Enable frozen string in app/models/*.rb

Partially addresses #47424.

app/controllers/admin/services_controller.rb

+# frozen_string_literal: true
+
 class Admin::ServicesController < Admin::ApplicationController
   include ServiceParams
 
@@ -30,7 +32,7 @@ class Admin::ServicesController < Admin::ApplicationController
 
   def services_templates
     Service.available_services_names.map do |service_name|
-      service_template = service_name.concat("_service").camelize.constantize
+      service_template = "#{service_name}_service".camelize.constantize
       service_template.where(template: true).first_or_create
     end
   end

app/models/ability.rb

+# frozen_string_literal: true
+
 require_dependency 'declarative_policy'
 
 class Ability

app/models/abuse_report.rb

+# frozen_string_literal: true
+
 class AbuseReport < ActiveRecord::Base
   include CacheMarkdownField
 

app/models/active_session.rb

+# frozen_string_literal: true
+
 class ActiveSession
   include ActiveModel::Model
 

app/models/appearance.rb

+# frozen_string_literal: true
+
 class Appearance < ActiveRecord::Base
   include CacheableAttributes
   include CacheMarkdownField

app/models/application_setting.rb

+# frozen_string_literal: true
+
 class ApplicationSetting < ActiveRecord::Base
   include CacheableAttributes
   include CacheMarkdownField

app/models/audit_event.rb

+# frozen_string_literal: true
+
 class AuditEvent < ActiveRecord::Base
   serialize :details, Hash # rubocop:disable Cop/ActiveRecordSerialize
 

app/models/award_emoji.rb

+# frozen_string_literal: true
+
 class AwardEmoji < ActiveRecord::Base
   DOWNVOTE_NAME = "thumbsdown".freeze
   UPVOTE_NAME   = "thumbsup".freeze

app/models/badge.rb

+# frozen_string_literal: true
+
 class Badge < ActiveRecord::Base
   # This structure sets the placeholders that the urls
   # can have. This hash also sets which action to ask when

app/models/blob.rb

+# frozen_string_literal: true
+
 # Blob is a Rails-specific wrapper around Gitlab::Git::Blob objects
 class Blob < SimpleDelegator
   CACHE_TIME = 60 # Cache raw blobs referred to by a (mutable) ref for 1 minute

app/models/board.rb

+# frozen_string_literal: true
+
 class Board < ActiveRecord::Base
   belongs_to :group
   belongs_to :project

app/models/broadcast_message.rb

+# frozen_string_literal: true
+
 class BroadcastMessage < ActiveRecord::Base
   include CacheMarkdownField
   include Sortable

app/models/chat_name.rb

+# frozen_string_literal: true
+
 class ChatName < ActiveRecord::Base
   LAST_USED_AT_INTERVAL = 1.hour
 

app/models/chat_team.rb

+# frozen_string_literal: true
+
 class ChatTeam < ActiveRecord::Base
   validates :team_id, presence: true
   validates :namespace, uniqueness: true

app/models/commit.rb

 # coding: utf-8
+# frozen_string_literal: true
+
 class Commit
   extend ActiveModel::Naming
   extend Gitlab::Cache::RequestCache
@@ -339,21 +341,21 @@ class Commit
   end
 
   def cherry_pick_description(user)
-    message_body = "(cherry picked from commit #{sha})"
+    message_body = ["(cherry picked from commit #{sha})"]
 
     if merged_merge_request?(user)
       commits_in_merge_request = merged_merge_request(user).commits
 
       if commits_in_merge_request.present?
-        message_body << "\n"
+        message_body << ""
 
         commits_in_merge_request.reverse.each do |commit_in_merge|
-          message_body << "\n#{commit_in_merge.short_id} #{commit_in_merge.title}"
+          message_body << "#{commit_in_merge.short_id} #{commit_in_merge.title}"
         end
       end
     end
 
