Flask返回TypeError:视图函数未返回有效响应
Flask返回TypeError:视图函数未返回有效响应
提问于 2019-07-10 04:36:32
我是Flask的新手，正在尝试使用flask建立简单的用户表单页面，并遇到错误。当我试图渲染纯超文本标记语言，扩展base.html，一切都很好，但是当添加宏时，结果如下。我试了所有的方法，但我不能自己解决这个问题。任何提示，我做错了什么？
[2019-07-09 22:19:39,837] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
File "path/venv/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
response = self.full_dispatch_request()
File "path/venv/lib/python3.6/site-packages/flask/app.py", line 1952, in full_dispatch_request
return self.finalize_request(rv)
File "path/venv/lib/python3.6/site-packages/flask/app.py", line 1967, in finalize_request
response = self.make_response(rv)
File "path/venv/lib/python3.6/site-packages/flask/app.py", line 2130, in make_response
" {rv.__class__.__name__}.".format(rv=rv)
TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a UserForm.
127.0.0.1 - - [09/Jul/2019 22:19:39] "GET / HTTP/1.1" 500 -这是我的Python代码：
from app import app
from flask import render_template
from flask_wtf import FlaskForm
from wtforms import StringField, TextAreaField, SelectField
from wtforms.validators import InputRequired
@app.route('/', methods=['GET', 'POST'])
class UserForm(FlaskForm):
prefix = StringField("Prefix", validators=[InputRequired()])
anrede = StringField("Anrede", validators=[InputRequired()])
def form():
form = UserForm()
return render_template('html_one_flask.html', form=form)我正在尝试加载的表单
{% extends "base.html" %}
{% from "render_field.html" import render_field %}
{% block content %}
<div class = "container">
<div class = "spacer" > </div>
</div>
<div class = "container" id = "data_category">PERSONAL DATEN</div>
<div class = "container">
<div class = "spacer" > </div>
<div class="form-group row flex-v-center" id = 1>
{{ render_field(form.prefix), placeholder = form.prefix.label.text }}
{{ render_field(form.anrede), placeholder = form.anrede.label.text }}
</div>
</div>
{% endblock %}和从另一个文件导入的宏
{% macro render_field(field) %}
<div class = "col-0.75">
<div class = "spacer_label" > </div>
<label for="{{ field.name }}">{{ field.label.text }} </label>
</div>
<div class = "col-1">
{{ field(class_ = "form-control input-sm", **kwargs|safe }}
</div>
{% endmacro %}回答 2
Stack Overflow用户
回答已采纳
发布于 2019-07-10 08:43:47
您的@app.route应该位于视图函数之上，而不是类声明之上：
@app.route('/', methods=['GET', 'POST'])
def form():
...Stack Overflow用户
发布于 2019-07-10 17:39:48
你把@app.route装饰者放在了王家
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56960188
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