检查数组是否包含对象nodejs

Question

我正在尝试查看来自 mongodb 数据库的数组是否包含特定对象，但我无法让它工作。

我一直在寻找不同的解决方案并尝试了所有方法； Array.some、Array.includes、Array.indexOf 等。

我对此很陌生，所以我可能有一些误解，有人知道我做错了什么吗？该应用程序正常启动，没有错误消息，但它说每个人都是“领导者”，而他们不是。

<div class="ui three buttons">
        <% if(task.leaders.includes(currentUser)){ %>
          <button form="deleteTaskForm" class="ui basic negative button"><i class="ui icon trash alternate"></i></button> 
          <a class="ui basic orange button" href="/task/<%= task._id %>/edit"><i class="ui icon edit"></i></a> <% }
          else{ %>
          <div style="opacity: 40%;" class="ui basic negative button popupButton" data-content="Only the leader of the task can remove this task."><i class="ui icon trash alternate"></i></div>
          <div style="opacity: 40%;" class="ui basic orange button popupButton" data-content="Only the leader of the task can edit this task."><i class="ui icon edit"></i></div>
          <% } %>
        <button form="doneTaskForm" class="ui basic green button"><i class="ui icon check square"></i></button>
      </div>

Array.prototype.some()

<div class="ui three buttons">
        <% if(task.leaders.some(leader => leader._id == currentUser._id)){ %>
          <button form="deleteTaskForm" class="ui basic negative button"><i class="ui icon trash alternate"></i></button> 
          <a class="ui basic orange button" href="/task/<%= task._id %>/edit"><i class="ui icon edit"></i></a> <% }
          else{ %>
          <div style="opacity: 40%;" class="ui basic negative button popupButton" data-content="Only the leader of the task can remove this task."><i class="ui icon trash alternate"></i></div>
          <div style="opacity: 40%;" class="ui basic orange button popupButton" data-content="Only the leader of the task can edit this task."><i class="ui icon edit"></i></div>
          <% } %>
        <button form="doneTaskForm" class="ui basic green button"><i class="ui icon check square"></i></button>
      </div>

编辑：已解决。这是让它为我工作的解决方案。

<div class="ui three buttons">
        <% if(task.leaders.some(leader => leader._id.equals(currentUser._id))){ %>
          <button form="deleteTaskForm" class="ui basic negative button"><i class="ui icon trash alternate"></i></button> 
          <a class="ui basic orange button" href="/task/<%= task._id %>/edit"><i class="ui icon edit"></i></a> <% }
          else{ %>
          <div style="opacity: 40%;" class="ui basic negative button popupButton" data-content="Only the leader of the task can remove this task."><i class="ui icon trash alternate"></i></div>
          <div style="opacity: 40%;" class="ui basic orange button popupButton" data-content="Only the leader of the task can edit this task."><i class="ui icon edit"></i></div>
          <% } %>
        <button form="doneTaskForm" class="ui basic green button"><i class="ui icon check square"></i></button>
      </div>

Answer 1

比较对象是 javascript 上的一项繁重任务，您需要比较唯一对象属性的解决方案

if (task.leaders.some(lead => lead.user.id == currentUser.id)) {
  // Do something
}

阅读Array.prototype.some()这里https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some

如果您的情况需要比较对象，您也可以使用https://lodash.com/docs/#isEqual

编辑：

如果您比较 mongodb ObjectId，您需要这样做 https://stackoverflow.com/a/11638106/10216251 ObjectId 的原始结果不是纯字符串，因此您无法使用 == 进行比较