当我尝试查找对象的所有者时，出现“未找到对象”错误
我正在尝试渲染。我正在循环播放一组视频剪辑，这些剪辑可以由用户更新或管理。当我登录时，代码工作正常，但是当我尝试使用它并注销时，我收到“排队任务中的异常：TypeError：无法读取 Object.Template.video_info 中未定义的属性“_id”。创建者姓名“
我尝试通过这样做来调试它：
console.log(this.owner);
var owner = Meteor.users.findOne(this.owner);
console.log(owner);
当我检查控制台日志时，我可以看到找到了正确的用户 ID，当我使用此 ID 手动运行 Meteor.users.findOne 时，我得到了一个返回的用户对象。 Meteor 中的时间安排有什么奇怪的地方阻止了这种情况发生吗？
更新：如果我向模板creatorname函数添加一个try...catch，那么会记录2个错误，但模板仍然呈现...???似乎这个模板被调用了两次，一次是在它还没有准备好时，另一次是在它准备好时。为什么会这样呢。
try...catch 块的示例：
Template.video_info.creatorName = function () {
try{
var owner = Meteor.users.findOne(this.owner);
if (owner._id === Meteor.userId())
return "me";
return displayName(owner);
} catch (e){
console.log(e);
}
};
低于此点的原始损坏代码
这是我的 HTML 中的内容：
<body>
<div>
{{> video_list}}
</div>
</body>
<template name="video_list">
<h1>Video List</h1>
{{#each videos}}
<ul>
{{> video_info}}
</ul>
{{else}}
No videos yet.
{{/each}}
<div class="footer">
<button>Like!</button>
</div>
</template>
<template name="video_info">
<li class="video-list {{maybe_selected}}">
<img src="{{image}}" />
<div>
<h3>{{title}}</h3>
<p>{{description}}</p>
<h4>{{creatorName}}</h4>
</div>
</li>
</template>
这是在我的 client.js 中
Meteor.subscribe("videos");
if (Meteor.isClient) {
Template.video_list.videos = function() {
return Videos.find({}, {sort: {title: 1}});
};
Template.video_list.events = {
'click button': function(){
Videos.update(Session.get('session_video'),{$inc: {likes: 1}});
}
}
Template.video_info.maybe_selected = function() {
return Session.equals('session_video', this._id) ? "selected" : "";
}
Template.video_info.events = {
'click': function(){
Session.set('session_video', this._id);
}
}
Template.video_info.creatorName = function () {
var owner = Meteor.users.findOne(this.owner);
if (owner._id === Meteor.userId())
return "me";
return displayName(owner);
};
}
if (Meteor.isServer) {
Meteor.startup(function () {
// code to run on server at startup
});
}
这是在我的 model.js 中
Videos = new Meteor.Collection("videos");
Videos.allow({
insert: function (userId, video) {
return false; // no cowboy inserts -- use createParty method
},
update: function (userId, video, fields, modifier) {
if (userId !== video.owner)
return false; // not the owner
var allowed = ["title", "description", "videoid", "image", "start"];
if (_.difference(fields, allowed).length)
return false; // tried to write to forbidden field
// A good improvement would be to validate the type of the new
// value of the field (and if a string, the length.) In the
// future Meteor will have a schema system to makes that easier.
return true;
},
remove: function (userId, video) {
// You can only remove parties that you created and nobody is going to.
return video.owner === userId; //&& attending(video) === 0;
}
});
var NonEmptyString = Match.Where(function (x) {
check(x, String);
return x.length !== 0;
});
var NonEmptyNumber = Match.Where(function (x) {
check(x, Number);
return x.length !== 0;
});
createVideo = function (options) {
var id = Random.id();
Meteor.call('createVideo', _.extend({ _id: id }, options));
return id;
};
Meteor.methods({
// options should include: title, description, x, y, public
createVideo: function (options) {
check(options, {
title: NonEmptyString,
description: NonEmptyString,
videoid: NonEmptyString,
image:NonEmptyString,
start: NonEmptyNumber,
_id: Match.Optional(NonEmptyString)
});
if (options.title.length > 100)
throw new Meteor.Error(413, "Title too long");
if (options.description.length > 1000)
throw new Meteor.Error(413, "Description too long");
if (! this.userId)
throw new Meteor.Error(403, "You must be logged in");
var id = options._id || Random.id();
Videos.insert({
_id: id,
owner: this.userId,
videoid: options.videoid,
image: options.image,
start: options.start,
title: options.title,
description: options.description,
public: !! options.public,
invited: [],
rsvps: []
});
return id;
},
});
///////////////////////////////////////////////////////////////////////////////
// Users
displayName = function (user) {
if (user.profile && user.profile.name)
return user.profile.name;
return user.emails[0].address;
};
var contactEmail = function (user) {
if (user.emails && user.emails.length)
return user.emails[0].address;
if (user.services && user.services.facebook && user.services.facebook.email)
return user.services.facebook.email;
return null;
};
