Question

在尝试加载register.html页面时，我的烧瓶应用程序无法识别表单变量时遇到问题。我试图重新加载我的virtualenv并试图从另一个人加载模板代码，但我得到了相同的错误。这是我得到的追溯。

File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "s:\projects\gameapp\env\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "s:\projects\gameapp\env\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "s:\projects\gameapp\env\lib\site-packages\flask\app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "S:\Projects\gameapp\gameapp.py", line 35, in register
return render_template('register.html', title='Register', form='form')
File "s:\projects\gameapp\env\lib\site-packages\flask\templating.py", line 135, in render_template
context, ctx.app)
File "s:\projects\gameapp\env\lib\site-packages\flask\templating.py", line 117, in _render
rv = template.render(context)
File "s:\projects\gameapp\env\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
return original_render(self, *args, **kwargs)
File "s:\projects\gameapp\env\lib\site-packages\jinja2\environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "s:\projects\gameapp\env\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "s:\projects\gameapp\env\lib\site-packages\jinja2\_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "S:\Projects\gameapp\templates\register.html", line 1, in top-level template code
{% extends "layout.html" %}
File "S:\Projects\gameapp\templates\layout.html", line 44, in top-level template code
{% block content %}{% endblock %}
File "S:\Projects\gameapp\templates\register.html", line 9, in block "content"
{{ username.label(class="form-control-label") }}
File "s:\projects\gameapp\env\lib\site-packages\jinja2\environment.py", line 430, in getattr
return getattr(obj, attribute)

这是我的registration.html页面

{% extends "layout.html" %}
{% block content %}
    <div class="content-section">
        <form method="POST" action="">
            {{ form.hidden_tag }}
            <fieldset class="form-group">
                <legend class="border-bottom mb-4">Join Today</legend>
                <div class="form-group">
                    {{ form.username.label(class="form-control-label") }}
                    {{ form.username(class="form-control form-control-lg") }}
                </div>
                <div class="form-group">
                    {{ form.email.label(class="form-control-label")}}
                    {{ form.email(class="form-control form-control-lg")}}
                </div>
                <div class="form-group">
                    {{ form.password.label(class="form-control-label") }}
                    {{ form.password(class="form-control form-control-lg") }}
                </div>
                <div class="form-group">
                    {{ form.confirm_password.label(class="form-control-label") }}
                    {{ form.confirm_password(class="form-control form-control-lg") }}
                </div>
            </fieldset>
            <div class="form-group">
                {{ form.submit(class="btn btn-outline-info") }}
            </div>
        </form>
    </div>
    <div class="border-top pt-3">
        <small class="text-muted">
            Already Have An Account? <a class="ml-2" href="{{ url_for('login') }}">Sign In</a>
        </small>
    </div>
{% endblock content %}

我试图删除引发错误的代码，而我仅在下一行收到一个错误，说没有属性“ email”，我认为这与版本错误有关，因为一切正常除此之外（当前）。任何帮助将不胜感激。

Answer 1

您需要使用“ class_”属性进行标记，而不是“ class”，这意味着您需要修复

heroku ps
heroku ps:stop run.5838 --app afternoon-bayou-10667

到

{{ form.username.label(class="form-control-label") }}

在整个模板中

等等。

Answer 2

如用户@ Andellys所述，您应该从class更改为class_，但是，也许您还没有实例化表单。请检查以下答案：hidden_tag() missing 1 required positional argument: 'self' in flask forms?。

Answer 3

在解决错误之前，您需要先了解它。

在这里，错误明确指出str object没有属性username。这意味着使用名为username的属性的对象是str类型的（而它应该是表单类的对象）。

如果您还发布了表单的python代码，那会很容易，但是我仍然尝试找出问题所在。

假设您的表单类的名称为 Form ，即其声明如下：

class Form(FlaskForm):

然后在呈现registration.html的python文件中，您必须做类似的事情

form = Form()

我最好的猜测是，您已经将班级名称用引号引起来

forms = 'Forms()'

并且由于这个python将其解释为str对象而不是Form对象

因此只需删除实例化语句中的引号，您就可以开始使用

。

希望有帮助：）

jinja2.exceptions.UndefinedError：'str对象'没有属性'用户名'

3 个答案: