star voting system for proposals

app/models/event.rb

@@ -9,8 +9,10 @@ class Event < ActiveRecord::Base
   has_many :event_attachments, :dependent => :destroy
   has_many :people, :through => :event_people
   has_many :speakers, :through => :event_people, :source => :person, :conditions => {"event_people.event_role" => "speaker"}
+  has_many :votes
+  has_many :voters, :through => :votes, :source => :person
   belongs_to :event_type
-  
+
   has_and_belongs_to_many :registrations
 
   belongs_to :track
@@ -62,6 +64,19 @@ class Event < ActiveRecord::Base
     end
   end
 
+  def voted?(event, person)
+    event.votes.where("person_id = ?", person).first
+  end
+  
+  def average_rating
+    @total_rating = 0
+    self.votes.each do |vote|
+      @total_rating = @total_rating + vote.rating
+    end
+    @total = self.votes.size
+    number_with_precision(@total_rating / @total.to_f, :precision => 2, :strip_insignificant_zeros => true)
+  end
+
   def submitter
     result = self.event_people.where(:event_role => "submitter").first
     if !result.nil?

app/models/person.rb

@@ -8,6 +8,8 @@ class Person < ActiveRecord::Base
   has_many :event_people, :dependent => :destroy
   has_many :events, :through => :event_people, :uniq => true
   has_many :registrations, :dependent => :destroy
+  has_many :votes, :dependent => :destroy
+  has_many :voted_events, :through => :votes, :source => :events
 
   validates :first_name, :presence => true
   validates :last_name, :presence => true

app/models/vote.rb

@@ -0,0 +1,10 @@
+class Vote < ActiveRecord::Base
+  attr_accessible :rating
+  
+  belongs_to :person
+  belongs_to :event
+  
+  delegate :first_name, :to => :person
+  delegate :last_name, :to => :person
+  delegate :public_name, :to => :person
+end