gem "ginny"

bundle

gem install ginny

require "ginny"

data = {
  name: "Human",
  description: "This class models a person.",
  modules: ["MilkyWay", "Earth"],
  parent: "Mammal",
  default_constructor: true,
  attrs: [
    { name: "name", type: "String" },
    { name: "age",  type: "Integer" read_only: true, description: "Number of years the human has been alive." },
  ],
}

c = Ginny::Class.create(data)
c.render()   #=> Returns the generated code as a string.
c.generate() #=> Writes the generated code to a given folder, or the current directory if no argument is passed.

# human.rb
module MilkyWay
  module Earth
    # This class models a person.
    class Human < Mammal
      # @return [String]
      attr_accessor :name
      # Number of years the human has been alive.
      # @return [Integer]
      attr_reader :age

      # @param params [Hash]
      # @return [self]
      def self.create(params = {})
        h = Human.new
        h.name = params[:name]
        h.age = params[:age]
        return h
      end
    end
  end
end