哈希['关键']用Ruby hash.key [英] hash['key'] to hash.key in Ruby

问题描述

我有一个哈希

 富= {'酒吧'=＆GT;'巴兹'}
 

我想调用 foo.bar＃=＆GT; 巴兹

我的动机是重写一个ActiveRecord查询到原始SQL查询（使用型号的find_by_sql）。此方法返回的SELECT子句值作为密钥的哈希值。但是，我现有的code依赖的object.method点符号。我想要做的最小的code重写。谢谢你。

编辑：看来lua有这样的特征：

 点= {X = 10，Y = 20}  - 创建新表
打印（点[X]） - 打印10
打印（point.x） - 具有完全相同的上述含义线
 

解决方案

 ＆GT;＆GT;需要'ostruct
=＆GT; []
＆GT;＆GT;富= {'酒吧'=＆GT;'巴兹'}
=＆GT; {栏=＆gt;中巴兹}
＆GT;＆GT; foo_obj = OpenStruct.new FOO
=＆GT; ＃＆LT; OpenStruct栏=巴兹＆GT;
＆GT;＆GT; foo_obj.bar
=＆GT; 巴兹
＆GT;＆GT;
 

I have a a hash

foo = {'bar'=>'baz'}

I would like to call foo.bar #=> 'baz'

My motivation is rewriting an activerecord query into a raw sql query (using Model#find_by_sql). This returns a hash with the SELECT clause values as keys. However, my existing code relies on object.method dot notation. I'd like to do minimal code rewrite. Thanks.

Edit: it appears Lua has this feature:

point = { x = 10, y = 20 }   -- Create new table
print(point["x"])            -- Prints 10
print(point.x)               -- Has exactly the same meaning as line above

解决方案

>> require 'ostruct'
=> []
>> foo = {'bar'=>'baz'}
=> {"bar"=>"baz"}
>> foo_obj = OpenStruct.new foo
=> #<OpenStruct bar="baz">
>> foo_obj.bar
=> "baz"
>>

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