has_json_snapshot.rb

has_json_snapshot.rb

module HasJsonSnapshot
  extend ActiveSupport::Concern

  class_methods do
    def has_one_json_snapshot(attribute_name, class_name: attribute_name.to_s.classify)
      klass = class_name.constantize
      raise "#{class_name} does not have #as_json method" unless klass.method_defined?(:as_json)

      composed_of(
        attribute_name,
        constructor: ->(json) { klass.new(json) },
        converter: ->(model) { model.as_json.except(:id, :created_at, :updated_at) }
      )
    end

    def has_many_json_snapshots(attribute_name, class_name: attribute_name.to_s.classify)
      klass = class_name.constantize
      raise "#{class_name} does not have #as_json method" unless klass.method_defined?(:as_json)

      composed_of(
        attribute_name,
        constructor: ->(json) { json.map { klass.new(_1) } },
        converter: ->(models) { models.map { _1.as_json.except(:id, :created_at, :updated_at) } }
      )
    end
  end
end