未定義のエラー：フラスコ重量を使用している場合、 'wtfは未定義です'

Question

私はFlaskとWTFを初めて使用しており、ログインページの設定に問題があります。私は同様のエラーにつながるStackOverflowに関するいくつかの質問を見つけましたが、それらはテンプレートに渡されないフォームに起因しています。 login.htmlとその後、ここ

from flask import Flask 
from flask_bootstrap import Bootstrap 
from flask_sqlalchemy import SQLAlchemy 
from flask import render_template, request, redirect, url_for, send_file 
from flask_wtf import FlaskForm 
from wtforms import StringField, PasswordField, BooleanField 
from wtforms.validators import InputRequired, Email, Length 

from models import * 

app = Flask(__name__) 

app.config['SECRET_KEY'] = 'thisisasecret' 
Bootstrap(app) 

app.config.from_pyfile('config.py') 
db = SQLAlchemy(app) 


class LoginForm(FlaskForm): 
    username = StringField('username', validators=[InputRequired(), Length(min=4, max=15)]) 
    password = PasswordField('password', validators=[InputRequired(), Length(min=8, max=80)]) 
    remember = BooleanField('remember me') 


@app.route('/') 
def index(): 
    return render_template("index.html") 


@app.route('/login') 
def login(): 
    form = LoginForm() 
    return render_template("login.html", form=form) 

とされています：私はエラーを取得しておく

{% extends "layouts/layout1.html" %} 
(% import "bootstrap/wtf.html" as wtf %} 

{% block title %} 
Login 
{% endblock %} 

{% block styles %} 
{{super()}} 
<link rel="stylesheet" href="{{url_for('.static', filename='signin.css')}}"> 
{% endblock %} 

{% block content %} 
    <div class="container"> 

     <form class="form-signin"> 
     <h2 class="form-signin-heading">Please sign in</h2> 
      {{ form.hidden_tag() }} 
      {{ wtf.form_field(form.username) }} 
      {{ wtf.form_field(form.password) }} 
      {{ wtf.form_field(form.remember) }} 
     <button class="btn btn-lg btn-primary btn-block" type="submit">Sign in</button> 
     </form> 

    </div> <!-- /container --> 
{% endblock %} 

"UndefinedErrorを： 'WTF' 未定義である" ここで

はinput.pyときIログインページへのアクセスを試みます。ここではトレースバックは、次のとおりです。

Traceback (most recent call last): 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 2000, in __call__ 
    return self.wsgi_app(environ, start_response) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1991, in wsgi_app 
    response = self.make_response(self.handle_exception(e)) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1567, in handle_exception 
    reraise(exc_type, exc_value, tb) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise 
    raise value 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1988, in wsgi_app 
    response = self.full_dispatch_request() 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1641, in full_dispatch_request 
    rv = self.handle_user_exception(e) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1544, in handle_user_exception 
    reraise(exc_type, exc_value, tb) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise 
    raise value 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1639, in full_dispatch_request 
    rv = self.dispatch_request() 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\app.py", line 1625, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "C:\Users\Bob\Desktop\input-master\input\input.py", line 39, in login 
    return render_template("login.html", form=form) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\templating.py", line 134, in render_template 
    context, ctx.app) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\flask\templating.py", line 116, in _render 
    rv = template.render(context) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\jinja2\environment.py", line 989, in render 
    return self.environment.handle_exception(exc_info, True) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\jinja2\environment.py", line 754, in handle_exception 
    reraise(exc_type, exc_value, tb) 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\jinja2\_compat.py", line 37, in reraise 
    raise value.with_traceback(tb) 
    File "C:\Users\Bob\Desktop\input-master\input\templates\login.html", line 1, in top-level template code 
    {% extends "layouts/layout1.html" %} 
    File "C:\Users\Bob\Desktop\input-master\input\templates\layouts\layout1.html", line 82, in top-level template code 
    {% block content %} 
    File "C:\Users\Bob\Desktop\input-master\input\templates\login.html", line 19, in block "content" 
    {{ wtf.form_field(form.username) }} 
    File "C:\Users\Bob\Anaconda3\lib\site-packages\jinja2\environment.py", line 408, in getattr 
    return getattr(obj, attribute) 
jinja2.exceptions.UndefinedError: 'wtf' is undefined 

Answer 1

(% import "bootstrap/wtf.html" as wtf %}

あなたのimport文の開始時にサークルブレースを持っているように見えます！