fluke/devops-service/lib/stack_presets/factory.rb

require_relative 'base'
require_relative 'postgres_cluster'
require_relative 'preset_not_found'

class Devops::StackPresetsFactory

  # find all classes in Devops::StackPresets modules excluding Base and factory.
  # This list can be extended in external gems via defining new classes in Devops::StackPresets module.
  def self.list
    @list ||= Devops::StackPresets.constants.select do |class_name|
      class_name != :Base
    end.map do |class_name|
      Devops::StackPresets.const_get(class_name).new
    end
  end

  def self.get(id)
    preset = list.detect { |preset| preset.id == id }
    raise PresetNotFound, "Preset '#{preset}' not found" unless preset
    preset
  end

end