Merge branch 'frozen-string-enable-app-models' into 'master'

Enable frozen string in app/models/*.rb

See merge request gitlab-org/gitlab-ce!20851

app/models/notification_setting.rb

+# frozen_string_literal: true
+
 class NotificationSetting < ActiveRecord::Base
   include IgnorableColumn

app/models/oauth_access_grant.rb

+# frozen_string_literal: true
+
 class OauthAccessGrant < Doorkeeper::AccessGrant
   belongs_to :resource_owner, class_name: 'User'
   belongs_to :application, class_name: 'Doorkeeper::Application'

app/models/oauth_access_token.rb

+# frozen_string_literal: true
+
 class OauthAccessToken < Doorkeeper::AccessToken
   belongs_to :resource_owner, class_name: 'User'
   belongs_to :application, class_name: 'Doorkeeper::Application'

app/models/out_of_context_discussion.rb

+# frozen_string_literal: true
+
 # When notes on a commit are displayed in the context of a merge request that
 # contains that commit, they are displayed as if they were a discussion.
 #

app/models/pages_domain.rb

+# frozen_string_literal: true
+
 class PagesDomain < ActiveRecord::Base
   VERIFICATION_KEY = 'gitlab-pages-verification-code'.freeze
   VERIFICATION_THRESHOLD = 3.days.freeze

app/models/personal_access_token.rb

+# frozen_string_literal: true
+
 class PersonalAccessToken < ActiveRecord::Base
   include Expirable
   include TokenAuthenticatable

app/models/personal_snippet.rb

+# frozen_string_literal: true
+
 class PersonalSnippet < Snippet
   include WithUploads
 end

app/models/project.rb

+# frozen_string_literal: true
+
 require 'carrierwave/orm/activerecord'
 class Project < ActiveRecord::Base

app/models/project_authorization.rb

+# frozen_string_literal: true
+
 class ProjectAuthorization < ActiveRecord::Base
   belongs_to :user
   belongs_to :project

app/models/project_auto_devops.rb

+# frozen_string_literal: true
+
 class ProjectAutoDevops < ActiveRecord::Base
   belongs_to :project

app/models/project_ci_cd_setting.rb

+# frozen_string_literal: true
+
 class ProjectCiCdSetting < ActiveRecord::Base
   belongs_to :project, inverse_of: :ci_cd_settings

app/models/project_custom_attribute.rb

+# frozen_string_literal: true
+
 class ProjectCustomAttribute < ActiveRecord::Base
   belongs_to :project

app/models/project_deploy_token.rb

+# frozen_string_literal: true
+
 class ProjectDeployToken < ActiveRecord::Base
   belongs_to :project
   belongs_to :deploy_token, inverse_of: :project_deploy_tokens

app/models/project_feature.rb

+# frozen_string_literal: true
+
 class ProjectFeature < ActiveRecord::Base
   # == Project features permissions
   #

app/models/project_group_link.rb

+# frozen_string_literal: true
+
 class ProjectGroupLink < ActiveRecord::Base
   include Expirable

app/models/project_import_data.rb

+# frozen_string_literal: true
+
 require 'carrierwave/orm/activerecord'
 class ProjectImportData < ActiveRecord::Base

app/models/project_import_state.rb

+# frozen_string_literal: true
+
 class ProjectImportState < ActiveRecord::Base
   include AfterCommitQueue

app/models/project_label.rb

+# frozen_string_literal: true
+
 class ProjectLabel < Label
   MAX_NUMBER_OF_PRIORITIES = 1

app/models/project_snippet.rb

+# frozen_string_literal: true
+
 class ProjectSnippet < Snippet
   belongs_to :project
   belongs_to :author, class_name: "User"

app/models/project_statistics.rb

+# frozen_string_literal: true
+
 class ProjectStatistics < ActiveRecord::Base
   belongs_to :project
   belongs_to :namespace