Ruby哈希差异在1.8.7和1.9.2

def to_params(_hash)
  params = ''
  stack = []

  _hash.each do |k,v|
    if v.is_a?(Hash)
      stack << [k,v]
    else
      #v = v.first if v.is_a?(Array)
      params << "#{k}=#{v}&"
    end
  end

  stack.each do |parent,hash|
    hash.each do |k,v|
      if v.is_a?(Hash)
        stack << ["#{parent}[#{k}]",v]
      else
        params << "#{parent}[#{k}]=#{v}&"
      end
    end
  end

  params.chop! # trailing &
  params
end

q = {"some_key"=>["some_val"],"another_key"=>["another_val"]}
n = convert_params(q)

puts n

> Ruby 1.8.7输出：

some_key = some_val&安培; another_key = another_val

> Ruby 1.9.2输出：

some_key = [ “some_val”]&安培; another_key = [ “another_val”]

1.9.2保留值的“数组”类型,而1.8.7隐式地将类型更改为字符串.