How can I get the keys in a multidimensional hash in Ruby?

Question

So with a normal hash you can use this to get the keys:

hash.keys

How can I get the keys of the 2nd dimension of a multidimensional hash that looks like this:

{"<id>"=>{"first_name"=>"test", "last_name"=>"test_l", "username"=>"test_user", 
"title"=>"Sales Manager", "office"=>"test", "email"=>"[email protected]"}}

<id> is unique for each item.

So the keys I want from above are: first_name, last_name, username, title, office and email

Answer 1

You would do something like:

hash["<id>"].keys