files_tree.rb

# Given a class with an array of files as paths e.g. 
# ['path/to/file.txt', 'other/file','path/file','file']
# Will organize them into a hash like
# {
#   'path' => {
#     'to' => {
#       'file' => {}
#     },
#     'file' => {}
#   },
#   'other' => {
#     'file' => {}
#   },
#   'file' => {}
# }

require 'active_support'
# ...
    def files_tree
      tree = {}
      files.each do |file|
        split_dirs = file.split(/\//)
        keyed_hash = {}
        split_dirs.reverse.each do |key|
          keyed_hash = {key => keyed_hash}
        end
        tree.deep_merge!(keyed_hash)
      end
      tree
    end