Implements more embed codes for events

- refactor video_type  collection to event model enumeration
#26

app/models/event.rb

@@ -3,6 +3,10 @@ class Event < ActiveRecord::Base
   has_paper_trail
   attr_accessible :title, :subtitle, :abstract, :description, :event_type_id, :people_attributes, :person, :proposal_additional_speakers, :track_id, :video_id, :video_type, :require_registration, :difficulty_level_id
 
+  VIDEO_TYPE = [YOUTUBE = 'YouTube', SLIDE_SHARE = 'SlideShare']
+
+  validates :video_type, inclusion: {in: VIDEO_TYPE}
+
   acts_as_commentable
 
   has_many :event_people, :dependent => :destroy