dry-Struct

spec.rb

require "bundler/inline"

gemfile(false) do
  source "https://rubygems.org"
  gem "dry-struct", '0.5'
  gem "dry-types", '0.14'
  gem 'rails_event_store-rspec', '1.0.0'
  gem "pry-byebug"
  gem 'activesupport'
end

require 'rspec/autorun'
require 'active_support/core_ext/object/try'

module Types
  include Dry::Types.module
end

class Event < Dry::Struct
  def data
    to_h
  end

  def metadata
    {}
  end
end

class Address < Dry::Struct
  attribute :name, Types::String.meta(omittable: true)
end
class MyEvent < Event
  attribute :address, Address.meta(omittable: true)
end

RSpec.describe MyEvent do
  it 'works' do
    event = described_class.new(address: { name: 'foo' })
    expect(event)
      .to(be_an_event(described_class)
      .with_data(address: { name: 'foo' }))
  end
end