Traversing through nested hash in ruby and delete hashes that contain empty nodes

I am trying to figure out a way to clean up a hash result in ruby. What I mean by clean is that I have a hash that contains hashes that are empty at different nested levels. Programmatically, how would I do this in ruby? I'm new to ruby here and this is what I have so far, and I'm stuck. Thank you in advance.

@main_hash.each |key, value| do
    if(value.class == Hash && !value.empty?) do
       # loop in further to delete 
    elsif(value.class == Hash && value.empty?)
        # delete this value
    end
end

UPDATE: I think I'll have to go with a recursive method to do this. But my trouble is, how can I delete the actual value hash from the correct level of the main hash when the empty value hash is found.

    def compactify_hash(main_hash)
    main_hash.each |key, value| do
        if(value.class == Hash && !value.empty?) do
            compactify_hash(value)
        elsif(value.class == Hash && value.empty?)
            # how to delete this hash?
        end

    end
end