流星反应数据查询带有用户名和图片的注释 [英] Meteor Reactive Data Query for Comments with Usernames and Pictures

问题描述

我试图在一个大型应用程序中实现评论系统，并且始终遇到交叉反应和发布的问题.

I am trying to implement a commenting system in a huge app and always run in the problem about cross reactiveness and publications.

具体问题:

当用户发表评论时，我想显示该用户的姓名和个人资料图片.注释在一个集合中，名称和图片在另一个集合中.

When a user writes a comment, I want to show the user's name and a profile picture. The comments are in one collection, the names and pictures in another.

当我为该页面上的每个评论以及ID在服务器端此页面的评论中的每个用户进行订阅时，当添加新评论时，该应用程序不会更新客户端上可用的用户，因为"joins"在服务器上是非激活的.

When I make a subscription for every comment on this page and for every user whose id is in a comment of this page serversided, the app does not update the users available on the client when a new comment is added because "joins" are nonteactive on the server.

当我在客户端上执行此操作时，我必须一直取消订阅并重新订阅，添加了新评论，并且负担越来越重.

When I do that on the client, i have to unsubscribe and resubscribe all the time, a new comment is added and the load gets higher.

在流星中实施这种系统的最佳实践是什么?我该如何解决这个问题而又不会大量出版?

what is the best practise of implementing such a system in meteor? how can i get around that problem without a huge overpublishing?

推荐答案

由于尚未正式支持加入，因此社区中的所有解决方案都

As there is not official support for joins yet,among all the solutions out there in community

我找到了 https://github.com/englue/meteor-publish-composite该软件包非常有帮助，我正在我的应用程序中使用它.

I found https://github.com/englue/meteor-publish-composite this package very helpful and I'm using it in my app.

此示例非常适合您的要求

This example perfectly suits your requirement https://github.com/englue/meteor-publish-composite#example-1-a-publication-that-takes-no-arguments

Meteor.publishComposite('topTenPosts', {
    find: function() {
        // Find top ten highest scoring posts
        return Posts.find({}, { sort: { score: -1 }, limit: 10 });
    },
    children: [
        {
            find: function(post) {
                // Find post author. Even though we only want to return
                // one record here, we use "find" instead of "findOne"
                // since this function should return a cursor.
                return Meteor.users.find(
                    { _id: post.authorId },
                    { limit: 1, fields: { profile: 1 } });
            }
        },
        {
            find: function(post) {
                // Find top two comments on post
                return Comments.find(
                    { postId: post._id },
                    { sort: { score: -1 }, limit: 2 });
            },
            children: [
                {
                    find: function(comment, post) {
                        // Find user that authored comment.
                        return Meteor.users.find(
                            { _id: comment.authorId },
                            { limit: 1, fields: { profile: 1 } });
                    }
                }
            ]
        }
    ]
});

//客户端

Meteor.subscribe('topTenPosts');

最主要的是它是反应性

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