creating hash given a string and deeping them with deep_merge from active_support gem

test.rb

require 'active_support/all'

def single_hash(keys, value)
  splitted = keys.split(":")
  hash = { splitted.last => value }

  splitted[0..-2].reverse.each do |key|
    hash = { key => hash}
  end
  hash
end
arr = [
        ["a:b:c", 4],
        ["a:b:d", 5],
        ["a:x", 6]
      ]
h = {}

arr.each do |key, value|
  h.deep_merge!(single_hash(key, value))
end

p h