Generate nested hashes from strings and deep merging in ruby

Question

I have a hash in the database in JSON format. eg

{
  \"one\" => {
    \"two\" => {
      \"three\" => {}
    }
  } 
}

I need to ge

Answer 1

To generate nested hash:

hash = {}

"one.two.three".split('.').reduce(hash) { |h,m| h[m] = {} }

puts hash #=> {"one"=>{"two"=>{"three"=>{}}}}

If you don't have rails installed then install activesupport gem:

gem install activesupport

Then include it into your file:

require 'active_support/core_ext/hash/deep_merge'

hash = {
  "one" => {
    "two" => {
      "three" => {}
    }
  } 
}.deep_merge(another_hash)

The access to the internals would be:

hash['one']['two']['three'] #=> {}