显示某人是否正在阅读信息 [英] Showing if someone is reading a post

问题描述

我想显示正在阅读信息的人员列表。
在尝试实现该函数之前，我想问一些建议。我将首先检查在 PostsController 中调用 show 操作的用户;每次一个人查看帖子时，他将被记录在正在阅读帖子的人的列表中。不过，我不知道在离开时，如何从列表中删除此人。是否有方法使用 cookies 或 sessions 通知用户是否离开某个页面？有一点帮助可以帮助我马上开始！

I want to show the list of people who are reading a post. Before attempting to implement the function, I wanted to ask for some advice. I would start by checking users who invoke the show action in the PostsController; every time a person views a post, he will be recorded onto the list of people who are reading the post. However, I am not sure how to remove the person from the list when he navigates away from reading the post. Is there a way to use cookies or sessions to notice if the user navigates away from a certain page? A little bit of help would help me get started right away!

我很感激任何建议。谢谢！

I appreciate any advice. Thank you!

推荐答案

更准确

rb

post "/posts/:id/being_read" => "posts#being_read", :defaults => { :format => "json"}

在控制器中

PostsController < ApplicationController
  def being_read
    current_user && @post.being_read_by current_user
    head :ok
  end
end

显示页面

function beingRead(){
  $.post("/posts/<%=@post.id%>/being_read", function(data) {
    setTimeout(beingRead,10000);
  });
}

in post.rb

in post.rb

def being_read_by user=nil
  # making use of rails low level cache

  readers_ids = Rails.cache.fetch("Post #{id} being read", :expires_in => 5.minutes) || []

  readers_ids = Rails.cache.fetch("Post #{id} being read", :expires_in => 5.minutes) (readers_ids << user.id) if user

  readers_ids
end

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