public function getPermissions()
    {
        // user permissions overridden from role.
        $permissions = \Cache::remember(
            'acl.getPermissionsById_'.$this->id,
            config('acl.cacheMinutes'),
            function () {
                return $this->getPermissionsInherited();
            }
        );

        // permissions based on role.
        // more permissive permission wins
        // if user has multiple roles we keep
        // true values.
        foreach ($this->roles as $role) {
            foreach ($role->getPermissions() as $slug => $array) {
                if ( array_key_exists($slug, $permissions) ) {
                    foreach ($array as $clearance => $value) {
                        if( !array_key_exists( $clearance, $permissions[$slug] ) ) {
                            ! $value ?: $permissions[$slug][$clearance] = true;
                        }
                    }
                } else {
                    $permissions = array_merge($permissions, [$slug => $array]);
                }
            }
        }

        return $permissions;
    }