MongoDB/Meteor：为每个数组元素添加唯一ID

Question

如何向此结构中的每个数组元素添加唯一ID？元素的数量是可变的，所以我需要一个动态的解决方案。

{ 
    "_id" : "wLXDvjDvbsxzfxabR", 
    "group" : [ 
     { 
      "title" : "title 1", 
      "data" : [ 
       { 
        "note" : "text" 
       } 
      ] 
     }, 
     { 
      "title" : "title 2", 
      "data" : [ 
       { 
        "note 1" : "text" 
       }, 
       { 
        "note 2" : "text" 
       }, 
       { 
        "note 3" : "text" 
       } 
      ] 
     } 
    ] 
} 

该ID应添加到所有组元素和所有数据元素。结果应该是这样的：

{ 
    "_id" : "wLXDvjDvbsxzfxabR", 
    "group" : [ 
     { 
      "id" : "dfDFSfdsFDSfdsFws", 
      "title" : "title 1", 
      "data" : [ 
       { 
        "id" : "efBDEWVvfdvsvsdvs", 
        "note" : "text" 
       } 
      ] 
     }, 
     { 
      "id" : "fdsfsFDSFdsfFdsFd", 
      "title" : "title 2", 
      "data" : [ 
       { 
        "id" : "WVvfsvVFSDWVDSVsv", 
        "note 1" : "text" 
       }, 
       { 
        "id" : "qqdWSdksFVfSVSSCD", 
        "note 2" : "text" 
       }, 
       { 
        "id" : "MZgsdgtscdvdsRsds", 
        "note 3" : "text" 
       } 
      ] 
     } 
    ] 
} 

Answer 1

这应该通过对象迭代

function generateId() { 
    // you'll have to write this yourself 
} 

function addId(obj) { 
    if (Object.prototype.toString.call(obj).indexOf('Array') >= 0) { 
     obj.forEach(function(item) { 
      item.id = item.id || generateId(); 
      addId(item); 
     }); 
    } 
    else if (typeof obj == 'object') { 
     Object.keys(obj).forEach(function(key) { 
      addId(obj[key]); 
     }); 
    } 
} 

使用

addId(yourObject);