Change a databasefield on function call

I tried to change a database field everytime a function is called. But it doesn't work. Any ideas or is this complete wrong.

public function changetaskAction($taskitem_id) {

  $task = Tasks::find(array(
    "taskitem_id = $taskitem_id"
    ));

  if (count($task) == 0) {
      $this->flash->error("Task does not exist");
      return $this->forward("tasks/index");
    }

    if ($task->ready="0") {
        $ready = "0";
    } else {
        $ready = "1";
    }
    $task->ready = $ready;
    if ($task->update() == false) {
        foreach ($task->getMessages() as $message) {
            $this->flash->error($message);
        }
      } else {
        $this->flash->success("Task was updated successfully");
        return $this->forward("tasks/index");
    }
  }