Mark track state as not null and add default value

The regular tracks are marked as 'confirmed'

db/migrate/20170715131706_make_track_state_not_null_and_add_default_value.rb

@@ -0,0 +1,14 @@
+class MakeTrackStateNotNullAndAddDefaultValue < ActiveRecord::Migration
+  class TmpTrack < ActiveRecord::Base
+    self.table_name = 'tracks'
+  end
+
+  def change
+    TmpTrack.where(state: nil).each do |track|
+      track.state = 'confirmed'
+      track.save!
+    end
+
+    change_column :tracks, :state, :string, null: false, default: 'new'
+  end
+end

db/schema.rb

@@ -511,15 +511,15 @@ ActiveRecord::Schema.define(version: 20170807092805) do
   end
 
   create_table "tracks", force: :cascade do |t|
-    t.string   "guid",         null: false
-    t.string   "name",         null: false
+    t.string   "guid",                         null: false
+    t.string   "name",                         null: false
     t.text     "description"
     t.string   "color"
     t.datetime "created_at"
     t.datetime "updated_at"
     t.integer  "program_id"
-    t.string   "short_name",   null: false
-    t.string   "state"
+    t.string   "short_name",                   null: false
+    t.string   "state",        default: "new", null: false
     t.boolean  "cfp_active"
     t.integer  "submitter_id"
     t.integer  "room_id"