Allow deleting candidates

vote.rb

@@ -15,7 +15,7 @@ end
 
 class Candidate < ActiveRecord::Base
   belongs_to :vote
-  has_many :ratings
+  has_many :ratings, dependent: :destroy
 
   def mj
     return MajorityJudgment.new(self.ratings.collect {|r| r.value })
@@ -151,6 +151,15 @@ post '/votes/:id/candidates' do
   redirect '/votes/' + @vote.secure_id
 end
 
+post '/votes/:id/candidates/:cid/delete' do
+  redirect '/login' unless current_user
+  @vote = Vote.find_by(secure_id: params[:id])
+  redirect '/votes/' + @vote.secure_id unless @vote.state == "draft" and @vote.users.exists?(current_user.id)
+  @candidate = Candidate.find(params[:cid])
+  @candidate.destroy
+  redirect '/votes/' + @vote.secure_id
+end
+
 post '/votes/:id/open' do
   redirect '/login' unless current_user
   @vote = Vote.find_by(secure_id: params[:id])