如何将Flask Login与蓝图一起使用 [英] How to use Flask Login with Blueprints

问题描述

我正在尝试对我的烧瓶应用程序使用LoginManager.当我运行该应用程序并打开索引页面时，它显示以下内容

wsgi_app中的

  File``... \ python38-32 \ lib \ site-packages \ flask \ app.py''行2447响应= self.full_dispatch_request()在full_dispatch_request中，文件1955行的文件``... \ python38-32 \ lib \ site-packages \ flask \ app.py''rv = self.handle_user_exception(e)在handle_user_exception中的第1821行中的文件"... \ python38-32 \ lib \ site-packages \ flask \ app.py"加价(exc_type，exc_value，tb)重新列出文件"... \ python38-32 \ lib \ site-packages \ flask \ _compat.py"，第39行提高价值在full_dispatch_request中，在第1950行中的文件``... \ python38-32 \ lib \ site-packages \ flask \ app.py''rv = self.dispatch_request()在dispatch_request中，文件"... \ python38-32 \ lib \ site-packages \ flask \ app.py"，第1936行返回self.view_functions [rule.endpoint](** req.view_args)文件"... \ root \ project \ user_auth \ routes.py"，第18行，在索引中返回render_template('index.html'，title ='Welcome')在render_template中，文件"... \ python38-32 \ lib \ site-packages \ flask \ templating.py"，第137行返回_render(_render中的文件"... \ python38-32 \ lib \ site-packages \ flask \ templating.py"，第120行rv = template.render(上下文)渲染中的文件"... \ python38-32 \ lib \ site-packages \ jinja2 \ environment.py"，行1090self.environment.handle_exception()在handle_exception中的文件"... \ python38-32 \ lib \ site-packages \ jinja2 \ environment.py"，第832行重新提高(* rewrite_traceback_stack(source = source))重新列出文件"... \ python38-32 \ lib \ site-packages \ jinja2 \ _compat.py"，第28行提高价值.with_traceback(tb)顶级模板代码中的文件"... \ root \ project \ user_auth \ templates \ index.html"，第1行{％扩展了"base.html"％}顶级模板代码中的文件"... \ root \ project \ user_auth \ templates \ base.html"，第13行{％，如果current_user.is_anonymous％}getattr中的文件``... \ python38-32 \ lib \ site-packages \ jinja2 \ environment.py''，第471行返回getattr(obj，attribute)jinja2.exceptions.UndefinedError:'current_user'未定义 

这是我的结构

  root/config.py|项目/|__init__.py|user_auth/|__init__.py|app.py|route.py 

在app/ init .py文件中，该文件如下

从烧瓶导入烧瓶的

 从配置导入配置app = Flask(__ name__)app.config.from_object(Config)从.user_auth.routes导入user_auth_bpapp.register_blueprint(user_auth_bp，url_prefix =".) 

来自user_auth init ..py文件为

从烧瓶导入烧瓶的

 从配置导入配置从flask_sqlalchemy导入SQLAlchemy从flask_migrate导入迁移从flask_login导入LoginManager从烧瓶导入current_appapp = Flask(__ name__)app.config.from_object(Config)db = SQLAlchemy(应用程序)迁移=迁移(app，db)login = LoginManager(app)login.login_view ='.login'app.config ['SECRET_KEY'] ='试用版'从..user_auth导入路线，模型 

这是user_auth/routes.py文件

来自..user_auth导入应用程序，数据库的

 从flask_login导入login_required从..user_auth.forms导入RegistrationForm，LoginForm从flask导入请求，render_template，flash，重定向，url_for，蓝图从werkzeug.urls导入url_parse从flask_login导入logout_user从flask_login导入current_user，login_user从..user_auth.models导入用户从烧瓶进口蓝图user_auth_bp =蓝图('user_auth'，__name__，template_folder ='templates')@ user_auth_bp.route('/')@ user_auth_bp.route('/index')def index():返回render_template('index.html'，title ='Welcome')@ user_auth_bp.route('/register'，methods = ["POST"，"GET"])def register():表格= RegistrationForm()如果form.validate_on_submit():打印(已验证")#创建用户模型用户名= form.username.data密码= form.password.data电子邮件= form.email.datanewUser =用户(用户名=用户名，电子邮件=电子邮件)newUser.set_password(密码)db.session.add(newUser)db.session.commit()返回重定向(url_for('.index'))别的:返回render_template('register.html'，title ='Welcome'，form = form)...(其他路径) 

我正在运行Windows，并使用了以下命令

  set FLASK_APP = project 

然后我使用

 烧瓶运行 

预先感谢您的帮助.

