Handling Roles

RolesTrait.php

<?php

namespace App\Traits\User;

use App\Models\Role;  
use App\Models\Permission;  
use Illuminate\Database\Eloquent\ModelNotFoundException;

trait Roles {  
    public function roles()
    {
        return $this->hasMany('App\Models\Role');
    }


    //attach a role by name to a user
    public function attach($role_name) 
    {
        try{
            $role = Role::where('name', '=', $role_name)->firstOrFail();

            //if the role already exists on a user, return false
            if($this->isRole($role->name)) {
                return false;
            }

            Permission::create([
                'user_id' => $this->id,
                'role_id' => $role->id,
            ]);

            return true;
        }
        catch(ModelNotFoundException $e) {
            return false;
        }
    }

    //check if a user is a certain role
    public function isRole($role_name) 
    {
        try{
            $role = Role::where('name', '=', $role_name)->firstOrFail();
            Permission::where([
                'user_id' => $this->id,
                'role_id' => $role->id,
            ])->firstOrFail();

            return true;
        }
        catch(ModelNotFoundException $e) {
            return false;
        }
    }
}


// In Controller
/**
 * Determine whether the user can view the post.
 *
 * @param  \App\User  $user
 * @param  \App\Study  $study
 * @return mixed
 */
public function view(User $user, Post $post)
{
    return $user->isRole('admin');
}