gistfile1.rb

  def rename_keys(obj)
    if obj.is_a? Hash
      Hash[rename_hash_keys(obj)]
    elsif obj.is_a? Array
      obj.map {|o| rename_keys(o)}
    end
  end

  def rename_hash_keys(hash)
    p hash
    Hash[hash.map {|k,v|
      [k.camelize(:lower), handle_value(v)]
    }]
  end

  def handle_value(value)
    if value.class == Hash
      rename_hash_keys(value)
    elsif value.class == Array
      rename_keys(value)
    else
      value
    end
  end

gistfile2.txt

Sample input:

{"some_key"=>[{"key_a"=>1, "key_b"=>2}]}


Sample output:

{"someKey"=>[{"keyA"=>1, "keyB"=>2}]}



Sample input:

["asdf_asdf"]

Sample output: 

["asdf_asdf"]