def determine_layout
    action = params[:action]
    %w(index show edit update).include?(action) ? "application" : "sessions"  
...

def determine_layout
    action = params[:action]
    if action == "index" || action == "show" || action == "edit" || action == "update"
...

module DashboardHelper
  def activity_message_for(object)
    case object.class.name
...