为什么 StringField 总是 None？

Question

我正在尝试使用 Flask、WTForms 和通过 flask-Bootstrap 提供的宏来读取表单。这在某些情况下有效，而在其他情况下（看似相似的情况下）则无效。当我检查特定 StringField 的内容时，它总是评估为 None，未通过 InputRequired() 验证。

forms.py:

from wtforms import Form, validators, \
                    StringField, PasswordField, SubmitField, \
                    SelectField, RadioField
from wtforms.fields.html5 import DateField
from wtforms.validators import ValidationError, InputRequired, NoneOf, \
                               EqualTo, Length, Optional

class TestForm(Form):
    name = StringField('Name', [validators.InputRequired(message='Please enter name!')])
    date = DateField('Date', format='%Y-%m-%d') #, default=date.today())
    address = StringField('Address')
    submit = SubmitField('Add')

test.py:

from flask import render_template, redirect, request
from flask_security import login_required
from application.routes import routes
from application.forms import TestForm

@routes.route('/test', methods=['POST', 'GET'])
@login_required
def test():
    form = TestForm()
    print(form.name.data)
    if request.method == 'POST' and form.validate():
        print("validated")
        return redirect("/")
    return render_template('test.html', title="Asset Manager", form=form)

test.html:

{% extends 'layout.html' %}

{% import "bootstrap/wtf.html" as wtf %}
{% block content %}
  <div class="container-fluid">
    <h3><u>Test:</u></h3>
    <br>
    <div class="container-fluid col-md-3">
      <form action="" method="POST" class="form" role="form" onsubmit="/">
        <div class="row">
          <div class="col-md-12">
            {{ wtf.form_field(form.name, form_type="inline", placeholder="Name") }}
          </div>
        </div>
        <div class="row">
          <div class="col-md-5">
            {{ wtf.form_field(form.date) }}
          </div>
        </div>
        <div class="row">
          <div class="col-md-12">
            {{ wtf.form_field(form.address) }}
          </div>
        </div>
        {{ wtf.form_field(form.submit, class="btn btn-primary") }}
      </form>
      {% for message in get_flashed_messages() %}
      <div class="alert alert-warning">
        <button type="button" class="close" data-dismiss="alert">&times;</button>
        {{ message }}
      </div>
    </div>
    {% endfor %}
  </div>
{% endblock %}

这总是输出 None 因此即使我输入名称并按 Add[=32 也永远不会通过验证检查=] 按钮。我尝试创建一个最小的示例（它仍然表现出同样的问题），但我遗漏了应用程序的大部分内容，所以如果您需要更多信息 - 请告诉我，我很乐意提供它们。

Answer 1

感谢 Marc，我找到了我遗漏的地方。在实例化表单时，我需要将请求作为参数传递。所以行

form = TestForm()

需要改为

form = TestForm(request.form)

使应用程序正常工作。

为什么 StringField 总是 None？

Why is the StringField always None?

python

flask

wtforms

flask-bootstrap