Javascript Mongoose架构注册-传递配置信息

注册mongoose模式并使用它们时，传递配置信息的好方法是什么

在下面的例子中，我想让读取首选项和超时值来自配置文件<代码>“读取：['nearest']}，安全：{wtimeout:10000}）”

类似于=>

“read:[dbConfig.readPrefence]}，safe:{wtimeout:dbConfig.writetimeoutms}”，传递dbConfig的好方法是什么？

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

var blogSchema = new Schema({
  title:  String,
  author: String,
  body:   String,
  comments: [{ body: String, date: Date }],
  date: { type: Date, default: Date.now },
  hidden: Boolean,
  meta: {
    votes: Number,
    favs:  Number
  }
}, {read: ['nearest']}, safe: {wtimeout: 10000}));

---

解决方案可能取决于您对文件的组织方式，这意味着您可能要问的是如何将配置传递给多个文件，每个文件都包含一个模式。但是首先看一看这个简单的例子，这个文件中存在一个模式，我建议从那里加载配置并传入值

config.json

{
    "read": "nearest",
    "safe": true
}

my schema.js

var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    config = require('./config.json');

var blogSchema = new Schema({
    title:  String,
    author: String,
    body:   String,
    comments: [{ body: String, date: Date }],
    date: { type: Date, default: Date.now },
    hidden: Boolean,
    meta: {
        votes: Number,
        favs:  Number
    }
}, {
    read: config.read,
    safe: config.safe
});

var mySchema = require("./my-schema.js")(config);

module.exports = function(config) { ... }

如果您有多个模式，并且希望只加载一次配置并传递，那么我建议在模式文件的require调用中发送它。例如：

app.js

var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    config = require('./config.json');

var blogSchema = new Schema({
    title:  String,
    author: String,
    body:   String,
    comments: [{ body: String, date: Date }],
    date: { type: Date, default: Date.now },
    hidden: Boolean,
    meta: {
        votes: Number,
        favs:  Number
    }
}, {
    read: config.read,
    safe: config.safe
});

var mySchema = require("./my-schema.js")(config);

module.exports = function(config) { ... }

my schema.js

var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    config = require('./config.json');

var blogSchema = new Schema({
    title:  String,
    author: String,
    body:   String,
    comments: [{ body: String, date: Date }],
    date: { type: Date, default: Date.now },
    hidden: Boolean,
    meta: {
        votes: Number,
        favs:  Number
    }
}, {
    read: config.read,
    safe: config.safe
});

var mySchema = require("./my-schema.js")(config);

module.exports = function(config) { ... }