Hash#to_struct

hash#to_struct.rb

autoload :OpenStruct, 'ostruct'

class Hash
  def to_struct struct_name
    Object.const_set(struct_name, Struct.new(*keys)).new(*values)
  end
  
  def to_ostruct
    OpenStruct.new self
  end
end

menu = { breakfast: 'Green Eggs & Ham',
             lunch: 'Bagel',
            dinner: 'Ice Cream' }

menu = menu.to_struct :Meal
#=> #<struct Meal breakfast="Green Eggs & Ham", lunch="Bagel", dinner="Ice Cream">

menu.breakfast
#=> "Green Eggs & Ham"