from flask_admin import Admin,AdminIndexView from run import app from flask_admin.contrib.sqla import ModelView from flask import current_app,redirect,url_for,request from models import db,User,BanJi,KeCheng,TongGao,ChengJi class MyModelView(ModelView): def inaccessible_callback(self, name, **kwargs): # redirect to login page if user doesn't have access return redirect(url_for('login', next=request.url)) class MyUser(MyModelView): column_labels = dict( name='账号', email='邮箱', pwd='密码', ) column_searchable_list = ['name','家庭情况'] class MyBanJi(MyModelView): column_labels = dict( name='班级名', banzhuren='班主任', ) column_searchable_list = ['name'] class MyKeCheng(MyModelView): column_labels = dict( name= '课程名', beizhu = '课程每周安排时间' ) column_searchable_list = ['name'] admin = Admin(app=app, name='后台管理系统',template_mode='bootstrap3', base_template='admin/mybase.html',index_view=AdminIndexView( name='导航栏', template='admin/welcome.html', url='/admin' )) admin.add_view(MyBanJi(BanJi, db.session,name='班级信息管理')) admin.add_view(MyUser(User, db.session,name='用户信息管理')) admin.add_view(MyKeCheng(KeCheng, db.session,name='课程信息管理')) admin.add_view(MyModelView(ChengJi, db.session,name='成绩信息管理')) admin.add_view(MyModelView(TongGao, db.session,name='公告管理')) if __name__ == '__main__': app.run(debug=True)注释这段代码

这段代码使用 Flask-Admin 库创建了一个后台管理系统，包含了对班级、用户、课程、成绩和公告的管理。 MyModelView 继承了 Flask-Admin 提供的 ModelView，自定义了一个 inaccessible_callback 方法，用于处理未授权用户访问页面的情况。 MyUser、MyBanJi 和 MyKeCheng 分别继承了 MyModelView，用于定制不同模型的视图。最后，创建了一个 Admin 实例，并通过 add_view 方法将不同模型的视图添加到后台管理系统中。如果该脚本直接运行，则启动 Flask 服务器开启调试模式。

相关问题

from flask.globals import app_ctx

As an AI language model, I don't have access to the specific Flask application that you're working on. However, I can explain what the `app_ctx` object is in Flask.

The `app_ctx` object is a context object that is used to store application-level information in Flask. It is a global object that is created when the Flask application is initialized and it is destroyed when the application is shut down. The `app_ctx` object is used to store information that is shared across multiple requests, such as database connections, configuration settings, and other resources that are needed by the application.

To access the `app_ctx` object in Flask, you can use the `current_app.app_context()` method. This method returns a context object that provides access to the `app_ctx` object. Once you have the `app_ctx` object, you can access any application-level information that has been stored in it.

For example, to access a database connection that has been stored in the `app_ctx` object, you could use code like this:

from flask import current_app

with current_app.app_context():
    db_conn = current_app.config['DB_CONN']
    # Use the database connection here

In this code, the `current_app.config['DB_CONN']` line retrieves the database connection from the `app_ctx` object, which has been stored there as part of the application's configuration settings. The `with current_app.app_context():` line ensures that the `app_ctx` object is available for use within the code block.

from flask._compat import text_type ModuleNotFoundError: No module named 'flask._compat'

这个错误是由于找不到名为'flask._compat'的模块导致的。'flask._compat'是Flask框架中的一个模块，用于处理Python版本之间的兼容性问题。可能是因为你没有安装Flask或者版本不匹配导致找到该模块。

解这个问题的方法是确保你已正确安装了Flask，并且版本与你的代码要求的版本一致。你可以使用以下命令来安Flask：

pip install flask

如果你已经安装了Flask，但仍然出现这个错误，可能是因为你的代码中有其他问题导致无法导入'flask._compat'模块。你可以检查一下你的代码是否正确引入了Flask，并且没有拼写错误或其他语法错误。