在 Meteor 中访问订阅的问题 [英] Issue with accessing subscriptions in Meteor

问题描述

我对我正在尝试开发的 Meteor 应用程序中的模板助手中的异常"错误感到沮丧.

I'm getting frustrated at an 'Exception in template helper' error in a Meteor application I'm trying to develop.

在/lib/collections.js 我有:

In /lib/collections.js I have:

Categories = new Meteor.Collection("categories");
Venues = new Meteor.Collection("venues");
VenuesAndUsers = new Meteor.Collection("venuesAndUsers");

在/server/main.js 我有:

In /server/main.js I have:

Meteor.publish("Categories", function () {
    return Categories.find({}, {sort: {order: 1}});
});
Meteor.publish("Venues", function () {
    return Venues.find();
});
Meteor.publish("VenuesForUser", function () {
    return VenuesAndUsers.find();
});

在/lib/router.js 我有:

In /lib/router.js I have:

Router.configure({
    // Other stuff

    waitOn: function() {
        return [
            Meteor.subscribe('Categories'),
            Meteor.subscribe('Venues'),
            Meteor.subscribe('VenuesForUser'),
        ];
    }
});

在/client/templates/list.html 我有:

In /client/templates/list.html I have:

{{#each xzz}}
    {{name}} - {{id}}<br />
{{/each}}

{{#each venues}}
    {{venueId}} - {{userId}}<br />
{{/each}}

在/client/templates/list.js 我有:

In /client/templates/list.js I have:

venues: function() {
    return VenuesForUser.find();
},
xzz: function() {
    return Venues.find();
}

我的输出是:

Venue 1 - Venue 1 id
Venue 2 - Venue 2 id
...

在 javascript 控制台中，我得到:

And in the javascript console, I get:

Exception in template helper: .venues@http://localhost:3000/app/client/templates/list.js?2a82ae373ca11b4e9e171649f881c6ab1f8ed69b:11:7
bindDataContext/<@http://localhost:3000/packages/blaze.js?695c7798b7f4eebed3f8ce0cbb17c21748ff8ba8:2994:14
...

现在，我的问题是我的发布VenuesFoUser"在尝试访问其内容时产生了上述错误.

Now, my issue is that my publishing 'VenuesFoUser' generates the error above when trying to access its contents.

但是，为什么！?

如果我将VenuesForUser"的所有实例更改为VenuesAndUsers"，则订阅有效.但这有什么意义呢?我可以只为与集合匹配的订阅命名吗?

If I change all instances of 'VenuesForUser' to 'VenuesAndUsers' the subscription works. But how does that make sense? Can I only give names to subscriptions that match collections?

推荐答案

出版物将文档发布到您的收藏中.发布可以命名为 random，但如果它从名为 NotRandom 的集合返回一个游标，那么这就是它们在客户端上发布到的集合.

Publications publish documents to your collections. A publication can be named random, but if it returns a cursor from a collection named NotRandom, then that's the collection they get published to on the client.

您有一个名为 VenuesForUser 的发布，它从集合 VenuesAndUsers 返回一个游标.在客户端，VenuesAndUsers 是包含从服务器发布的数据的集合.所以你只能做 VenuesAndUsers.find()，因为没有名为 VenuesForUser 的集合.出版物名称对其他任何内容都没有影响 - 它只是一个名称.它不会为您创建新集合.

You have a publication named VenuesForUser, which returns a cursor from the collection VenuesAndUsers. On the client side, VenuesAndUsers is the collection that has the data that was published from the server. So you can only do VenuesAndUsers.find(), since there is no collection named VenuesForUser. The publication name has no effect on anything else - it's just a name. It doesn't create a new collection for you.

我希望我说清楚了.

这篇关于在 Meteor 中访问订阅的问题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！