获取父元素及其所有子元素的数组

假设我有这种数据......

data = [{
    "_id" : "1",
    "parentId" : "thisPostId",
    "topLevelId" : "1",
    "text" : "
comment
",
},
{
    "_id" : "2",
    "parentId" : "1",
    "topLevelId" : "1",
    "text" : "
reply to comment
",
},
{
    "_id" : "3",
    "parentId" : "2",
    "topLevelId" : "1",
    "text" : "
reply to reply to comment
",
},
{
    "_id" : "4",
    "parentId" : "3",
    "topLevelId" : "1",
    "text" : "
reply to reply to reply to comment
",
}]

我需要删除评论及其所有孩子......

如果注释删除是_id:1,那么我需要一个数组["1","2","3","4"],,,然后我可以运行Coll.remove({_id:{$in:["1","2","3","4"]}}, callback);

如果注释要删除_id:2,那么我需要一个数组["2","3","4"]

如果注释要删除_id:3,那么我需要一个数组["3","4"]

如果注释要删除_id:4,那么我需要一个数组["4"]

我试过这个(不知道)......

_.forEach(data, function(value, key){
    _.pluck(_.where(key, { "parentId" : "2" }), '_id');
});

并没有工作......

任何有关javascript/lodash/underscore的帮助将不胜感激,,,

谢谢...