-    message_body
+    message_body.join("\n")
   end
 
   def cherry_pick_message(user)

app/models/commit_range.rb

+# frozen_string_literal: true
+
 # CommitRange makes it easier to work with commit ranges
 #
 # Examples:

app/models/commit_status.rb

+# frozen_string_literal: true
+
 class CommitStatus < ActiveRecord::Base
   include HasStatus
   include Importable

app/models/compare.rb

+# frozen_string_literal: true
+
 class Compare
   include Gitlab::Utils::StrongMemoize
 

app/models/container_repository.rb

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

app/models/cycle_analytics.rb

+# frozen_string_literal: true
+
 class CycleAnalytics
   STAGES = %i[issue plan code test review staging production].freeze
 

app/models/dashboard_milestone.rb

+# frozen_string_literal: true
+
 class DashboardMilestone < GlobalMilestone
   def issues_finder_params
     { authorized_only: true }

app/models/deploy_key.rb

+# frozen_string_literal: true
+
 class DeployKey < Key
   include IgnorableColumn
 

app/models/deploy_keys_project.rb

+# frozen_string_literal: true
+
 class DeployKeysProject < ActiveRecord::Base
   belongs_to :project
   belongs_to :deploy_key, inverse_of: :deploy_keys_projects

app/models/deploy_token.rb

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

app/models/deployment.rb

+# frozen_string_literal: true
+
 class Deployment < ActiveRecord::Base
   include AtomicInternalId
   include IidRoutes

app/models/diff_discussion.rb

+# frozen_string_literal: true
+
 # A discussion on merge request or commit diffs consisting of `DiffNote` notes.
 #
 # A discussion of this type can be resolvable.

app/models/diff_note.rb

+# frozen_string_literal: true
+
 # A note on merge request or commit diffs
 #
 # A note of this type can be resolvable.

app/models/directly_addressed_user.rb

+# frozen_string_literal: true
+
 class DirectlyAddressedUser
   class << self
     def reference_pattern

app/models/discussion.rb

+# frozen_string_literal: true
+
 # A non-diff discussion on an issue, merge request, commit, or snippet, consisting of `DiscussionNote` notes.
 #
 # A discussion of this type can be resolvable.

app/models/discussion_note.rb

+# frozen_string_literal: true
+
 # A note in a non-diff discussion on an issue, merge request, commit, or snippet.
 #
 # A note of this type can be resolvable.

app/models/email.rb

+# frozen_string_literal: true
+
 class Email < ActiveRecord::Base
   include Sortable
   include Gitlab::SQL::Pattern

app/models/environment.rb

+# frozen_string_literal: true
+
 class Environment < ActiveRecord::Base
   # Used to generate random suffixes for the slug
   LETTERS = 'a'..'z'
@@ -173,7 +175,7 @@ class Environment < ActiveRecord::Base
   #   * cannot end with `-`
   def generate_slug
     # Lowercase letters and numbers only
-    slugified = name.to_s.downcase.gsub(/[^a-z0-9]/, '-')
+    slugified = +name.to_s.downcase.gsub(/[^a-z0-9]/, '-')
 
     # Must start with a letter
     slugified = 'env-' + slugified unless LETTERS.cover?(slugified[0])

app/models/epic.rb

+# frozen_string_literal: true
+
 # Placeholder class for model that is implemented in EE
 # It reserves '&' as a reference prefix, but the table does not exists in CE
 class Epic < ActiveRecord::Base

app/models/event.rb

+# frozen_string_literal: true
+
 class Event < ActiveRecord::Base
   include Sortable
   include IgnorableColumn

app/models/event_collection.rb

+# frozen_string_literal: true
+
 # A collection of events to display in an event list.
 #
 # An EventCollection is meant to be used for displaying events to a user (e.g.

app/models/external_issue.rb

+# frozen_string_literal: true
+
 class ExternalIssue
   include Referable
 

app/models/fork_network.rb

+# frozen_string_literal: true
+
 class ForkNetwork < ActiveRecord::Base
   belongs_to :root_project, class_name: 'Project'
   has_many :fork_network_members

app/models/fork_network_member.rb

+# frozen_string_literal: true
+
 class ForkNetworkMember < ActiveRecord::Base
   belongs_to :fork_network
   belongs_to :project

app/models/forked_project_link.rb

+# frozen_string_literal: true
+
 class ForkedProjectLink < ActiveRecord::Base
   belongs_to :forked_to_project, -> { where.not(pending_delete: true) }, class_name: 'Project'
   belongs_to :forked_from_project, -> { where.not(pending_delete: true) }, class_name: 'Project'

