Laravel 4：使用$ this和未定义的变量：user_id

Question

I'm new with Laravel and I have some problem

First Problem: When I using $this-> in __construct function , and want to using it in a method Like this code:

// construct method
public function __construct() {
        $this->user_id = Auth::user()->id_user;
}
// another method 
    public function index()
    {


        $this->data['files'] = DB::table('mhd_cloud_transfer_files')->distinct()
                    ->where('mhd_cloud_transfer_files.to_transfer_file',$this->user_id )
                    ->where('mhd_cloud_transfer_files.folder_transfer_file',0)
                    ->orwhere(function($query){
                        $query->where('from_transfer_file', $this->user_id );
                        $query->where('to_transfer_file',0);
                    })
                    ->join('mhd_cloud_files', 'mhd_cloud_files.id_file', '=','mhd_cloud_transfer_files.id_file')
                    ->join('mhd_main_users', 'mhd_main_users.id_user', '=', 'mhd_cloud_files.author_file')
                    ->paginate(25);
 }

this error :

ErrorException: Undefined variable: user_id

and another problem when I'm using $this-> in methods

in same problem this error:

Using $this when not in object context

This is All of my code (controller class) http://pastebin.com/eVbuknLd

Answer 1

try adding public var $user_id to the class declaration.

just remember to check Auth::user() for a NULL that indicates no user is logged in. unless you are sure you check it anywhere you use this class.