lpr-partynest/app/models/telegram_bot.rb

# frozen_string_literal: true

class TelegramBot < ApplicationRecord
  USERNAME_RE = /\A[a-z_][a-z0-9_]*\z/i.freeze

  validates :secret, presence: true
  validates :api_token, presence: true

  validates :username,
            allow_nil: true,
            presence:  true,
            format:    USERNAME_RE

  def client
    @client ||= api_token.try do |api_token|
      Telegram::Bot::Client.new api_token
    end
  end
end