Disable multi form submit and constrin the database to only unique se…

…rver seeds.

app/assets/javascripts/application.js

@@ -21,6 +21,14 @@ var initialise = function() {
 
   $.material.init();
 
+  $('form.submit-once').submit(function(e){
+    if( $(this).hasClass('form-submitted') ){
+      e.preventDefault();
+      return;
+    }
+    $(this).addClass('form-submitted');
+  });
+
   var pusher = new Pusher('1fdb3cf163217908dd6f');
   var channel = pusher.subscribe('test_channel');
   channel.bind('my_event', function(data) {

app/views/visitors/index.html.haml

@@ -26,7 +26,7 @@
           %dd
             %input#client-seed.form-control{:type => "text"}/
     .col-md-6.well
-      = form_for(@bet, html: { role: 'form', class: 'inline-form', id: 'betForm' }) do |f|
+      = form_for(@bet, html: { role: 'form', class: 'inline-form submit-once', id: 'betForm' }) do |f|
         .row
           .col-md-12
             %label Probability of winning

db/migrate/20141217121140_add_unique_constraint_to_server_seed.rb

@@ -0,0 +1,5 @@
+class AddUniqueConstraintToServerSeed < ActiveRecord::Migration
+  def change
+    add_index(:bets, :server_seed, :unique => true)
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20141119122639) do
+ActiveRecord::Schema.define(version: 20141217121140) do
 
   create_table "balances", force: true do |t|
     t.string   "transaction_hash"
@@ -34,6 +34,8 @@
     t.datetime "updated_at"
   end
 
+  add_index "bets", ["server_seed"], name: "index_bets_on_server_seed", unique: true
+
   create_table "cashouts", force: true do |t|
     t.string   "address"
     t.integer  "amount"