Laravel after composer update model method call undefined - php

Question

I am working on a project with Laravel 4.2 and I created some models and controllers and called model function from controller, the problem is after composer update command it displays this error: Call to undefined method Department::getAllParent() but before composer update it works fine. You think what is the problem with this issue? thanks in advance
Model code:
class Department extends Eloquent{
/**
* The database table used by the model.
*
* #var string
*/
protected $table = 'department';
public static function getAll()
{
$table = DB::table('department');
$object = $table->get();
return $object;
}
public static function getAllParent()
{
$table = DB::table('department');
$table->where('parent',0);
$object = $table->get();
return $object;
}
}
And Controller code:
class DepartmentController extends BaseController
{
/*
Getting all records from department
#param: none
#Accessiblity: public
#return: Object
*/
public function getAllDepartment()
{
//get data from model
$deps = Department::getAllParent();
$depAll = Department::getAll();
//load view for users list
return View::make("department.dep_list")->with('deps',$deps)->with('all',$depAll);
}
}

Answer 1

Don't think this is related to your issues but this might be a better way to handle these queries. you are using Eloquent and setting the table parameter. why not use Eloquent's build in power?
class Department extends Eloquent{
/**
* The database table used by the model.
*
* #var string
*/
protected $table = 'department';
public static function getAll()
{
return Department::get();
}
public static function getAllParent()
{
return Department::where('parent', 0)->get();
}
}
I think you might also be able to use $this->get(); but I can't test right now.