Convert nested hashes to nested structs

hash-to-struct.rb

  def hash_to_struct(hash)
    return hash if hash.keys.
    select { |k| !k.is_a?(Symbol) }.size > 0
    struct = Struct.new(
    *hash.keys).new(*hash.values)
    hash.each do |key, value|
      if value.is_a?(Hash)
        struct[key] =
        self.hash_to_struct(value)
      end
    end
    struct
  end

Recursively converts a hash to a struct. Stops whenever it encounters anything other than a hash, or a hash that does not have symbols as keys, e.g.:

  hash =  { know_that: { "this" => "won't be converted" }, see_if: { this: { will: "be converted" } }
  struct = hash_to_struct(hash)
  struct.know_that # => { "this" => "won't be converted" }
  struct.see_if.this.will # => "be converted"

This achieves 20x better performance than using nested hashes!