解决方案

您可以尝试搜索相同的问题

I'm trying to use LoginManager for my flask application. When I run the application and open the index page, it says the following

File "...\python38-32\lib\site-packages\flask\app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "...\python38-32\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "...\python38-32\lib\site-packages\flask\app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "...\python38-32\lib\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "...\python38-32\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "...\python38-32\lib\site-packages\flask\app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "...\root\project\user_auth\routes.py", line 18, in index
    return render_template('index.html', title='Welcome')
  File "...\python38-32\lib\site-packages\flask\templating.py", line 137, in render_template
    return _render(
  File "...\python38-32\lib\site-packages\flask\templating.py", line 120, in _render
    rv = template.render(context)
  File "...\python38-32\lib\site-packages\jinja2\environment.py", line 1090, in render
    self.environment.handle_exception()
  File "...\python38-32\lib\site-packages\jinja2\environment.py", line 832, in handle_exception
    reraise(*rewrite_traceback_stack(source=source))
  File "...\python38-32\lib\site-packages\jinja2\_compat.py", line 28, in reraise
    raise value.with_traceback(tb)
  File "...\root\project\user_auth\templates\index.html", line 1, in top-level template code
    {% extends "base.html" %}
  File "...\root\project\user_auth\templates\base.html", line 13, in top-level template code
    {% if current_user.is_anonymous %}
  File "...\python38-32\lib\site-packages\jinja2\environment.py", line 471, in getattr
    return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'current_user' is undefined

Here is my structure

root /
config.py
   |project/
        | __init__.py
        | user_auth/

              | __init__.py
              | app.py
              | routes.py

In the app/init.py file, it is the following

from flask import Flask
from config import Config

app = Flask(__name__)
app.config.from_object(Config)

from .user_auth.routes import user_auth_bp
app.register_blueprint(user_auth_bp, url_prefix="")

From the user_auth init.py file is

from flask import Flask
from config import Config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from flask import current_app

app = Flask(__name__)
app.config.from_object(Config)
db = SQLAlchemy(app)
migrate = Migrate(app, db)
login = LoginManager(app)
login.login_view = '.login'

app.config['SECRET_KEY'] = 'trial'

from ..user_auth import routes, models

This is the user_auth/routes.py file

from ..user_auth import app, db
from flask_login import login_required
from ..user_auth.forms import RegistrationForm, LoginForm
from flask import request, render_template, flash, redirect, url_for, Blueprint
from werkzeug.urls import url_parse
from flask_login import logout_user

from flask_login import current_user, login_user
from ..user_auth.models import User


from flask import Blueprint
user_auth_bp = Blueprint('user_auth', __name__, template_folder='templates')

@user_auth_bp.route('/')
@user_auth_bp.route('/index')
def index():
    return render_template('index.html', title='Welcome')


@user_auth_bp.route('/register', methods=["POST", "GET"])
def register():

    form = RegistrationForm()

    if form.validate_on_submit():
        print("validated")

        # Create User Model
        username = form.username.data
        password = form.password.data
        email = form.email.data

        newUser = User(username=username,email=email)
        newUser.set_password(password)

        db.session.add(newUser)
        db.session.commit()
        
        return redirect(url_for('.index'))
    else: 

        return render_template('register.html', title='Welcome', form=form)

... (Other paths)

I am running Windows and used the following command

set FLASK_APP=project

I then use

flask run

Thank you in advance for the help.

解决方案

You can try to search same problem UndefinedError: 'current_user' is undefined

Check the init file:

login_manager = LoginManager()
    login_manager.login_view = 'auth.login'
    login_manager.init_app(app)
    from .models import User
    @login_manager.user_loader
    def load_user(user_id):
        user = User.query.filter_by(id=user_id).first()

And strure, i think you should do like that

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