我正在编写基于快速的REST服务器。控制器代码的一部分如下:
/*JSON Request format
{ params: {
order_id: <string>, //mandatory
sp_id: <string> , //optional
order_date: <string> //optional
}
}
either "sp_id" or "order_date" ( or even both) would be part of request parameters.
*/
var mongoose = require('mongoose');
var orderSS = require('../models/order');
var sp = require('../models/serviceProvider');
var update_order = function(req, res) {
orderSS.findById(mongoose.Types.ObjectId(req.params.order_id), function(err, order) {
if (err){
return res.json({message:"error", code:500});
}
if (req.params.sp_id){
sp.findById(mongoose.Types.ObjectId(req.params.sp_id, function(err, serviceProvider)){
order.sp_name = serviceProvider.name;
if (req.params.order_date)
order.order_date = req.params.order_date;
order.save(function(err){
if(!err)
return res.json({message:"order update", code:200});
});
});
} else if (req.params.order_date){
order.order_date = req.params.order_date;
order.save(function(err){
if (!err)
return res.json({message: "order updated", code:200});
});
}
});
};
由于调用的异步性,我必须在不同的流程中调用order.save()函数两次。我觉得使用&#34; async&#34;会有更清洁的方法。模块。如果有人可以指导如何做到这一点。
答案 0 :(得分:0)
对于那些有类似问题的人,我能够使用caolan async模块解决这个问题,如下所示。第一次使用这个模块,并惊讶于我们如何干净地管理复杂的异步任务。
var mongoose = require('mongoose');
var async = require('async');
var orderSS = require('../models/order');
var sp = require('../models/serviceProvider');
var update_order = function(req, res) {
orderSS.findById(mongoose.Types.ObjectId(req.params.order_id), function(err, order) {
if (err){
return res.json({message:"error", code:500});
}
async.parallel([
//TASK1
function(callback) {
if (req.params.sp_id) {
sp.findById(mongoose.Types.ObjectId(req.params.sp_id, function(err, serviceProvider)){
order.sp_name = serviceProvider.name;
callback();
});
} else
callback();
},
//TASK2
function(callback) {
if (order.order_date)
order.order_date = req.params.order_date;
callback();
}],
//Below function called once both TASK1 and TASK2 are finished.
function() {
order.save(function(err){
if (!err)
return res.json({message: "order update", code:200});
});
}
});
};