class LeavePolicy
{
    /**
     * Determine if the given leave can be updated by the user.
     *
     * @param  AppUser  $user
     * @param  AppLeave  $leave
     * @return bool
     */
    public function update(User $user, Leave $leave)
    {
        if($user->roleIs('manager') {
            return $user->id === $leave->user->manager_id;
        }
        elseif($user->roleIs('user') {
            return $user->id === $leave->user_id;
        }

        return false
    }
}