class Person
   include Mongoid::Document
   field :email, type: String
   field :month, type: Date
   field :monthly_total, type: Hash, default:  {:email_open => 0, :email_click => 0, :page_view => 0}

   has_many :monthly_events
 end

 class MonthlyEvent
   include Mongoid::Document
   field :name, type: String
   belongs_to :person
   embeds_many :daily_events   # this would only contain until 31 documents
 end

 class DailyEvents
   include Mongoid::Document
   field :day
   field :email_open, type: Integer
   field :email_click, type: Integer
   field :page_view, type: Integer
   embedded_in :monthly_event
 end