Ruby-on-rails 如何在rails中创建通知系统？
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How to create notification system in rails?
提问by cqcn1991
Basically, I want to create a notification like Facebook and Stackoverflow. Specifically, in a Post-Comments system, when a post get commented, everyone involved (people who creates the post and who create comments, except the new commenter) gets a notification message that this post get commented. And the notification get dismissed when people have read it.
基本上，我想创建一个像 Facebook 和 Stackoverflow 这样的通知。具体来说，在 Post-Comments 系统中，当一个帖子被评论时，所有参与的人（创建帖子和创建评论的人，除了新评论者）都会收到一条通知消息，表明该帖子被评论。当人们阅读它时，通知会被取消。
I have tried to use mailboxergem to implement it, but saddly there is no example available using its related methods, including social_streamitself.
我曾尝试使用邮箱gem 来实现它，但遗憾的是没有使用其相关方法的示例，包括social_stream本身。
Is there other way to create the Notification System?
还有其他方法可以创建通知系统吗？
And when I try to create it from scratch I get several problems:
当我尝试从头开始创建它时，我遇到了几个问题：
Model Notification
topic_id: integer
user_id: integer
checked: boolean #so we can tell whether the notification is read or not
- Dismissing the notication after being read by users
- 用户阅读后关闭通知
I think we just need to turn every notification messages' "checked" attribute to true after user visit the index of notification.(In the NotificationsController)
我认为我们只需要在用户访问通知索引后将每个通知消息的“已检查”属性设置为 true。（在 NotificationsController 中）
def index
@notifications=current_user.notication.all
@notification.each do |notification|
notification.checked = true
end
@notification.save!
end
2.Selecting users to notify(and exclude the user making new comment)
2.选择要通知的用户（排除新评论的用户）
I just have no idea in wrting queries....
我只是不知道在编写查询....
3.Creating notifications
3.创建通知
I think this should be something like
我认为这应该是这样的
#in CommentController
def create
#after creating comments, creat notifications
@users.each do |user|
Notification.create(topic_id:@topic, user_id: user.id)
end
end
But I think this is really ugly
但我觉得这真的很丑
There is no need to anwer the 3 problems above, Any simple solution to the Notification System is preferable , thanks....
以上3个问题无需回答，任何简单的通知系统解决方案都是可取的，谢谢....
采纳答案by Leonel Galán
I think you are on the right path.
我认为你走在正确的道路上。
A slightly better notifications#index
稍微好一点的通知#index
def index
@notifications = current_user.notications
@notifications.update_all checked: true
end
Notify this users
User.uniq.joins(:comments).where(comments: {id: @comment.post.comment_ids}).reject {|user| user == current_user }
通知此用户
User.uniq.joins(:comments).where(comments: {id: @comment.post.comment_ids}).reject {|user| user == current_user }
Unique users that participated in the @comment's post comments, reject (remove from result) current_user.
参与@comment 的帖子评论的唯一用户，拒绝（从结果中删除）current_user。
- An observer as pointed out by Jo?o Daniel, it is preferred over an after_create. This "Rails best practice" describes it pretty well: http://rails-bestpractices.com/posts/2010/07/24/use-observer
- Jo?o Daniel 指出的观察者，它比 after_create 更受欢迎。这个“Rails 最佳实践”很好地描述了它：http: //rails-bestpractices.com/posts/2010/07/24/use-observer
回答by Remon Amin
there is an amazing gem called public activity ,,you can customize it as you want and here is a screencast about it in railscast http://railscasts.com/episodes/406-public-activityhope that could help you.
有一个很棒的宝石叫做公共活动，你可以根据需要自定义它，这里是 railscast http://railscasts.com/episodes/406-public-activity 中关于它的截屏视频， 希望可以帮助你。
Update
更新
In my rails application I made a similar notifications system like yours to send notifications to all users but in index action you can user
在我的 rails 应用程序中，我制作了一个类似的通知系统来向所有用户发送通知，但在索引操作中，您可以使用
current_user.notifications.update_all(:checked=>true)
and also to send only one notifications to the user once not several times that somebody commented on the post you can use unique_by method
并且只向用户发送一次通知，而不是多次有人对帖子发表评论，您可以使用 unique_by 方法
@comments [email protected]_by {|a| a[:user_id]}
then you can send notifications to only users of previous comments
然后您可以仅向以前评论的用户发送通知
@comments.each do |comment|
comment.user.notifications.create!(....
end
hope that could help you
希望能帮到你
