Node.js 更新集合时Meteor.flush中的Meteor异常会破坏客户端之间的反应性

当我从前端调用Collection.update（允许方法调用）时，更新工作正常，但会引发下面的异常（在Chrome的JS控制台中，而不是在服务器中）。虽然发生了更新，但连接到同一集合的其他客户端在刷新浏览器之前看不到更新-我怀疑是因为异常

知道这是什么原因吗

Exception from Meteor.flush: Error: Can't create second landmark in same branch
    at Object.Spark.createLandmark (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1085:13)
    at http://checkadoo.com/packages/templating/deftemplate.js?7f4bb363e9e340dbaaea8d74ac670af40ac82d0a:115:26
    at Object.Spark.labelBranch (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1030:14)
    at Object.partial [as list_item] (http://checkadoo.com/packages/templating/deftemplate.js?7f4bb363e9e340dbaaea8d74ac670af40ac82d0a:114:24)
    at http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:349:48
    at Object.Spark.labelBranch (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1030:14)
    at branch (http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:308:20)
    at http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:348:20
    at Array.forEach (native)
    at Function._.each._.forEach (http://checkadoo.com/packages/underscore/underscore.js?772b2587aa2fa345fb760eff9ebe5acd97937243:76:11) 

编辑2

如果在控制台中运行更新调用，也会发生此错误。它发生在更新的第一次运行时，但在与之连接的任何其他浏览器上，反应性都会中断

编辑 以下是触发更新的可单击项的模板：

<template name="list_item">
  <li class="checklistitemli">
  <div class="{{checkbox_class}}" id="clitem_{{index}}">
    <input type="checkbox" name="item_checked" value="1" id="clcheck_{{index}}" class="checklist_item_check" {{checkbox_ticked}}> {{title}}
  </div>
  </li>
</template>

---

整个东西都可以在（我的一个基于Tornado的Python应用程序的端口）上找到。

我发现这通常是一个重复ID的问题@Harel的问题不包括实际呈现集合的代码，因此我们无法说出问题的根本原因，但注释中提供的@Drew的repu抛出了此错误，因为它呈现的对象数组具有重复的“\u id”值

我制作了一个@Drew's Repo的工作版本：

关键修复是确保插入的饮料项目没有重复的“\u id”字段：

  Template.drink_from_menu.events({
    'click .buy_drink': function () {
      var drink = {name: this.name, price: this.price};

      console.log("this = ", this);

      // using 'this' doesn't work because it already has a '_id' field and 
      // you would be trying to render multiple drinks with the same id
      // which causes Spark to throw the "Can't create second landmark 
      // in same branch" error
      //Tabs.update({_id:Session.get('tabId')}, {$push: {ordered_drinks: this}});

      // either ensure that the objects you want Spark to render have a 
      // unique id or leave off the _id completely and let Spark do it for you
      Tabs.update({_id:Session.get('tabId')}, {$push: {ordered_drinks: drink}});
    }
  });

---

也许可以向我们展示你是如何呈现正在更新的收藏的？我认为问题不在于没有关闭

，而在于我对这个问题的模糊理解（与此相关）我想，如果不看到调用

list\u item

本身的上下文，就很难对此有所帮助。我也遇到了这个问题。这里展示了一个简单的应用程序：要复制，请在控制台上创建一个带有

选项卡的选项卡。插入（{owner:“foo”}）

然后访问

localhost:3000/Tabs/：id

然后单击“买一个”按钮EZ刚刚注意到了该操作的名称-这是一个小世界Harel:D

  Template.drink_from_menu.events({
    'click .buy_drink': function () {
      var drink = {name: this.name, price: this.price};

      console.log("this = ", this);

      // using 'this' doesn't work because it already has a '_id' field and 
      // you would be trying to render multiple drinks with the same id
      // which causes Spark to throw the "Can't create second landmark 
      // in same branch" error
      //Tabs.update({_id:Session.get('tabId')}, {$push: {ordered_drinks: this}});

      // either ensure that the objects you want Spark to render have a 
      // unique id or leave off the _id completely and let Spark do it for you
      Tabs.update({_id:Session.get('tabId')}, {$push: {ordered_drinks: drink}});
    }
  });