Mongoose允许您“分离”模式定义。这样可以实现通用“重用”和代码的清晰性。因此,更好的方法是:
var 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]
});
module.export.App = mongoose.model( "App", appSchema );
因此,如果您愿意将“模式”定义作为各个模块的一部分,并使用“require”系统根据需要导入,那么它就是“干净的”和“可重用的”。如果不想将所有内容都放进“模块”,还可以从“模型”对象中“内省”模式定义。最重要的是,它允许您明确地指定默认值。
对于更复杂的默认值,则可能需要在“pre save”钩子中执行此操作。以下是一个更完整的示例:
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();
}
);
您可以清理该数组并检查模式路径以获取其他级别的默认值。但基本上您要说的是如果未定义该内部数组,则将填充编码的默认值。