Javascript 将默认值设置为节点js中的mongoose数组

Javascript 将默认值设置为节点js中的mongoose数组,javascript,node.js,mongodb,mongoose,mongodb-query,Javascript,Node.js,Mongodb,Mongoose,Mongodb Query,在我的模型定义中,我有: appFeatures: [{ name: String, param : [{ name : String, value : String }] }] 我想将默认值设置为appFeatures,例如: 名称:“功能”, param:[{name:'param1',value:'1'},{name:'param2',value:'2'}] 我试着用手做这件事 app

在我的模型定义中,我有:

appFeatures: [{
        name: String,
        param : [{
            name : String,
            value : String
        }]
    }]
我想将默认值设置为appFeatures,例如: 名称:“功能”, param:[{name:'param1',value:'1'},{name:'param2',value:'2'}]

我试着用手做这件事

appFeatures : { type : Array , "default" : ... }
但它不起作用,有什么想法吗

感谢

Mongoose允许您“分离”模式定义。既可用于一般的“重用”,也可用于代码的清晰性。因此,更好的方法是:

// general imports
var mongoose = require('mongoose'),
    Schema = mongoose.Schema;

// schema for params
var paramSchema = new Schema({
    "name": { "type": String, "default": "something" },
    "value": { "type": String, "default": "something" }
});

// schema for features
var featureSchema = new Schema({
    "name": { "type": String, "default": "something" }
    "params": [paramSchema]
});

var appSchema = new Schema({
    "appFeatures": [featureSchema]
});

// Export something - or whatever you like
module.export.App = mongoose.model( "App", appSchema );
因此,如果您愿意将“模式”定义作为单个模块的一部分,并根据需要使用“require”系统进行导入,那么它是“干净的”和“可重用的”。如果不想“模块化”所有内容,甚至可以从“模型”对象“内省”模式定义

不过,它主要允许您为默认设置明确指定“您想要什么”

对于更复杂的默认设置,您可能希望改为在“预保存”挂钩中执行此操作。作为更完整的示例:

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

var paramSchema = new Schema({
  "name": { "type": String, "default": "something" },
  "value": { "type": String, "default": "something" }
});

var featureSchema = new Schema({
  "name": { "type": String, "default": "something" },
  "params": [paramSchema]
});

var appSchema = new Schema({
  "appFeatures": [featureSchema]
});

appSchema.pre("save",function(next) {
  if ( !this.appFeatures || this.appFeatures.length == 0 ) {
    this.appFeatures = [];
    this.appFeatures.push({
      "name": "something",
      "params": []
    })
  }

  this.appFeatures.forEach(function(feature) {
    if ( !feature.params || feature.params.length == 0 ) {
      feature.params = [];
      feature.params.push(
       {  "name": "a", "value": "A" },
       {  "name": "b", "value": "B" }
      );
    }
  });
  next();
});


var App = mongoose.model( 'App', appSchema );

mongoose.connect('mongodb://localhost/test');


async.series(
  [
    function(callback) {
      App.remove({},function(err,res) {
        if (err) throw err;
        callback(err,res);
      });
    },
    function(callback) {
      var app = new App();
      app.save(function(err,doc) {
        if (err) throw err;
        console.log(
          JSON.stringify( doc, undefined, 4 )
        );
        callback()
      });
    },
    function(callback) {
      App.find({},function(err,docs) {
        if (err) throw err;
        console.log(
          JSON.stringify( docs, undefined, 4 )
        );
        callback();
      });
    }
  ],
  function(err) {
    if (err) throw err;
    console.log("done");
    mongoose.disconnect();
  }
);

您可以清理这些内容并内省模式路径,以获得其他级别的默认值。但是您基本上想说,如果没有定义内部数组,那么您将按照编码填写默认值。

谢谢,您能解释一下如何添加两个featureSchema吗?比如我的例子?再次感谢@塔列维:当然。添加了一个添加两个内部项的更完整示例。