node.js - Mongoose :子文档 CastError:转换为数组失败

Question

我有两个模式:架构一(父级):

var slide = require('../model/slide');

var slidesetSchema = new Schema({
    name: String,
    dataID: Schema.Types.ObjectId,
    slides: [slide]
});

和子模式:

var slideSchema = new Schema();
// use this method for a recursive definiton
// src https://groups.google.com/forum/#!topic/mongoose-orm/0yUVXNyprx8
slideSchema.add({
    no: Number,
    depth: Number,
    audio: [{
        name: String,
        dataID: Schema.Types.ObjectId
    }],
    //subslides: [slideSchema] <- this will be the next step if the other problem is solved
    // it will be used to create a tree like structure
});

我遇到以下情况:用户上传了一个 pdf 文件，然后我的 nodejs 服务器为该文件创建了一个新条目(幻灯片集)，它应该为每个页面创建一个幻灯片并将其存储到幻灯片集中。最后，整个事情应该保存到数据库中:

var set = new slideset();
var slides = [];

for (var i = 1; i <= pagecount; i++) {
    var s = new slide({no: i, depth: 1, audio: []});
    slides.push(s);
    // set.slides.push(s); <-- throws "can't call push of undefined",
    // well here http://mongoosejs.com/docs/subdocs.html they just do the same thing.. why doesn't it work for me?!
}
set.slides = slides;
// some other stuff, like writestream to save the file into db, set set.name and dataID
writestream.on('close', function (file) {
     // save schema
     set.save(function (err) {
         console.err(err);
     }
});

“保存”函数抛出以下错误:

ValidationError: CastError: Cast to Array failed for value "{...},{...},..." at path "slides"

我尝试了在 stackoverflow 上找到的各种可能的解决方案，但都没有奏效。我希望你能帮助我:-)

Answer 1

你试过吗:

var Audio = new Schema({
       name: String,
       dataID: Schema.Types.ObjectId    
});

然后

slideSchema.add({
    no: Number,
    depth: Number,
    audio: [Audio]
});

?