FlaskForm检查错误并刷新错误消息_问答-阿里云开发者社区

我的表单设置如下，最终，在调试模式下出现的错误是sqlalchemy.exc.IntegrityError：（sqlite3.IntegrityError）UNIQUE约束失败。我知道为什么，但是我希望将此错误提示给用户，以便他们知道问题所在。

class RegistrationForm(FlaskForm):
    company_url = StringField('Company Website', validators=[DataRequired(), URL(message='Must be a valid URL')])
    password = PasswordField(
        'Password', validators=[DataRequired(), EqualTo('pass_confirm',
                                                        message='Passwords must match')]
    )
    pass_confirm = PasswordField('Confirm Password', validators=[DataRequired()])
    submit = SubmitField('Register!')

但是，当不正确的URL结构输入到表单中并提交后，我无法使它在用户的html页面中刷新错误消息。html页面如下。我也将base.html放在下面。

{% extends "base.html" %}
{% block content %}
    <form method="POST">
        {{form.hidden_tag()}}
        {{form.company_url.label}}{{form.company_url()}}<br>
        {{form.password.label}}{{form.password()}}<br>
        {{form.pass_confirm.label}}{{form.pass_confirm()}}<br>
        {{form.submit()}}
    </form>
{% endblock %}



<!DOCTYPE html>
<html>
  <head>
   ...some code here
  </head>
  <body>
    <!-- Just an image -->
<nav class="navbar navbar-dark bg-dark">
  <span class="align-bottom text-light">Creating connections, saving time</span>
</nav>

    {% with messages = get_flashed_messages() %} {% if messages %} {% for
    message in messages %}
    <div class="alert alert-warning alert-dismissible" role="alert">
      <button
        type="button"
        class="close"
        data-dismiss="alert"
        aria-label="Close"
      >
        <span aria-hidden="true">×</span>
      </button>
      {{message}}
    </div>
    {% endfor %} {% endif %} {% endwith %} {% block content %} {% endblock %}
  </body>
</html>

views.py是：

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

    form = RegistrationForm()

    if form.validate_on_submit():
        user = Buyers(
            company_url=form.company_url.data,
            password=form.password.data
        )

        db.session.add(user)
        db.session.commit()
        flash("Thank you for registering.")
        return redirect(url_for('login'))

    return render_template('register.html', form=form)

如何处理表格错误，以确保用户知道他们输入的URL结构不正确？我处于调试模式，现在，register.html页面基本上只是重新加载，没有任何关于原因的消息。谢谢！

问题来源：stackoverflow

import validators @app.route('/register', methods=['GET', 'POST']) def register(): form = RegistrationForm() if form.validate_on_submit(): isUrlValid=validators.url(form.company_url.data) if isUrlValid==True: user = Buyers( company_url=form.company_url.data, password=form.password.data ) db.session.add(user) db.session.commit() flash("Thank you for registering.") return redirect(url_for('login')) else: flash("URL is not valid. Please enter a valid URL") return redirect(url_for('register')) return render_template('register.html', form=form)

FlaskForm检查错误并刷新错误消息

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