create_booking.rb

class CreateBooking
  class LimitReached < RuntimeError; end
  class AlreadyBooked < RuntimeError; end

  include ActiveModel::Validations
  include ActiveModel::Conversion
  extend ActiveModel::Naming

  attr_reader :slot_id
  attr_reader :book_cart

  validate :check_bookings_limit
  validate :check_member_already_booked
  validate :check_cart_can_be_booked

  def initialize(params = {})
    @params = params
  end

  def member
    raise "Not implemented"
  end

  def slot
    @slot ||= Slot.find(params[:slot_id])
  end

  def available?
    bookings.count < slot.bookings_limit
  end

  def member_already_booked?
    member_booking.present?
  end

  def bookings
    slot.bookings
  end

  def member_booking
    bookings.where(member: member).first
  end

  def execute
    return false unless valid?

    Booking.create!(slot: slot, member: member)
  end
end

class CreateBookingWithMember < CreateBooking
  def initialize(member, params)
    super(params)
    @member = member
  end

  def member
    @member
  end
end

class CreateBookingWithPin < CreateBooking
  validates :pin, presence: true
  validate :check_member_exists

  def pin
    params[:pin]
  end

  def member
    @member ||= Member.where(pin: pin).first
  end

  private

  def check_member_exists
    unless member
      errors.add(:pin, 'Invalid PIN!')
    end
  end
end

class CreateBookingWithMemberId < CreateBooking
  validates :member_id, presence: true
  validate :check_member_exists

  def member_id
    params[:member_id]
  end

  def member
    @member ||= Member.where(id: member_id).first
  end

  private

  def check_member_exists
    unless member
      errors.add(:member_id, 'Invalid Member!')
    end
  end
end

gistfile1.txt

class Totem::BaseController < ApplicationController
  before_action :ensure_totem_mode_is_enabled!

  private

  def fetch_latest_posts
    @latest_posts = Post.by_date.published.limit(5)
  end

  def ensure_totem_mode_is_enabled!
    if params[:totem_mode] == ENV['PRESHARED_TOTEM_KEY']
      session[:totem_mode] = true
    end

    unless session[:totem_mode]
      redirect_to members_root_path, alert: I18n.t('flash.already_signed_in')
    end
  end
end