):

    username = StringField('Username', validators = [DataRequired()])
    password = PasswordField('Password', validators = [DataRequired()])
    submit = SubmitField('Register')

    def validate_username(self,field):
        if UserRegistration.query.filter_by(username=field.data).first():
            raise ValidationError('Your username has been registered already!')

这是模型类：

class UserRegistration(db.Model, UserMixin):

__tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.Text, unique=True, index=True)
    password_hash = db.Column(db.Text(128))


    def __init__(self, username, password):
        self.username = username
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

    def __repr__(self):
        return f"Username {self.username}"

这是观点：

@users.route('/register', methods=['GET', 'POST'])
def register():
    form = RegistrationForm()

    if form.validate_on_submit():
        username = form.username.data
        password = form.password.data

        user = UserRegistration(username, password)
        db.session.add(user)
        db.session.commit()

        flash(f'Thanks for registering! Your credentials are: Username: {username}, Password: {password}')

        return redirect(url_for('users.all_users'))
    return render_template('register.html', form=form)

这是表格所在的html文档：

{% extends 'base.html' %}
{% block content %}

<div class="container col-md-8 col-md-offset-2">
  <h1>Registration Form</h1> <br>

    <form method="POST">
      {{form.hidden_tag()}}

      <div class="form-group">
        {{form.username.label()}}
        {{form.username(class='form-control form-text text-muted')}}
      </div>

      <div class="form-group">
        {{form.password.label()}}
        {{form.password(class='form-control form-text text-muted')}}
      </div>

      <div class="form-group">
        {{form.submit(class="btn btn-primary")}}
      </div>

    </form>
</div>
{% endblock %}

Answer 1

WTForm内联验证器方法必须使用以下约定：validate_<field_name>。

在您的示例中，您感兴趣的表单字段，即需要验证的表单字段如下：[username, email]所以您的验证方法必须是：validate_username(...)和validate_email(...)。而不是check_email(...)和check_username(...)，这不是WTForm期望的在线验证器......

尝试重命名验证方法以符合WTForm在线规范，类似于以下内容：

def validate_email(self,field):
    # check is none for that user email!
    if UserRegistration.query.filter_by(email=field.data).first():
        raise ValidationError('Your email has been registered already!')

def validate_username(self,field):
    if UserRegistration.query.filter_by(username=field.data).first():
        raise ValidationError('Your username has been registered already!')

希望这有帮助！