projects.mako.cc - selectricity-live/blob - app/models/election.rb

   1 class Election < ActiveRecord::Base
   2   has_many :candidates
   3   has_many :voters
   4   has_many :votes
   5   belongs_to :user
   6   validates_presence_of :name, :description
   7
   8   attr_reader :plurality_result
   9   attr_reader :approval_result
  10   attr_reader :condorcet_result
  11   attr_reader :ssd_result
  12   attr_reader :borda_result
  13
  14   require 'date'
  15
  16   def startdate
  17     read_attribute( :startdate ) || Time.now
  18   end
  19
  20   def enddate
  21     date = read_attribute( :enddate ) || Time.now + 14
  22     date - 1.second
  23   end
  24
  25   def enddate=(date)
  26     date += 1.day
  27     date = Time.gm(*date)
  28     super(date)
  29   end
  30
  31   def votes
  32     votes = Array.new
  33     self.voters.each do |voter|
  34       votes << voter.vote
  35     end
  36     return votes
  37   end
  38
  39   def destroy
  40     self.candidates.each do |candidate|
  41       candidate.destroy
  42     end
  43     super
  44   end
  45
  46   def start_blockers
  47     reasons = []
  48
  49     if self.candidates.length <= 1
  50       reasons << "You must have at least two candidates."
  51     end
  52
  53     if self.voters.length <= 1
  54       reasons << "You must have at least two voters."
  55     end
  56
  57     reasons
  58   end
  59
  60   def activate!
  61     self.active = 1
  62     self.save!
  63   end
  64
  65   def quickvote?
  66     self.class == 'QuickVote'
  67   end
  68
  69   def active?
  70     active == 1
  71   end
  72
  73   def done?
  74     active == 2
  75   end
  76
  77   def shortdesc
  78     shortdesc = description.split(/\n/)[0]
  79   end
  80
  81   def longdesc
  82     longdesc = description.split(/\n/)[1..-1].join("")
  83     longdesc.length > 0 ? longdesc : nil
  84   end
  85
  86   #Calculate Election Results
  87   def results
  88     # initalize the tallies to empty arrays
  89     preference_tally = Array.new
  90     plurality_tally = Array.new
  91     approval_tally = Array.new
  92
  93     self.voters.each do |voter|
  94       # skip if the voter has not voted or has an unconfirmed vote
  95       next unless voter.voted?
  96
  97       plurality_tally << voter.vote.rankings.sort[0].candidate.id
  98       approval_tally << voter.vote.rankings.sort[0..1].collect \
  99         { |ranking| ranking.candidate.id }
 100       preference_tally << voter.vote.rankings.sort.collect \
 101         { |ranking| ranking.candidate.id }
 102     end
 103     @plurality_result = PluralityVote.new(plurality_tally).result
 104     @approval_result = ApprovalVote.new(approval_tally).result
 105     @condorcet_result = PureCondorcetVote.new(preference_tally).result
 106     @ssd_result = CloneproofSSDVote.new(preference_tally).result
 107     @borda_result = BordaVote.new(preference_tally).result
 108     #@runoff_result = InstantRunoffVote.new(preference_tally).result
 109
 110     nil # to stay consistent
 111   end
 112
 113   def names_by_id
 114     names = Hash.new
 115
 116     competitors = self.candidates.sort.collect {|candidate| candidate.id}
 117     competitors.each do |candidate|
 118       names[candidate] = Candidate.find(candidate).name
 119     end
 120
 121     names
 122   end
 123
 124 end
 125
 126