New associations and models: schedule versioning

For the schedule versioning in the admin interface (having multiple possible shcedules) we need to change some models and associations. It has also been create a rake:move_events_attributes task to migrate the data.

User Interface addapted to make use of the introduced associations and models

db/migrate/20160704091928_create_schedules.rb

@@ -0,0 +1,9 @@
+class CreateSchedules < ActiveRecord::Migration
+  def change
+    create_table :schedules do |t|
+      t.belongs_to :program, index: true
+      t.timestamps null: false
+    end
+    add_column :programs, :selected_schedule, :integer # Selected schedule ID
+  end
+end

db/migrate/20160704092023_create_event_schedules.rb

@@ -0,0 +1,11 @@
+class CreateEventSchedules < ActiveRecord::Migration
+  def change
+    create_table :event_schedules do |t|
+      t.belongs_to :event, index: true
+      t.belongs_to :schedule, index: true
+      t.belongs_to :room, index: true
+      t.datetime :start_time
+      t.timestamps null: false
+    end
+  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: 20160624151257) do
+ActiveRecord::Schema.define(version: 20160704092023) do
 
   create_table "ahoy_events", force: :cascade do |t|
     t.uuid     "visit_id",   limit: 16
@@ -176,6 +176,19 @@ ActiveRecord::Schema.define(version: 20160624151257) do
     t.text     "cfp_dates_updated_body"
   end
 
+  create_table "event_schedules", force: :cascade do |t|
+    t.integer  "event_id"
+    t.integer  "schedule_id"
+    t.integer  "room_id"
+    t.datetime "start_time"
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+  end
+
+  add_index "event_schedules", ["event_id"], name: "index_event_schedules_on_event_id"
+  add_index "event_schedules", ["room_id"], name: "index_event_schedules_on_room_id"
+  add_index "event_schedules", ["schedule_id"], name: "index_event_schedules_on_schedule_id"
+
   create_table "event_types", force: :cascade do |t|
     t.string  "title",                                 null: false
     t.integer "length",                  default: 30
@@ -261,6 +274,7 @@ ActiveRecord::Schema.define(version: 20160624151257) do
     t.boolean  "blind_voting",      default: false
     t.datetime "voting_start_date"
     t.datetime "voting_end_date"
+    t.integer  "selected_schedule"
   end
 
   create_table "qanswers", force: :cascade do |t|
@@ -335,6 +349,14 @@ ActiveRecord::Schema.define(version: 20160624151257) do
     t.integer "venue_id", null: false
   end
 
+  create_table "schedules", force: :cascade do |t|
+    t.integer  "program_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "schedules", ["program_id"], name: "index_schedules_on_program_id"
+
   create_table "splashpages", force: :cascade do |t|
     t.integer  "conference_id"
     t.boolean  "public"