osem-fcy/app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  include ApplicationHelper
  protect_from_forgery

  def verify_user
    :authenticate_user!

    if (current_user.nil?)
      redirect_to '/accounts/sign_in'
      return false
    end

    @conference = Conference.find_all_by_short_title(params[:conference_id]).first
    true
  end

  def organizer_or_admin?
    has_role?(current_user, 'admin') || has_role?(current_user, 'organizer')
  end

  def verify_organizer
    if !verify_user
      return
    end

    ## Todo simplify this
    redirect_to '/' unless has_role?(current_user, 'admin') || has_role?(current_user, 'organizer')
  end

  def verify_admin
    if !verify_user
      return
    end

    redirect_to '/' unless has_role?(current_user, 'admin')
  end

  def current_ability
    @current_ability ||= AdminAbility.new(current_user)
  end

  rescue_from CanCan::AccessDenied do |exception|
    Rails.logger.debug("Access denied!")
    redirect_to '/', :alert => exception.message
  end
end