Question

我从同时进入此添加历史记录页面的两个客户端推送子行记录（添加历史记录）时出错。如果只推送子记录逐个客户端（即，输入添加历史记录页面以在客户端1中推送记录，然后输入添加历史记录页面以推送记录），它可以正常工作。

AngularJS中是否需要一些记录锁定处理？

NodeJS服务中的错误是：

Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:344:11)
    at ServerResponse.header (/home/oracle/node/ang_backend1/node_modules/express/lib/response.js:718:10)
    at ServerResponse.send (/home/oracle/node/ang_backend1/node_modules/express/lib/response.js:163:12)
    at ServerResponse.json (/home/oracle/node/ang_backend1/node_modules/express/lib/response.js:249:15)
    at /home/oracle/node/ang_backend1/routes/datas.js:53:21
    at /home/oracle/node/ang_backend1/node_modules/mongoose/lib/model.js:3324:16
    at /home/oracle/node/ang_backend1/node_modules/mongoose/lib/document.js:1924:15
    at nextTickCallbackWith0Args (node.js:420:9)
    at process._tickCallback (node.js:349:13)

它还会导致后端nodejs停止并需要重启。

HistoryaddController是：

.controller('HistoryaddController', function($scope, $cordovaNetwork, $ionicPopup, $rootScope, $filter, $state, $stateParams, Movie, $ionicLoading, $ionicPlatform, $ionicHistory, $http, $timeout) {

    $scope.loadMovie = function() {

        $scope.movie = Movie.get({ id: $stateParams.id }).$promise.then(function(results) {
            console.log(results);
            $scope.movie = results;
        });
    };
    $scope.loadMovie();

    $scope.themovie = {
        details: '',
    };

    $scope.updateMovie = function() {

        $scope.movie.Histories.push($scope.themovie);
        $scope.movie.$update(function() {
            $state.go('movies');
        });
    };
})

此系列的后端mongo模型是：

var mongoose = require('mongoose');
var autoIncrement = require('mongoose-auto-increment');
mongoose.Promise = global.Promise;
var connection = mongoose.createConnection("mongodb://localhost:27017/mymongodb");
autoIncrement.initialize(connection);
var Schema = mongoose.Schema;
var DataSchema = new Schema({
    sort: { type: Schema.Types.ObjectId, ref: 'Sort' },
    custname: String,
    problem: String,
    opendate: { type: Date, default: Date.now },
    enddate: { type: Date },
    lastupdate: { type: Date },
    assignedon: { type: Date },
    openby: String,
    updateby: String,
    assignedto: String,
    severity: String,
    product: String,
    srstatus: String,
    reportby: String,
    custowner: String,
    vendorid: String,
    Histories: [{
        details: String
    }]
});

DataSchema.plugin(autoIncrement.plugin, 'Data');
module.exports = mongoose.model('Data', DataSchema);

后端路线是：

var Data = require('../app/models/data'); // get the mongoose model
var express = require('express');

var router = express.Router();

router.route('/:id')
    .put(function(req, res) {
        Data.findOne({ _id: req.params.id }, function(err, data) {

            if (err)
                res.send(err);

            for (prop in req.body) {
                data[prop] = req.body[prop];
            }

            // save the movie
            data.save(function(err) {
                if (err)
                    res.send(err);
                res.json({ message: 'Data updated!' });
            });

        });
    })

<form name="myForm1">
<ion-view title="Add Detail">
  <ion-header-bar align-title="center" class="bar-balanced">
    <ion-nav-bar align-title="center" class="nav-title-slide-ios7 bar-balanced">
      <ion-nav-back-button class="button-icon ion-arrow-left-c">
      </ion-nav-back-button>
    </ion-nav-bar>
  </ion-header-bar>

  <ion-content overflow-scroll="true" class="padding">
    <div class="list"  >
      <label class="item item-input">
        <input type="text" placeholder="customer" ng-model="movie.custname" required>
      </label>
      <label class="item item-input">
        <input type="text" placeholder="problem" ng-model="movie.problem" required>
      </label>
      <label class="item item-input">
        <textarea ng-trim="false" rows=8 placeholder="Details" ng-model="themovie.details" required></textarea>
      </label>
        </div>
    <button class="button button-full button-balanced" clicked-disable ng-disabled="myForm1.$invalid" ng-click="updateMovie()">
      Add
    </button>
  </ion-content>
</ion-view>
</form>

赞赏你是否可以指出我应该解决的问题。我得到的问题是当两个客户端应用程序（即客户端app1和客户端应用程序2）进入此Historiesadd页面时 - ＆gt;输入记录 - ＆gt;保存。它会得到这个错误。如果client1进入此Historiesadd页面 - ＆gt;输入记录 - ＆gt;保存。然后client2进入此Historiesadd页面 - ＆gt;输入记录 - ＆gt;保存。它不会得到这个错误。这意味着，第二个客户端无法进入Histroiesadd页面，直到第一个客户端成功保存记录。它可以避免这个错误。我不确定它是后端节点表达问题还是fontend Angular。感谢

Answer 1

我认为问题依赖于此。

 for (prop in req.body) {
      data[prop] = req.body[prop];
  }

 // save the movie
 data.save(function(err) {
 if (err)
     res.send(err);
     res.json({ message: 'Data updated!' });
 });

您尝试在重新发送后将json重新发送回客户端。确保在返回json之前已完成保存。尝试将res.json置于回调之外

 // save the movie
 data.save(function(err) {
 if (err)
     res.send(err);
 });

 res.json({ message: 'Data updated!' });

在ServerResponse.OutgoingMessage.setHeader（_http_outgoing.js：344：11）

1 个答案: