无法获得蓝鸟承诺和猫鼬的save()在node.js中工作 [英] Unable to get bluebird promise and mongoose's save() to work in node.js

问题描述

有人可以帮我弄清楚如何在Promise中重写以下工作代码吗?我想执行插入查询，然后通过socket.js

Can anyone help me figure out how to rewrite the following working code in promise? I want to execute an insert query and then send the data back to clients via socket.js

  var func = require("functions")
  var mongoose = require('mongoose');
  var mongo_models = require('./database/mongo_model')(mongoose);
  var Promise = require("bluebird");

  socket.on("submit",function(d){ 
   if(d[0].src !== undefined)
   {
      var data = func.clear(sanitizer,d),
      tab = new mongo_models.Tab({avg:0,post:data});
      tab.save(function(err,tw){
        io.sockets.in('index').emit("update",tw)
      })
   }
  });

我尝试了以下代码，但是我从console.log(b)获取了undefined.显然save()没有返回任何结果. 承诺:

I have tried the following code but I'm getting undefined from console.log(b). Apparently the save() isn't returning any result. Promise:

  socket.on("submit",function(d){ 
   if(d[0].src !== undefined)
   {
    Promise.props({
       one: func.clear(sanitizer,d)
    }).then(function(a){

       return new mongo_models.Tab({avg:0,post:a.one}).save();

    }).then(function(b){

       console.log(b); // undefined
       io.sockets.in('index').emit("update",b) 

    }).catch(function (error) {
       console.log(error);
    })
   }
  });

推荐答案

在Mongoose中，保存是有问题的，因为Promise返回那里的函数的规则是一个例外.

Save is problematic in Mongoose as being an exception to the rule of promise returning functions there.

我强烈建议您使用显示saveAsync函数的bluebird来使猫鼬成瘾:

I highly recommend that you promisify mongoose using bluebird which exposes a saveAsync function:

var Promise = require("bluebird");
var func = require("functions")
var mongoose = Promise.promisifyAll(require('mongoose'));
var mongo_models = require('./database/mongo_model')(mongoose);

然后以以下方式返回异步调用:

And then return the async call as:

   //                                            Note the suffix
   return new mongo_models.Tab({avg:0,post:a.one}).saveAsync();

这篇关于无法获得蓝鸟承诺和猫鼬的save()在node.js中工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！