我有一个哈希数组来编写通用检查程序，因此我想传递要检查的键的名称。哈希是用带有符号(冒号前缀)的键定义的。我不知道如何正确使用变量作为键。即使键存在于哈希中，使用变量访问它也将导致nil。
在IRB中，我这样做:
>> family = { 'husband' => "Homer", 'wife' => "Marge" }
=> {"husband"=>"Homer", "wife"=>"Marge"}
>> somevar = "husband"
=> "husband"
>> family[somevar]
=> "Homer"
>> another_family = { :husband => "Fred", :wife => "Wilma" }
=> {:husband=>"Fred", :wife=>"Wilma"}
>> another_family[somevar]
=> nil
>>
如何通过变量访问哈希键？也许另一种询问方式是，如何将变量强制为符号？
最佳答案
您要先将字符串转换为符号:
another_family[somevar.to_sym]
如果您不必担心哈希是符号还是字符串，只需将其转换为符号键
请参阅:How do I convert a Ruby hash so that all of its keys are symbols?