Mongoose Schema嵌入文档默认
问题描述:
我想嵌入一个文档,所以我猜一个子文档,到Mongoose架构。我一直遵循Mongoose documentation提出的这种模式。我的模式看起来像这样。Mongoose Schema嵌入文档默认
var CategoriesSchema = new Schema({
name: { type: String, required: true, default: 'default' }
});
var PostSchmea = new Schema({
title: { type: String, required: true, default: 'default title' },
writtenBy: { type: ObjectId, required: true, default: '55878003ebf4b06110ef2ff8' },
publishedOn: { type: Date, default: Date.now },
updatedOn: Date,
published: { type: Boolean, required: true, default: false },
content: { type: String, required: true, default: 'empty' },
category: { type: [CategoriesSchema] },
tags: [String],
images: [String]
});
正如您所看到的,我已将CategoriesSchema嵌入到PostSchema中。我的问题是如何为PostSchema中的类别键设置默认值。我尝试以下,并得到了错误“类型错误:无法读取属性未定义‘$ __’”:
var PostSchmea = new Schema({
title: { type: String, required: true, default: 'default title' },
writtenBy: { type: ObjectId, required: true, default: '55878003ebf4b06110ef2ff8' },
publishedOn: { type: Date, default: Date.now },
updatedOn: Date,
published: { type: Boolean, required: true, default: false },
content: { type: String, required: true, default: 'empty' },
category: { type: [CategoriesSchema], default: [CategoriesSchema] },
tags: [String],
images: [String]
});
而且我也试过以下,并得到了错误“语法错误:意外令牌”:
var PostSchmea = new Schema({
title: { type: String, required: true, default: 'default title' },
writtenBy: { type: ObjectId, required: true, default: '55878003ebf4b06110ef2ff8' },
publishedOn: { type: Date, default: Date.now },
updatedOn: Date,
published: { type: Boolean, required: true, default: false },
content: { type: String, required: true, default: 'empty' },
category: { type: [CategoriesSchema], default: new CategoriesSchema(name: "default") },
tags: [String],
images: [String]
});
任何建议或文件将不胜感激。
谢谢,
答
我相信问题可能在于您的依赖声明。我用你的代码来声明mongoose模式,并且它工作正常,但是你没有包含你的依赖关系,或者你的创建方法,所以让我告诉你我是如何创建记录的,并且我希望这会有所帮助。您也可以参考这个堆栈溢出的答案为的ObjectId的依赖性声明:How to set ObjectId as a data type in mongoose
这里是我的代码:
//contents of *.js
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var ObjectId = Schema.ObjectId;
var CategoriesSchema = new Schema({
name: { type: String, required: true, default: 'default' }
});
var PostSchmea = new Schema({
title: { type: String, required: true, default: 'default title' },
writtenBy: { type: ObjectId, required: true, default: '55878003ebf4b06110ef2ff8' },
publishedOn: { type: Date, default: Date.now },
updatedOn: Date,
published: { type: Boolean, required: true, default: false },
content: { type: String, required: true, default: 'empty' },
category: { type: [CategoriesSchema], default: [CategoriesSchema] },
tags: [String],
images: [String]
});
mongoose.model('Post', PostSchmea);
mongoose.model('Categories',CategoriesSchema);
然后我宣布我server.js文件中的架构和模式来运行代码和创建一个记录:
//contents of my server.js file (or wherever you put your controllers)
var stack = require('./app/models/*'),
post = mongoose.model('Post');
var v = new post({
//Define your values here
});
v.save(function(err,docs) {
if (err) {
console.log(err)
} else {
console.log(docs)
}
});
这成功创建了所有定义的默认值的记录。希望有所帮助。
感谢您的回答!我要测试一下,如果有效,我会告诉你。再次感谢! –
这不适用于猫鼬4+。 存在嵌入文档无法识别父文件的问题 – lobengula3rd