Laravel从4.2迁移到5.1错误

I'm having a tough time migrating the Laravel 4.2 files to Laravel 5.1. I know it works with a lot of namespacing. So probably most of my errors would be because of the namespace issues. But I'm a bit new to namespace things. So I've some problems. I hope this would also benefit to some other users as well.

Composer.json file :

   "classmap": [
        "database",
        "app/Http/Controllers",
        "app/Models"
    ],
  1. According to the Laravel 5.1 updgrade documentation, I've creates a App\Models structure for the Models.

I'm getting this error related to Models. Where Backers.php and User are the models. What namespace should I provide to avoid this?

FatalErrorException in Backers.php line 16: Class 'User' not found

  1. I've used User::find($id) in some Views and Controllers. Instead of always calling \App\User::find($id), is there any other way I could approach this problem?

  2. displayLesson is a route name and sometimes I'm getting an error like

App\Http\Controllers\displayLesson not found.

How can I approach these problems?

I don't understand ur exact problem but u can write "use .. as ..." at the top of the class after namespace the class name you use alot to avoid writing App\User

namespace App\http\superImportantController Use App\User as User;

Or not a very good practice but time consuming is to add your model into facades in app.php

However , I guess the best practice is to use proper namespacing to be compliant with psr-7