Question

我玩一个简单的Meteor Angular 2应用程序，只能从数据库中读取。我有另一个更改数据库的应用程序。但是当数据库发生变化时，我在Meteor应用程序上出错了。

Exception in queued task: EXCEPTION: Error in client/match.html:0:19
ORIGINAL EXCEPTION: TypeError: Cannot read property 'league' of undefined
ORIGINAL STACKTRACE:
TypeError: Cannot read property 'league' of undefined
at DebugAppView._View_MatchComponent0.detectChangesInternal (MatchComponent.template.js:101:59)
at DebugAppView.AppView.detectChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57326:14)
at DebugAppView.detectChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57415:44)
at DebugAppView.AppView.detectViewChildrenChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57346:34)
at DebugAppView._View_MatchesComponent1.detectChangesInternal (MatchesComponent.template.js:106:8)
at DebugAppView.AppView.detectChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57326:14)
at DebugAppView.detectChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57415:44)
at DebugAppView.AppView.detectContentChildrenChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57341:37)
at DebugAppView._View_MatchesComponent0.detectChangesInternal (MatchesComponent.template.js:65:8)
at DebugAppView.AppView.detectChanges (http://localhost:3001/packages/modules.js?hash=5bea6cc36ccb7076b2a2834b250a3c141ff0cd78:57326:14)
ERROR CONTEXT:
[object Object]

我使用autopublish收集：

import {Mongo} from 'meteor/mongo';
export let MatchCollection = new Mongo.Collection('matches');

和角度分量：

export class MatchesComponent
{
    matches;
    constructor() {
        this.matches = MatchCollection.find();
    }
}

注意：Meteor Blaze版本效果很好。我是Meteor Angular2的新手。

感谢您的帮助。

Answer 1

我猜您使用的是*ngFor。

您可以使用这种更稳定的方式

this.matches = MatchCollection.find().fetch();

MatchCollection.find();返回Mongo.Cursor<any>;

MatchCollection.find().fetch();返回Array<any>

很奇怪，bug应该已经修好了......

Answer 2

看起来外部更改删除了文档中的属性名称<?php /** * This example shows sending a message using PHP's mail() function. */ require 'PHPMailerAutoload.php'; //Create a new PHPMailer instance $mail = new PHPMailer; //Set who the message is to be sent from $mail->setFrom('someemail@gmail.com', 'Admin'); //Set who the message is to be sent to $mail->addAddress('someemail@yahoo.com', 'First Last'); //Set the subject line $mail->Subject = 'This is the subject'; //Read an HTML message body from an external file, convert referenced images to embedded, //convert HTML into a basic plain-text alternative body //$mail->msgHTML(file_get_contents('contents.html'), dirname(__FILE__)); //Replace the plain text body with one created manually $mail->IsHTML(false); $mail->Body = 'This is a test'; $mail->AltBody = 'This is a plain-text message body'; //Attach an image file //$mail->addAttachment('images/phpmailer_mini.png'); //send the message, check for errors if (!$mail->send()) { echo "Mailer Error: " . $mail->ErrorInfo; } else { echo "Message sent!"; }，您的angular2视图会在某处使用。

通过league查看文档，了解文档在外部流程修改之前和之后的样式。

流星Angular2和Mongodb的外部变化

2 个答案: