Ruby 1.8.7 将哈希转换为字符串
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Ruby 1.8.7 convert hash to string
提问by megas
I wasn't working with ruby 1.8.7 and recently I was surprised that:
我没有使用 ruby 1.8.7，最近我很惊讶：
{:k => 30}.to_s #=> "k30"
Is there ready to use fix to convert hash to string for ruby 1.8.7 to make it look like:
是否准备好使用修复程序将 ruby 1.8.7 的哈希转换为字符串，使其看起来像：
{:k => 30}.to_s #=> "{:k=>30}"
回答by Prakash Murthy
hash.to_shas indeed been changed from 1.8.7to 1.9.3.
hash.to_s确实已从 更改1.8.7为1.9.3。
In 1.8.7, (ref: http://ruby-doc.org/core-1.8.7/Hash.html#method-i-to_s):
在1.8.7，（参考：http: //ruby-doc.org/core-1.8.7/Hash.html#method-i-to_s）：
Converts hsh to a string by converting the hash to an array of [ key, value ] pairs and then converting that array to a string using Array#join with the default separator.
通过将哈希转换为 [ key, value ] 对数组，然后使用 Array#join 将该数组转换为字符串并使用默认分隔符，将 hsh 转换为字符串。
In 1.9.3, (ref: http://www.ruby-doc.org/core-1.9.3/Hash.html#method-i-to_s)
在1.9.3，（参考：http: //www.ruby-doc.org/core-1.9.3/Hash.html#method-i-to_s）
Alias for : inspect
别名：检查
You could monkey-patch Hash class in 1.8.7 to do the same locally with the following:
您可以在 1.8.7 中对 Hash 类进行猴子补丁，以在本地执行以下操作：
class Hash
alias :to_s :inspect
end
Before monkey-patching:
在猴子补丁之前：
1.8.7 :001 > {:k => 30}.to_s
=> "k30"
1.8.7 :002 > {:k => 30}.inspect
=> "{:k=>30}"
Monkey-patching & after:
猴子修补及之后：
1.8.7 :003 > class Hash; alias :to_s :inspect; end
=> nil
1.8.7 :004 > {:k => 30}.to_s
=> "{:k=>30}"
