2012-11-30 144 views
1

我有一个数组:排序多维阵列中的Ruby

[26] pry(#<HomeController>)> repos.class 
=> Array 
[27] pry(#<HomeController>)> repos.size 
=> 2319 
[28] pry(#<HomeController>)> 
监视列表的

,其元素组成的不同的类型:

[29] pry(#<HomeController>)> repos[0] 
=> #<Watchlist _id: 4f82c1127c0c220001000002, _type: nil, searchable_values: ["description:grit", "description:gives", "description:you", "description:object", "description:oriented", "description:read", "description:write", "description:access", "description:to", "description:git", "description:repositories", "description:via", "description:ruby", "tag:git", "html_url:https", "html_url:github", "html_url:com", "html_url:mojombo", "html_url:grit"], arrangeable_values: {"description"=>"Grit gives you object oriented read/write access to Git repositories via Ruby.", "tag"=>"git", "html_url"=>"https://github.com/mojombo/grit"}, html_url: "https://github.com/mojombo/grit", description: "Grit gives you object oriented read/write access to Git repositories via Ruby.", forks: 269, watchers: 1536, created_at: 2007-10-29 14:37:16 UTC, pushed_at: 2012-09-04 21:54:09 UTC, avatar_url: "https://secure.gravatar.com/avatar/25c7c18223fb42a4c6ae1c8db6f50f9b?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-user-420.png", tags_array: ["git"], fork_: "false"> 

[30] pry(#<HomeController>)> repos[1] 
=> #<Watchlist _id: 4f82c1127c0c220001000003, _type: nil, searchable_values: ["description:ruby", "description:process", "description:monitor", "html_url:https", "html_url:github", "html_url:com", "html_url:mojombo", "html_url:god"], arrangeable_values: {"description"=>"Ruby process monitor", "tag"=>"", "html_url"=>"https://github.com/mojombo/god"}, html_url: "https://github.com/mojombo/god", description: "Ruby process monitor", forks: 218, watchers: 1181, created_at: 2008-01-13 05:16:23 UTC, pushed_at: 2012-10-02 23:15:44 UTC, avatar_url: "https://secure.gravatar.com/avatar/25c7c18223fb42a4c6ae1c8db6f50f9b?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-user-420.png", tags_array: [], fork_: "false"> 

我怎样才能排序监视列表使用监视列表字段元素命名观察者

[31] pry(#<HomeController>)> repos[0].watchers 
=> 1536 
[29] pry(#<HomeController>)> repos[1].watchers 
=> 1181 
[32] pry(#<HomeController>)> 

回答

2
repos.sort_by(&:watchers) 

即返回排序后的数组。要对其进行排序,请改用sort_by!

如果它可能是一个因素可能没有watchers方法,你可以试试这个:如果他们不是所有整数

repos.sort_by { |e| e.watchers rescue 0 } 

,你可以将它们转换:

repos.sort_by { |e| e.watchers.to_i } 
+0

这就是我所做的,但我回到这里:[31] pry(#)> repos.sort {| a,b | a.watchers <=> b.watchers} 参数错误:自监视列表的监视列表比较失败 源于/var/www/gitwatcher/vendor/bundle/ruby/1.9.1/bundler/gems/mongoid-be43b096e0a7/lib/mongoid/relations/ proxy.rb:117:'sort' [32] pry(#)> –

+1

所有的元素都有'watchers'吗?它真的是一个整数,还是它看起来像一个? –

+0

所有元素都有观察者,但他们不是“干净”的数据类型,有时他们是整数,有时他们是字符串... –

1

它看起来像你想Array#sortby

repos.sort_by{|elem| elem.watchers } 

它会排序数组由“观察者”字段的值。

+0

我得到“ArgumentError:比较带有461的字符串失败“,因为一些”elem.watchers“的类型是”int“,而另一些是”字符串“。我怎样才能把它全部转换成整数? –

+0

看到我的答案,卢卡。 –