架构数组路径的值无效

我正在尝试构建评论模型，其中包含：Reply 和 CommentThread。 CommentThread包含Reply，而Reply可以递归自身。

/models/comment.js ：

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var replySchema = new Schema({
  username: String,
  timestamp: { type: Date, default: Date.now },
  body: String,
  replies: [replySchema]
}, {_id: true});

var commentThreadSchema = new Schema({
  title: String,
  replies: [replySchema]
});

var Reply = mongoose.model('Reply', replySchema);
var CommentThread = mongoose.model('CommentThread', commentThreadSchema);

module.exports = {
    Reply: Reply,
    CommentThread: CommentThread
};

我的错误消息是：架构数组路径“回复”的值无效。 replySchema 不能使用自身作为值类型吗？还是其他一些原因？

c:\Users\jacki_000\projects\invictusblog\node_modules\mongoose\lib\schema.js:297

      throw new TypeError('Invalid value for schema Array path `'+ prefix + ke
            ^
TypeError: Invalid value for schema Array path `replies`
    at Schema.add (c:\Users\jacki_000\projects\invictusblog\node_modules\mongoos
e\lib\schema.js:297:13)
    at new Schema (c:\Users\jacki_000\projects\invictusblog\node_modules\mongoos
e\lib\schema.js:87:10)
    at Object.<anonymous> (c:\Users\jacki_000\projects\invictusblog\models\comme
nt.js:4:19)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (c:\Users\jacki_000\projects\invictusblog\services\com
ment-service.js:1:83)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)

https://searchcode.com/codesearch/view/6134527/ https://searchcode.com/codesearch/view/6134527/

看上面的例子，你需要做类似的事情

var replySchema = new Schema();
replyschema.add({
  username: String,
  timestamp: { type: Date, default: Date.now },
  body: String,
  replies: [replySchema]
});