表单验证消息未显示 - Flask

Question

我无法在Flask中获取错误消息进行渲染。 我怀疑这与蓝图有关。以前，在views.py中看到的逻辑在用户蓝图中，但我已将其移植到主蓝图上。无论如何，从那时起，我无法获得要呈现的错误消息。

我认为我遇到问题的具体方法是：

self.email.errors.append（“此电子邮件已注册”）

的项目/主/ views.py

@main_blueprint.route('/', methods=['GET', 'POST'])
@main_blueprint.route('/<referrer>', methods=['GET', 'POST'])
def home(referrer=None):

    form = RegisterForm(request.form)

    # prepares response
    resp = make_response(render_template('main/index.html', form=form))
    if form.validate_on_submit():
       do_stuff()
    return resp

的项目/主/ index.html中

<h1>Please Register</h1>
<br>
<form class="" role="form" method="post" action="">
  {{ form.csrf_token }}
  {{ form.email(placeholder="email") }}
    <span class="error">
      {% if form.email.errors %}
        {% for error in form.email.errors %}
          {{ error }}
        {% endfor %}
      {% endif %}
    </span>
  </p>
  <button class="btn btn-success" type="submit">Register!</button>
  <br><br>
  <p>Already have an account? <a href="/login">Sign in</a>.</p>
</form>

项目/用户/ forms.py

class RegisterForm(Form):
        email = TextField(
            'email',
            validators=[DataRequired(), Email(message=None), Length(min=6, max=40)])

def validate(self):
    print "validating"
    initial_validation = super(RegisterForm, self).validate()
    if not initial_validation:
        print "not initial validation"
        return False
    user = User.query.filter_by(email=self.email.data).first()
    print user
    if user:
        print self
        print "error, email already registered"
        self.email.errors.append("This Email is already registered")
        return False
    return True

尝试调试时，“print user”的值为：

project.user.forms.RegisterForm对象位于0x7fa436807698

Answer 1

让它工作，@ glls，你是对的。把代码写成：

@main_blueprint.route('/', methods=['GET', 'POST'])
@main_blueprint.route('/<referrer>', methods=['GET', 'POST'])
def home(referrer=None):

    # prepares response
    resp = make_response(render_template('main/index.html', form=form))
    if form.validate_on_submit():
       do_stuff()

    form = RegisterForm(request.form)

    return resp