Error raised : Arkency::CommandBus::UnregisteredHandler: Missing handler for Crm::RegisterCustomer

[Ariharan2002]

Im Newbie to CQRS approach, for learning purpose, i'm building CQRS based approach while building the same ecommerce application i faced the issue when creating customer 'Arkency::CommandBus::UnregisteredHandler: Missing handler for Crm::RegisterCustomer', i got like this but i have required each and every file that is necessary for the approach, please help me

[andrzejkrzywda]

We have this file https://github.com/RailsEventStore/ecommerce/blob/master/ecommerce/crm/lib/crm.rb which registers the command handler for a command. Is it missing in your code?

[Ariharan2002]

But i required that too, require "infra" require_relative "crm/commands/promote_customer_to_vip" require_relative "crm/commands/register_customer" require_relative "crm/commands/assign_customer_to_order"

require_relative "crm/events/customer_promoted_to_vip" require_relative "crm/events/customer_registered" require_relative "crm/events/customer_assigned_to_order.rb"

require_relative "crm/customer_service" require_relative "crm/customer" require_relative "crm/order_service" require_relative "crm/order"

module Crm class Configuration

def call(event_store, command_bus)
  command_bus.register(RegisterCustomer, OnRegistration.new(event_store))
end

end end Is there any requirement needed for command handler registration

[andrzejkrzywda]

Can you show the code where you call this Configuration class?

[Ariharan2002]

lib/configuration.rb

frozen_string_literal: true

require_relative '../../bloggie/configuration' require_relative '../../infra/lib/infra' require_relative '../app/read_models/Topics/register_topic'

require_relative '../app/read_models/Topics/update_topic'

class Configuration def call(event_store, command_bus) enable_res_infra_event_linking(event_store)

enable_topic_read_model(event_store)
Bloggie::Configuration.new.call(event_store, command_bus)

end

private

def enable_res_infra_event_linking(event_store) [ RailsEventStore::LinkByEventType.new, RailsEventStore::LinkByCorrelationId.new, RailsEventStore::LinkByCausationId.new ].each { |h| event_store.subscribe_to_all_events(h) } end

def enable_topic_read_model(event_store) Topics::Configuration.new.call(event_store) end end

bloggie/configuration.rb

frozen_string_literal: true

require_relative 'TopicSupport/lib/topic_support' require_relative '../rails_application/app/read_models/Topics/register_topic' require_relative '../rails_application/app/read_models/Topics/update_topic' module Bloggie class Configuration

def initialize
  super
end

def call(event_store, command_bus)
  configure_bounded_contexts
end

def configure_bounded_contexts
  event_store = Rails.configuration.event_store
  command_bus = Rails.configuration.command_bus

  [TopicSupport::Configuration.new].each { |c| c.call(event_store, command_bus) }
end

end end

i made some mistakes in call then i fixed now its working, Thank you @andrzejkrzywda

[andrzejkrzywda]

Cool, I'm glad it works now.

Feel free to ask in case of other questions.