merge some complex hashes in ruby

I'd like to merge the following hashes together. ``` h1 = {"201201" => {:received => 2}, "201202" => {:received => 4 }} h2 = {"201201" => {:closed => 1}, "201202" => {:closed => 1 }} ``` particularly, my expected result is: ``` h1 = {"201201" => {:received => 2, :closed => 1}, "201202" => {:received => 4, :closed => 1 }} ``` I have tried every way as: ``` h = h1.merge(h2){|key, first, second| {first , second} } ``` unfortunately, neither seemed to work out fine for me. any advice would be really appreciated.