今天下午捣鼓了一下小应用，使用老赵的jscex给mongoose添加了Async 同步方法，感觉还不错，至少对我来说相当节省开发效率，分享一下。
给mongoose添加jscex的方法很简单，只需要使用老赵的 ”Jscex异步增强模块“进行异步操作绑定即可，什么是”Jscex异步增强模块“在此我就不缀述了，感兴趣的同学直接访问 Jscex异步增强模块 即可。这里仅贴出mongoose的异步操作绑定代码，代码比较简单，就不一一说明了。
先贴一个加载异步增强模块的代码，我事先用npm安装了jscex，命令如下” npm install jscex jscex-jit jscex-async”，详细请看赵姐夫的说明，链接地址：https://github.com/JeffreyZhao/jscex/blob/master/README-cn.md
var Jscex = require("jscex");
require("jscex-jit").init(Jscex);
require("jscex-async").init(Jscex);
require("./jscex-async-powerpack").init(Jscex);
module.exports = Jscex;
有了jscex，剩下就是加语法糖的代码了，只需做个简单的绑定
var mongoose = require('mongoose'),
Jscex = require('../plugins/jscex-start'),
Model = mongoose.Model;
var Async = Jscex.Async;
var Task = Async.Task;
var Jscexify = Async.Jscexify;
//真坑爹，mardown居然有小于号就显示不正确
var addSugarMethods = function(methods , obj){
for(var i = 0,len = methods.length; i 小于 len ; i++){
if(obj[methods[i]])
obj[methods[i] + 'Async'] = Jscexify.fromStandard(obj[methods[i]]);
}
}
module.exports = {
init : function(){
addSugarMethods(['save','remove'],Model.prototype);
},
model : function(name ,schema){
mongoose.model(name, schema);
var methods = ['find','remove','findById','findOne','count','distinct','create','update'];
var model = mongoose.model(name);
addSugarMethods(methods,model);
}
}
好了，下面以node-club源码里的User 对象做个例子测试一下
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var modelAsync = require('./modelAsync');
var UserSchema = new Schema({
//用户昵称
name: {
type: String,
index: true
},
//用户登录名称:唯一
loginname: {
type: String
},
//登录密码
pass: {
type: String
},
//邮箱
email: {
type: String
},
//个人主页
url: {
type: String
},
//住址
location: {
type: String
},
//个性签名
signature: {
type: String
},
//个人简介
profile: {
type: String
},
//微薄
weibo: {
type: String
},
//头像
avatar: {
type: String
},
//被关注的人数
follower_count: {
type: Number,
default: 0
},
//关注的人数
following_count: {
type: Number,
default: 0
},
//创建时间
create_at: {
type: Date,
default: Date.now
},
//更新时间
update_at: {
type: Date,
default: Date.now
},
//是否活动状态
active: {
type: Boolean,
default: true
}
});
modelAsync.model('User', UserSchema);
----------------------分割线----------------------------------
var mongoose = require('mongoose'),
config= require('../config').config,
modelAsync = require('./modelAsync');
modelAsync.init();
mongoose.connect(config.db, function(err){
if(err){
console.log('connect to db error: ' + err.message);
process.exit(1);
}
});
// models
require('./user');
exports.User = mongoose.model('User');
上面代码取自node-club里的源码，至此就可以用同步的写法去获取数据了，测试代码如下
var models = require('../../models'),
User = models.User,
should = require('should'),
Jscex = require('../../plugins/jscex-start');
module.exports = {
'test updating documents async': function () {
var saveUserAsync = eval(Jscex.compile("async", function (user) {
$await(user.saveAsync());
var _user = $await(User.findAsync({ _id : user._id }));
should.exist(_user);
_user.should.have.length(1);
}));
var user = new User();
user.name = 'flyhuang';
user.loginname = 'hpf1908';
user.pass = '123456';
user.email = 'hpf1908[@gmail](/user/gmail).com';
var task = saveUserAsync(user);
task.start();
},
'test delete documents async' : function(){
var removeUserAsync = eval(Jscex.compile("async", function (user) {
$await(user.saveAsync());
$await(User.removeAsync({ name : user.name }));
var _user = $await(User.findAsync({ name : user.name }));
_user.should.be.empty;
}));
var user = new User();
user.name = 'flyhuang';
user.loginname = 'hpf1908';
user.pass = '123456';
user.email = 'hpf1908[@gmail](/user/gmail).com';
var task = removeUserAsync(user);
task.start();
}
}
看上面的例子是否觉得同步写法更简明易懂了？当然如果你不喜欢这样的写法也可以继续使用异步的方式，再贴一个用异步写法的例子，以作对比
var models = require('../../models'),
User = models.User,
should = require('should');
module.exports = {
'test updating documents': function () {
var user = new User();
user.name = 'flyhuang';
user.loginname = 'hpf1908';
user.pass = '123456';
user.email = 'hpf1908[@gmail](/user/gmail).com';
user.save(function (err) {
should.strictEqual(err, null);
User.find({ _id : user._id },function(err , user){
should.strictEqual(err, null);
should.exist(user);
user.should.have.length(1);
console.log('done');
});
});
},
'test delete documents' : function(){
var user = new User();
user.name = 'flyhuang';
user.loginname = 'hpf1908';
user.pass = '123456';
user.email = 'hpf1908[@gmail](/user/gmail).com';
user.save(function (err) {
should.strictEqual(err, null);
User.remove({ name : 'flyhuang' },function(err ){
should.strictEqual(err, null);
User.find({ name : 'flyhuang'},function(err , user){
should.strictEqual(err, null);
user.should.be.empty;
console.log('done');
});
});
});
}
}