Ensure `session_expire_delay` field exists before accessing it

Closes #1798

app/models/application_setting.rb

@@ -27,10 +27,10 @@ class ApplicationSetting < ActiveRecord::Base
   serialize :restricted_visibility_levels
   serialize :restricted_signup_domains, Array
   attr_accessor :restricted_signup_domains_raw
-  
-  validates :session_expire_delay, 
-  	presence: true, 
-  	numericality: { only_integer: true, greater_than_or_equal_to: 0 }
+
+  validates :session_expire_delay,
+    presence: true,
+    numericality: { only_integer: true, greater_than_or_equal_to: 0 }
 
   validates :home_page_url,
     allow_blank: true,

config/initializers/session_store.rb

 # Be sure to restart your server when you modify this file.
 
-if ActiveRecord::Base.connection.active?  && ActiveRecord::Base.connection.table_exists?('application_settings')
-  Settings.gitlab['session_expire_delay'] = ApplicationSetting.current.session_expire_delay
-end
+require 'gitlab/current_settings'
+include Gitlab::CurrentSettings
+Settings.gitlab['session_expire_delay'] = current_application_settings.session_expire_delay
 
 Gitlab::Application.config.session_store(
   :redis_store, # Using the cookie_store would enable session replay attacks.
@@ -12,4 +12,4 @@ Gitlab::Application.config.session_store(
   httponly: true,
   expire_after: Settings.gitlab['session_expire_delay'] * 60,
   path: (Rails.application.config.relative_url_root.nil?) ? '/' : Rails.application.config.relative_url_root
-)
\ No newline at end of file
+)

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: 20150604202921) do
+ActiveRecord::Schema.define(version: 20150609141121) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -29,13 +29,13 @@ ActiveRecord::Schema.define(version: 20150604202921) do
     t.boolean  "twitter_sharing_enabled",      default: true
     t.text     "restricted_visibility_levels"
     t.boolean  "version_check_enabled",        default: true
-    t.integer  "max_attachment_size",          default: 10,   null: false
+    t.integer  "max_attachment_size",          default: 10,    null: false
     t.integer  "default_project_visibility"
     t.integer  "default_snippet_visibility"
     t.text     "restricted_signup_domains"
     t.boolean  "user_oauth_applications",      default: true
     t.string   "after_sign_out_path"
-    t.integer  "session_expire_delay",       default: 10080, null: false
+    t.integer  "session_expire_delay",         default: 10080, null: false
   end
 
   create_table "broadcast_messages", force: true do |t|
@@ -496,12 +496,12 @@ ActiveRecord::Schema.define(version: 20150604202921) do
     t.string   "bitbucket_access_token"
     t.string   "bitbucket_access_token_secret"
     t.string   "location"
-    t.string   "public_email",                  default: "",    null: false
     t.string   "encrypted_otp_secret"
     t.string   "encrypted_otp_secret_iv"
     t.string   "encrypted_otp_secret_salt"
     t.boolean  "otp_required_for_login"
     t.text     "otp_backup_codes"
+    t.string   "public_email",                  default: "",    null: false
   end
 
   add_index "users", ["admin"], name: "index_users_on_admin", using: :btree