serialize the disabled_oauth_sign_in_sources

app/models/application_setting.rb

+# == Schema Information
+#
+# Table name: application_settings
+#
+#  id                                :integer          not null, primary key
+#  default_projects_limit            :integer
+#  signup_enabled                    :boolean
+#  signin_enabled                    :boolean
+#  gravatar_enabled                  :boolean
+#  sign_in_text                      :text
+#  created_at                        :datetime
+#  updated_at                        :datetime
+#  home_page_url                     :string(255)
+#  default_branch_protection         :integer          default(2)
+#  restricted_visibility_levels      :text
+#  version_check_enabled             :boolean          default(TRUE)
+#  max_attachment_size               :integer          default(10), not null
+#  default_project_visibility        :integer
+#  default_snippet_visibility        :integer
+#  default_group_visibility          :integer
+#  restricted_signup_domains         :text
+#  user_oauth_applications           :boolean          default(TRUE)
+#  after_sign_out_path               :string(255)
+#  session_expire_delay              :integer          default(10080), not null
+#  import_sources                    :text
+#  disabled_oauth_sign_in_sources    :text
+#  help_page_text                    :text
+#  admin_notification_email          :string(255)
+#  shared_runners_enabled            :boolean          default(TRUE), not null
+#  max_artifacts_size                :integer          default(100), not null
+#  runners_registration_token        :string
+#  require_two_factor_authentication :boolean          default(FALSE)
+#  two_factor_grace_period           :integer          default(48)
+#  metrics_enabled                   :boolean          default(FALSE)
+#  metrics_host                      :string           default("localhost")
+#  metrics_username                  :string
+#  metrics_password                  :string
+#  metrics_pool_size                 :integer          default(16)
+#  metrics_timeout                   :integer          default(10)
+#  metrics_method_call_threshold     :integer          default(10)
+#  recaptcha_enabled                 :boolean          default(FALSE)
+#  recaptcha_site_key                :string
+#  recaptcha_private_key             :string
+#  metrics_port                      :integer          default(8089)
+#  sentry_enabled                    :boolean          default(FALSE)
+#  sentry_dsn                        :string
+#  email_author_in_body              :boolean          default(FALSE)
+#
+
 class ApplicationSetting < ActiveRecord::Base
   include TokenAuthenticatable
   add_authentication_token_field :runners_registration_token
@@ -6,6 +55,7 @@ class ApplicationSetting < ActiveRecord::Base
 
   serialize :restricted_visibility_levels
   serialize :import_sources
+  serialize :disabled_oauth_sign_in_sources
   serialize :restricted_signup_domains, Array
   attr_accessor :restricted_signup_domains_raw