dry_monads_with_handler

dry_monads_with_handler.rb

def result_handler(result)
  case result
  when Success, Some
    puts 'success, user created'
  when Failure { |message, _| message == :http_error }
    puts "HTTP request error, #{result.failure[2]}"
  when Failure { |message, _| message == :validation_error }
    puts "validation error, #{result.failure[2]}"
  when Failure(ROM::Error)
    puts 'User not created'
  end
end

def save_user_from_url(url, params)
  http.get(url, params)
    .bind { |body| validator.call(body).to_result }
    .bind { |payload| Try(ROM::Error) { (user_repository.create(payload) } }
    .fmap { |user| NotificationWorker.perform_async(user.id) }
end

result_handler save_user_from_url('site.com/posts/1', option: 1) # => HTTP request error
result_handler save_user_from_url('site.com/users/1', option: :invalid) # => validation Error
result_handler save_user_from_url('site.com/users/1', option: :dublicated) # => persistance Error
result_handler save_user_from_url('site.com/users/1', option: :valid) # => 'success, user created'