Converting a nested hash into a flat hashThis question is the inverse of this question. Given a nested hash like { :a => { :b => {:c => 1, :d => 2}, :e => 3, }, :f => 4, } what is the best way to convert it into a flat hash like { [:a, :b, :c] => 1, [:a, :b, :d] => 2, [:a, :e] => 3, [:f] => 4, }
