Ruby-on-rails 映射到散列的键
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Mapping to the Keys of a Hash
提问by Myxtic
I am working with a hash called my_hash:
我正在使用名为my_hash的哈希：
{"2011-02-01 00:00:00+00"=>816, "2011-01-01 00:00:00+00"=>58, "2011-03-01 00:00:00+00"=>241}
First, I try to parse all the keys, in my_hash(which are times).
首先，我尝试解析my_hash 中的所有键（这是时间）。
my_hash.keys.sort.each do |key|
parsed_keys << Date.parse(key).to_s
end
Which gives me this :
这给了我这个：
["2011-01-01", "2011-02-01", "2011-03-01"]
Then, I try to map parsed_keysback to the keys of my_hash:
于是，我尝试映射parsed_keys回的键my_hash：
Hash[my_hash.map {|k,v| [parsed_keys[k], v]}]
But that returns the following error :
但这会返回以下错误：
TypeError: can't convert String into Integer
How can I map parsed_keysback to the keys of my_hash?
我该如何映射parsed_keys回的键my_hash？
My aim is to get rid of the "00:00:00+00" at end of all the keys.
我的目标是摆脱所有键末尾的“00:00:00+00”。
回答by iblue
Why don't you just do this?
你为什么不这样做？
my_hash.map{|k,v| {k.gsub(" 00:00:00+00","") => v}}.reduce(:merge)
This gives you
这给你
{"2011-02-01"=>816, "2011-01-01"=>58, "2011-03-01"=>241}
回答by woto
There is a new "Rails way" methods for this task :)
此任务有一个新的“Rails 方式”方法:)
http://api.rubyonrails.org/classes/Hash.html#method-i-transform_keys
http://api.rubyonrails.org/classes/Hash.html#method-i-transform_keys
回答by Juan de Dios H.
Using iblueanswer, you could use a regexp to handle this situation, for example:
使用iblue答案，您可以使用正则表达式来处理这种情况，例如：
pattern = /00:00:00(\+00)+/
my_hash.map{|k,v| {k.gsub(pattern,"") => v}}.reduce(:merge)
You could improve the pattern to handle different situations.
您可以改进模式以处理不同的情况。
Hope it helps.
希望能帮助到你。
Edit:
编辑：
Sorry, ibluehave already posted the answer
抱歉，iblue已经发布了答案
