some progress

app/Models/Role.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Role extends Model
+{
+    protected $fillable = [
+        'name',
+        'slug',
+        'description',
+    ];
+
+    public function users()
+    {
+        return $this->belongsToMany(User::class, 'role_user');
+    }
+
+    public function permissions()
+    {
+        return $this->belongsToMany(Permission::class, 'permission_role');
+    }
+
+    public function hasPermission($permission)
+    {
+        if (is_string($permission)) {
+            return $this->permissions->contains('slug', $permission);
+        }
+
+        return $this->permissions->contains('id', $permission->id);
+    }
+
+    public function givePermissionTo($permission)
+    {
+        return $this->permissions()->save($permission);
+    }
+}