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Recursively Symbolize Keys Supports Hash And Array

04.21.2010

| 5996 views |

        Recursively Symbolize Keys supports Hash and Array

def symbolize_keys(obj)
  case obj
  when Array
    obj.inject([]){|res, val|
      res << case val
      when Hash, Array
        symbolize_keys(val)
      else
        val
      end
      res
    }
  when Hash
    obj.inject({}){|res, (key, val)|
      nkey = case key
      when String
        key.to_sym
      else
        key
      end
      nval = case val
      when Hash, Array
        symbolize_keys(val)
      else
        val
      end
      res[nkey] = nval
      res
    }
  else
    obj
  end
end

Tags:

Rails
Ruby

Comments

Alexey Tarasevich replied on Wed, 2010/01/06 - 7:52pm

Hi, kabaken! I think map here would be more appropriate:


def symbolize_keys arg
  case arg
  when Array
    arg.map { |elem| symbolize_keys elem }
  when Hash
    Hash[
      arg.map { |key, value|  
        k = key.is_a?(String) ? key.to_sym : key
        v = symbolize_keys value
        [k,v]
      }]
  else
    arg
  end
end