将模型参数传递到猫鼬模型中 [英] Passing model parameters into a mongoose model

问题描述

我有一个与用户模型有关联的猫鼬模型，例如

  var exampleSchema = mongoose.Schema（{
 name：String，
< some more fields> 
 userId：{type：mongoose.Schema.Types.ObjectId，ref：'User'} 
}）; 
 
 var Example = mongoose.model（'Example'，userSchema）
  

当我实例化一个新的模型，我做：

  //用户json对象由一些中间件
 var模型填充= new Example（{name：'example'，....，userId：req.user._id}）; 
  

模型的构造函数需要很多参数，这些参数在模式更改时会写入和重构。有没有办法做这样的事情：

  var model = new Example（req.body，{userId：req.user._id }）; 
  

或者是创建帮助方法来生成JSON对象甚至将userId附加到的最佳方式请求机构？还是有没有想到的方式？

解决方案

  _ = require （下划线）
 
 var model = new示例（_。extend（{userId：req.user._id}，req.body））
  / pre> 
 
 
或如果要将userId复制到req.body：
  var model = new Example（_。extend（req.body，{userId：req.user._id}））
  
 
I have a mongoose model that has an association with a user model e.g. 
var exampleSchema = mongoose.Schema({
   name: String,
   <some more fields>
   userId: { type:mongoose.Schema.Types.ObjectId, ref: 'User' }
});

var Example = mongoose.model('Example', userSchema)
When I instantiate a new model I do:
// the user json object is populated by some middleware 
var model = new Example({ name: 'example', .... , userId: req.user._id });
The model's constructor takes a lot of parameters which has become tedious to write and refactor when the schema changes. Is there way of doing something like:
var model = new Example(req.body, { userId: req.user._id });
Or is the best way to create a helper method to generate a JSON object or even attach the userId to the request body? Or is there way that I haven't even thought of?
解决方案
_ = require("underscore")

var model = new Example(_.extend({ userId: req.user._id }, req.body))
or if you want to copy userId into req.body:
var model = new Example(_.extend(req.body, { userId: req.user._id }))


                        
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