Allow delete vote

views/votes_edit.erb

@@ -56,3 +56,6 @@
 <form action="/votes/<%= @vote.secure_id %>/open" method="post">
   <button type="submit">Open vote to participants</button>
 </form>
+<form action="/votes/<%= @vote.secure_id %>/delete" method="post">
+  <button type="submit">Delete vote</button>
+</form>

vote.rb

@@ -6,9 +6,9 @@ require 'securerandom'
 require_relative 'mj'
 
 class Vote < ActiveRecord::Base
-  has_many :candidates
-  has_many :ratings
-  has_many :organizers
+  has_many :candidates, dependent: :destroy
+  has_many :ratings, dependent: :destroy
+  has_many :organizers, dependent: :destroy
   has_many :users, through: :organizers
   validates :state, inclusion: { in: ["draft", "open", "closed"] }
 end
@@ -207,6 +207,14 @@ post '/votes/:id/organizers' do
   redirect '/votes/' + @vote.secure_id
 end
 
+post '/votes/:id/delete' do
+  redirect '/login' unless current_user
+  @vote = Vote.find_by(secure_id: params[:id])
+  redirect '/votes/' + @vote.secure_id unless @vote.users.exists?(current_user.id)
+  @vote.destroy
+  redirect '/'
+end
+
 helpers do
   def current_user
     if session[:user_id]