How to move attributes in Ruby hash "up" one level

Question

x = {:name => "John", :data => {:physical => {:age => 25, :weight => 150}}}

I'm looking to move the subattributes of data up one level (but not necessarily simply flatten all attributes). In this case, I essentially want to move the :physical attribute "up" one level.

I'm trying this

y = x[:data']
y.each{ |key| x[key] = y[key] }

but I get ...

x = x.except(:data)
 => {:name=>"John", [:physical, {:age=>25, :weight=>150}]=>nil} 

I'm looking for ...

 => {:name=>"John", :physical => {:age=>25, :weight=>150}} 

Answer 1

Try this:

x = x.merge(x.delete(:data))

Answer 2

I'd go after it this way:

x = {:name => "John", :data => {:physical => {:age => 25, :weight => 150}}}

x[:physical] = x.delete(:data)[:physical]

pp x #=> {:name=>"John", :physical=>{:age=>25, :weight=>150}}