example.rb

class SomeController
  def create
    @objective = CreateObjective.call(
      tenant: Apartment::Tenant.current,
      params: params
    ).objective
  end
end

module CreateObjective
  def call
    if context.tenant == 'vtl'
      CreateObjective::VTL.call(context)
    else
      CreateObjective::Common.call(context)
    end
  end

  class Common
    def call
      ActiveRecord::Base.transaction do
        context.objective = Objective.create(params)
        inside_transaction(context)
      end
    end

    def inside_transaction(context)
    end
  end

  class VTL < Common
    def call
      super
      Notification.create(employee: context.employee, message: 'Objective created')
    end

    def self.inside_transaction(context)
      update_objectives_counter(context.employee)
    end

    private

    def self.update_objectives_counter(employee)
      employee.update(objective_count: employee.objectives.count)
    end
  end
end