Add time_zone column to users

app/models/user.rb

@@ -22,10 +22,13 @@ class User < ActiveRecord::Base
   attr_accessible :display_name, :name, :profile_photo_url
   attr_accessible :provider, :uid
   attr_accessible :use_uploaded_picture
+  attr_accessible :time_zone
 
   protected_attributes :system_role_id
 
   validates :name, presence: true
+  validates_inclusion_of :time_zone, in: ActiveSupport::TimeZone.zones_map(&:name)
+
   before_update :send_out_notification_email, :if => :email_changed?
   after_update :update_user_course, :if => :name_changed?
 

db/migrate/20151014153816_add_time_zone_to_users.rb

@@ -0,0 +1,5 @@
+class AddTimeZoneToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :time_zone, :string
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20151011115753) do
+ActiveRecord::Schema.define(:version => 20151014153816) do
 
   create_table "achievements", :force => true do |t|
     t.string   "icon_url"
@@ -1663,6 +1663,7 @@
     t.boolean  "is_pending_deletion",                           :default => false
     t.boolean  "use_uploaded_picture",                          :default => false
     t.integer  "fb_publish_actions_request_count", :limit => 1, :default => 0,     :null => false
+    t.string   "time_zone"
   end
 
   add_index "users", ["confirmation_token"], :name => "index_users_on_confirmation_token", :unique => true