Usermanager/Entities/PermissionGroup.php

<?php

    namespace Modules\Usermanager\Entities;

    use Illuminate\Support\Facades\DB;
    use Spatie\Permission\Models\Role;

    class PermissionGroup extends BaseModel
    {

        protected $fillable = [
            'name'
        ];

        public static function getpermissionsByGroupId($id)
        {
            $permissions = DB::table('permissions')->select('name', 'id')->where('permission_group_id', $id)->get();
            return $permissions;
        }

        public function permission()
        {
            return $this->hasMany(Permission::class);
        }

        public function roles($group)
        {
            $permission = Permission::where('permission_group_id', $group->id)->first();

            $data = [];

            $roles = Role::all();

            foreach ($roles as $role) {
                if ($role->hasPermissionTo($permission->name)) {
                    array_push($data, $role);
                }
            }

            return $data;
        }

    }