Cleaner controller with service object

cleaner_controller.rb

# A controller

module Api::V2
  module Controllers::ZonesRecords
    class Create
      include Hanami::Action

      def call(params)
        @zone = DomainFinder.find!(
          params[:zone_id], authentication_context).zone
        @result = RecordCreateCommand.execute(command_context, @zone,
          params[:type], ZoneRecordParams.new(params, [:regions]))
        @record = @result.data

        if @result.successful? && !@result.exists
          render Serializers::RecordSerializer.new(@record), 201
        elsif @result.exists
          error(400, I18n.t("api.zone_records.already_exists"))
        else
          render Serializers::ErrorSerializer.new(@result.error, @record), 400
        end
      end
    end
  end
end

# A cleaner controller

module Api::V2
  module Controllers::ZonesRecords
    class Create
      include Hanami::Action

      def call(params)
        zone_record_creator = ZoneRecordCreator.new(params)
        zone_record_creator.create_zone_record
        
        if zone_record_creator.zone_record_created_successfully?
          render Serializers::RecordSerializer.new(zone_record_creator.zone_record), 201
        elsif zone_record_creator.zone_record_already_exists?
          error 400, I18n.t("api.zone_records.already_exists")
        else
          render Serializers::ErrorSerializer.new(zone_record_creator.error, zone_record_creator.zone_record), 400
        end
      end
    end
  end
end

# Service

class ZoneRecordCreator
  attr_reader :params
  attr_reader :zone_record, :errors
  
  def initialize(params)
    @params = params
  end
  
  def create_zone_record
    validate_params
    
    if params_valid?
      find_domain_zone
      create_the_record
    end
  end
  
  def zone_record_created_successfully?
    # ...
  end
  
  def zone_record_already_exists?
    # ...
  end
  
  private
  
  attr_reader :domain_zone
  
  def validate_params
    # ...
  end
  
  def params_valid?
    # ...
  end
  
  def find_domain_zone
    domain_zone_finder = DomainZoneFinder.new
    domain_zone_finder.find_domain_zone
    
    @domain_zone = domain_zone_finder.domain_zone
  end
  
  def create_the_record
    # ...
  end
end