rails 按标题对博客文章进行排序 [英] rails sorting blog posts by title

问题描述

我意识到这可能很少发生(两个或多个用户具有相同的博客文章标题)，但这是我的客户想要的，所以我必须弄清楚.

I realize that this could be a rare occurrence (that two or more users would have the same blog post title) but this is something my client wants so, I have to figure it out.

我有一个查询@blog_posts(这是对根据位置等更改的帖子的查询).我需要一种方法来列出所有帖子标题以及该标题在查询 @blog_posts

I have a query @blog_posts (which is a query on Posts that changes based on location, etc). I need a way to to list out all the posts titles and how many times that title occurs within the query @blog_posts

像这样:

How to clean a car (2)
I love baseball (1)

是否有分组和排序的标准做法?

Is there a standard practice for grouping and sorting?

总而言之，我需要计算查询中出现的次数 @blog_posts = Post.where(...) (例如)——不是现有的所有帖子.

推荐答案

听起来您基本上想要计算出现次数:这个答案 可以适应您的目的.

Sounds like you basically want to count occurrences: this answer could be adapted to your purposes.

如果您使用的是 1.8.7 或更高版本，请考虑使用 group_by:

If you're on 1.8.7 or newer, consider group_by:

ruby-1.9.2-p180 :002 > posts = ["How to clean a car", "How to clean a car", "I love baseball"]
 => ["How to clean a car", "How to clean a car", "I love baseball"]
ruby-1.9.2-p180 :007 > posts.group_by {|e| e}.map {|k, v| {k => v.length}}
 => [{"How to clean a car"=>2}, {"I love baseball"=>1}] 

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