Question

我正在尝试使用公共密钥加入ruby中的多个哈希数组。例如：

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}
]

这类似于Javascript中protovis的pv.nest功能。请参阅：http://protovis-js.googlecode.com/svn/trunk/jsdoc/symbols/pv.Nest.html

我怎么能在Ruby中做到这一点？

Answer 1

如果将所有不同的哈希值放入一个数组中，则可以使用group_by将具有相同country_id的哈希值组合在一起。然后，您可以inject与merge merge一起使用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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在Ruby中加入哈希数组

1 个答案: