向流星文档添加子项

Question

我有一个具有以下数据结构的流星集合 "list"。

   "list" : [
  {
     "_id" : "id",
     "author" : "authorId",
     "createdOn" : "DateTime",
     "description" : "description",
     "items" : [
        {
           "item1" : {
              "itemComplete" : "Boolean",
              "itemName" : "item name",
              "itemDescription" : "item description",
           }
        },
        {
           "item2" : {
              "itemComplete" : "Boolean",
              "itemName" : "item name",
              "itemDescription" : "item description",
           }
        }
     ],

用户将能够添加任意数量的列表项。我想弄清楚如何以编程方式添加 itemX。例如。我有以下代码（不起作用）可以让我了解我要完成的工作。

 var currentItemCount = Lists.find({_id:_currentListId, items:{}}).count() + 1;
 var newItemNum = "item" + currentItemCount;
 var newListItem = $("#list-item").val(); 
 Lists.update({_id:_currentListId},{$push : {items:{newItemNum:{itemName:newListItem}}}});

如果有任何建议或提示可以帮助我修复代码，我将不胜感激。如果我遗漏了一些信息，请告诉我。

提前致谢。

卡迈勒

Answer 1

试试这样的东西：

// fetch the current list
var list = Lists.findOne(_currentListId);

// find the number of existing items and handle the case where there are none
var numItems = (list.items || []).length;

// the the next item key will be one more than the length
var itemKey = 'item' + (numItems + 1);

// extract the item name from a form
var itemValue = {itemName: $('#list-item').val()};

// you can't use varaiable names as keys in object literals
// so we have to use bracket notation
item = {};
item[itemKey] = itemValue;

// push the new item onto the list of items
Lists.update(_currentListId, {$push: {items: item}});

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