MeteorJS + Iron-Router:如何使用pathFor调用集合中的下一个项目?

问题描述：

在发布此问题之前，我做了很多研究，但找不到答案.我敢肯定这是一个简单的任务，但是由于某种原因，它使我头疼.

I did a lot of research before posting this question and couldn't find the answer. I'm sure it's a simple task, but it's going over my head for some reason.

我有一个帖子"类型页面，其中列出了我的收藏中的所有项目，还有一个单个帖子"页面，用于显示所选帖子的内容.我有两个分页箭头可以转到上一个项目和下一个项目.如何获取上一个/下一个帖子的URL并将其显示在我的模板中?

I have a "posts" type page that lists all items in my collection, and a "single post" page to display the contents of the selected post. I have two pagination arrows for going to the previous item and next item. How can I grab the URL for the previous/next posts and display it in my template?

任何帮助将不胜感激，谢谢！

Any help would be appreciated, thanks!

答

我创建了示例应用程序，该应用程序完全可以满足您的需求. 请检查它: https://github.com/parhelium/meteor -so-post-next-prev/tree/master

I created sample application which exactly do what you need. Please check it : https://github.com/parhelium/meteor-so-post-next-prev/tree/master

简要说明此代码的重要部分(请参见 repo 查找更多详细信息):

Briefly explanation of important parts of this code ( see repo to find more details ):

首先，您需要一些模型:

First you need to have some model:

 {title:"1 post", createdAt:moment("01-10-1995", "DD-MM-YYYY").toDate()}

并发布功能:

Meteor.publish("postDetailsNext",function(postId){ });
Meteor.publish("postDetailsPrev",function(postId){ });
Meteor.publish("postDetails",function(postId){});

棘手"部分是如何编写查询以获取next和prev帖子的信息.

The 'tricky' part is how to write queries for taking next and prev posts.

Meteor.publish("postDetailsNext",function(postId){

      // load post object which should be displayed in 'postDetails' route
      var post = Posts.findOne({_id:postId});

      // find one post from sorted cursor which is older than main post 
      return Posts.find({createdAt:{$gt:post.createdAt}},{sort:{createdAt:1}, limit:1})
});

以及类似的内容:

Meteor.publish("postDetailsPrev",function(postId){  
      var post = Posts.findOne({_id:postId});
      return  Posts.find({createdAt:{$lt:post.createdAt}},{sort:{createdAt:-1}, limit:1})
  });

请注意，来自以上发布功能的查询在sort field中有所不同.

Note that queries from above publish functions differs in sort field.

this.route('postDetails',{
      where:'client',
      path:'/post/:_postId',
      template:'postDetails',
      waitOn:function(){
        return [
            Meteor.subscribe('postDetails', this.params._postId),
            Meteor.subscribe('postDetailsPrev', this.params._postId),
            Meteor.subscribe('postDetailsNext', this.params._postId)
        ]
      },
      data:function(){
        var post = Posts.findOne({_id:this.params._postId});
        if(post == null) return {};
        else
            return {
                post : Posts.findOne({_id:post._id}, {limit:1}),
                prev : Posts.findOne({createdAt:{$lt:post.createdAt}},{sort:{createdAt:-1}}),
                next : Posts.findOne({createdAt:{$gt:post.createdAt}},{sort:{createdAt:1}})
            }
        }
      }
    })

MeteorJS + Iron-Router:如何使用pathFor调用集合中的下一个项目?

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