event.rb

class Event < ActiveRecord::Base
  enum format: [:standard, :draft, :cube, :pauper, :modern, :board_games, :commander, :free_for_all, :sealed_deck, :two_headed_giant]
  validates :title, presence: true
  validates :date, presence: true
  validates :format, presence: true
  validates :price, presence: true

  scope :weekly, -> { where(date: Date.today..6.days.from_now).order(date: :asc).limit(6) }
end

events_for_the_week.rb

class EventsForTheWeek

  def initialize(scope = Event.weekly)
    @scope = scope
  end

  def map(&blk)
    scope.map(&blk)
  end

  def each(&blk)
    scope.find_each(&blk)
  end

  private

  attr_reader :scope

end

send_weekly_events_for_telegram.rb

module Hobbyst
  module Biz
    class SendWeeklyEventsForTelegram

      def initialize(user_message, events = EventsForTheWeek.new, service = SendTelegramMessage)
        @user_message = user_message
        @events = events
        @service = service
      end

      def self.call(user_message)
        new(user_message).call
      end

      def call
        presenter = ViewWeeklyEventsForTelegramPresenter.new(events)
        service.call(
          chat_id,
          presenter.to_markdown
        )
      end

      private

      def chat_id
        user_message.chat.id
      end

      attr_reader :events, :service, :user_message

    end
  end
end