加入哈希的阵列中的Ruby [英] Joining arrays of hashes in Ruby
本文介绍了加入哈希的阵列中的Ruby的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想加入使用公共密钥的红宝石哈希的多个阵列。例如:
I am trying to join multiple arrays of hashes in ruby using a common key. For example:
country_info = [
{country_id: "US", country_desc: "United States"},
{country_id: "AU", country_desc: "Australia"}
]
country_stats = [
{country_id:"US", pageviews: 150},
{country_id:"AU", pageviews: 200}
]
i_want = [
{country_id: "US", country_desc: "United States", pageviews:150},
{country_id: "AU", country_desc: "Australia", pageviews:200}
]
这是一样的东西在Javascript protovis的pv.nest功能。请参阅:的http:// protovis-JS 。谷歌code.com / SVN /主干/ jsdoc /符号/ pv.Nest.html
This is something like the pv.nest function of protovis in Javascript. See: http://protovis-js.googlecode.com/svn/trunk/jsdoc/symbols/pv.Nest.html
我怎么能做到这一点的红宝石?
how can I do this in Ruby?
推荐答案
如果你把所有的不同的散列成一个阵列,可以使用 GROUP_BY
同组的那些同样 COUNTRY_ID
。然后,您可以使用注
与合并
到合并
那些一起
If you put all the different hashes into one array, you can use group_by
to group together those with the same country_id
. You can then use inject
with merge
to merge
those together:
country_info_and_stats = country_info + country_stats
country_info_and_stats.group_by {|x| x[:country_id]}.map do |k,v|
v.inject(:merge)
end
#=> [{:country_id=>"US", :country_desc=>"United States", :pageviews=>150},
# {:country_id=>"AU", :country_desc=>"Australia", :pageviews=>200}]
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