Flask-WTF表单在GET请求期间有错误 [英] Flask-WTF form has errors during GET request

问题描述

我有Flask-WTF表单的Flask视图。当我在浏览器中加载页面时，即使我还没有提交，表单总是有错误。为什么表单在提交前有错误？

  @ app.route（'/'，methods = ['GET' ，'POST']）
 def index（）：
 form = ApplicationForm（request.form）
 $ b $ if form.is_smit（）：
 print提交
 
如果form.validate（）：
打印有效
 
打印（form.errors）
 
如果是form。 validate_on_submit（）：
返回重定向（'index'）
 
返回render_template（'index.html'，form = form）
  

  127.0.0.1  -   -  [30 / Nov / 2016 16:54:12]GET / HTTP / 1.1200  -  
 {'department'：[u'不是一个有效的选择']，'email'：[u'This field is required。']，'csrf_token'：['CSRF token missing ']，'name'：[u'This field is required。']，'address'：[u'This field is required。']} 
  

解决方案

这是一个ge t请求，所以 request.form 是空的。您无条件地调用 validate ，所以您正在验证空数据。所以一切都是无效的这就是为什么 validate_on_submit 存在：它不验证获取请求，因为它们没有表单数据。

删除 if form.validate（） block。

$ b

form.errors 仅在验证后填充，因此将其移动到 validate_on_submit 块之下，否则它将始终显示为空。

---

另外，你不需要传递 request.form ，Flask-WTF会自动传递它表单被提交。

I have a Flask view with a Flask-WTF form. When I load the page in the browser, the form always has errors, even though I haven't submitted it yet. Why does the form have errors before it is submitted?

@app.route('/', methods=['GET', 'POST'])
def index():
    form = ApplicationForm(request.form)

    if form.is_submitted():
        print "Form successfully submitted"

    if form.validate():
        print "valid"

    print(form.errors)  

    if form.validate_on_submit():
        return redirect('index')

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

127.0.0.1 - - [30/Nov/2016 16:54:12] "GET / HTTP/1.1" 200 -
{'department': [u'Not a valid choice'], 'email': [u'This field is required.'], 'csrf_token': ['CSRF token missing'], 'name': [u'This field is required.'], 'address': [u'This field is required.']}

解决方案

This is a get request, so request.form is empty. You're calling validate unconditionally, so you're validating against empty data. Therefore, everything's invalid. This is why validate_on_submit exists: it doesn't validate for get requests, since they don't have form data.

Remove the if form.validate() block.

form.errors is only populated after validation, so move it below the validate_on_submit block or it will always appear empty.

---

Also, you don't need to pass request.form, Flask-WTF will automatically pass it if the form is submitted.

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