check.rb

#!/usr/bin/env ruby

require "bundler/inline"
require "json"

gemfile do
  source "https://rubygems.org"
  gem "rails_event_store", "2.9.1"
  gem "railties", "~> 7.0.0"
end

IssueHasBeenPostedOnGithub = 
  Class.new(RailsEventStore::Event)

module RubyEventStore
  class InMemoryRepository
    attr_reader :storage
  end
end

event = 
  IssueHasBeenPostedOnGithub.new(data: { payload: OpenStruct.new(message: "This is unpreserved OpenStruct.") })

in_memory_repository_with_json_serialization_to_mimic_database_behaviour = 
  RubyEventStore::InMemoryRepository.new(serializer: JSON)   

client = 
  RailsEventStore::JSONClient.new(repository: in_memory_repository_with_json_serialization_to_mimic_database_behaviour)

client.publish(event)

pp in_memory_repository_with_json_serialization_to_mimic_database_behaviour.storage
pp client.read.last