javascript - NodeJS - Mongoose ，subdoc 对象没有方法 .id() 或 .create()

Question

我正在尝试使用 .create() 插入子文档，并使用 .id() 查询所述文档。我一直在关注指南 here

我收到错误:对象没有方法“id()”或“create()”

下面是我的代码:

/db/schemas/AnnouncementsSchema.js

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


var postSchema = new Schema({
    title: String,
    dateCreated: String,
    dateEdited: { type: Date, default: Date.now() },
    summary: String,
    body: String
});

var announcementsSchema= new Schema({
    categoryName: String,
    posts: [postSchema]
});

announcementsSchema.methods.Update = function (callback) {
    console.log('Updating object: ' + this);

    this.save(function (err, object) {
        callback(err, object);
    });
}

var announcements = mongoose.model('announcements', announcementsSchema);
var post = mongoose.model('post', postSchema);

module.exports = {
    announcements: announcements,
    post: post
};

/routes/Announcements.js

var mongoose = require('mongoose');
var announcementsSchema = require('../../db/schemas/AnnouncementsSchema.js');

exports.InsertPost = function (req, res) {

    var announcements = announcementsSchema.announcements;
    var post =  announcementsSchema.post;

    var categoryToEdit = req.body.categoryToEdit;
    var newPost = req.body.newPost;

    announcements.GetById(categoryToEdit._id, function (err, announcment) {

        var postToAdd = new post(newPost);

        announcment.posts.create(postToAdd);

        announcment.Update(function (err, object) {
            res.send({ err: err, data: object});
        });
    });

}

我包装了 .save 方法，因此我可以在需要时添加额外的功能。当它调用 .create() 时我崩溃了。如果我也尝试删除帖子，情况也是如此。下面是代码:

exports.DeletePost = function (req, res) {

    var announcements = announcementsSchema.announcements;

    var categoryId = req.body.categoryId;
    var postId = req.body.postId;

    announcements.findById(categoryId, function (err, object) {

        var postToDelete = object.posts.id(postId);

        console.log(postToDelete);

        res.end();
    });

}

无论哪种方式，他们都崩溃了，谷歌的答案非常渺茫。大多数人都提供了多种不同的方法来公开模式和模型，而我上面的内容几乎是他们建议的内容的总和。有任何想法吗？谢谢!

Answer 1

我一直在玩弄这个之后找到了答案。这很简单。声明架构的顺序很重要。所以我必须在声明我的父架构之前声明我的子文档架构。如:

var announcementsSchema= new Schema({
    categoryName: String,
    posts: [postSchema]
});

var postSchema = new Schema({
    title: String,
    dateCreated: String,
    dateEdited: { type: Date, default: Date.now() },
    summary: String,
    body: String
});

这成功了!我现在能够保持所有其余代码不变，但现在方法存在了!