app/models/generic_commit_status.rb

+# frozen_string_literal: true
+
 class GenericCommitStatus < CommitStatus
   before_validation :set_default_values
 

app/models/global_label.rb

+# frozen_string_literal: true
+
 class GlobalLabel
   attr_accessor :title, :labels
   alias_attribute :name, :title

app/models/global_milestone.rb

+# frozen_string_literal: true
+
 class GlobalMilestone
   include Milestoneish
 

app/models/gpg_key.rb

+# frozen_string_literal: true
+
 class GpgKey < ActiveRecord::Base
   KEY_PREFIX = '-----BEGIN PGP PUBLIC KEY BLOCK-----'.freeze
   KEY_SUFFIX = '-----END PGP PUBLIC KEY BLOCK-----'.freeze

app/models/gpg_key_subkey.rb

+# frozen_string_literal: true
+
 class GpgKeySubkey < ActiveRecord::Base
   include ShaAttribute
 

app/models/gpg_signature.rb

+# frozen_string_literal: true
+
 class GpgSignature < ActiveRecord::Base
   include ShaAttribute
 

app/models/group.rb

+# frozen_string_literal: true
+
 require 'carrierwave/orm/activerecord'
 
 class Group < Namespace

app/models/group_custom_attribute.rb

+# frozen_string_literal: true
+
 class GroupCustomAttribute < ActiveRecord::Base
   belongs_to :group
 

app/models/group_label.rb

+# frozen_string_literal: true
+
 class GroupLabel < Label
   belongs_to :group
 

app/models/group_milestone.rb

+# frozen_string_literal: true
+
 class GroupMilestone < GlobalMilestone
   attr_accessor :group
 

app/models/guest.rb

+# frozen_string_literal: true
+
 class Guest
   class << self
     def can?(action, subject = :global)

app/models/identity.rb

+# frozen_string_literal: true
+
 class Identity < ActiveRecord::Base
   def self.uniqueness_scope
     :provider

app/models/import_export_upload.rb

+# frozen_string_literal: true
+
 class ImportExportUpload < ActiveRecord::Base
   include WithUploads
   include ObjectStorage::BackgroundMove

app/models/individual_note_discussion.rb

+# frozen_string_literal: true
+
 # A discussion to wrap a single `Note` note on the root of an issue, merge request,
 # commit, or snippet, that is not displayed as a discussion.
 #

app/models/instance_configuration.rb

+# frozen_string_literal: true
+
 require 'resolv'
 
 class InstanceConfiguration

app/models/internal_id.rb

+# frozen_string_literal: true
+
 # An InternalId is a strictly monotone sequence of integers
 # generated for a given scope and usage.
 #

app/models/issue.rb

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

app/models/issue_assignee.rb

+# frozen_string_literal: true
+
 class IssueAssignee < ActiveRecord::Base
   belongs_to :issue
   belongs_to :assignee, class_name: "User", foreign_key: :user_id

app/models/issue_collection.rb

+# frozen_string_literal: true
+
 # IssueCollection can be used to reduce a list of issues down to a subset.
 #
 # IssueCollection is not meant to be some sort of Enumerable, instead it's meant

app/models/key.rb

+# frozen_string_literal: true
+
 require 'digest/md5'
 
 class Key < ActiveRecord::Base

app/models/label.rb

+# frozen_string_literal: true
+
 class Label < ActiveRecord::Base
   include CacheMarkdownField
   include Referable

app/models/label_link.rb

+# frozen_string_literal: true
+
 class LabelLink < ActiveRecord::Base
   include Importable
 

app/models/label_priority.rb

+# frozen_string_literal: true
+
 class LabelPriority < ActiveRecord::Base
   belongs_to :project
   belongs_to :label

app/models/legacy_diff_discussion.rb

+# frozen_string_literal: true
+
 # A discussion on merge request or commit diffs consisting of `LegacyDiffNote` notes.
 #
 # All new diff discussions are of the type `DiffDiscussion`, but any diff discussions created

app/models/legacy_diff_note.rb

+# frozen_string_literal: true
+
 # A note on merge request or commit diffs, using the legacy implementation.
 #
 # All new diff notes are of the type `DiffNote`, but any diff notes created

app/models/lfs_file_lock.rb

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

app/models/lfs_object.rb

+# frozen_string_literal: true
+
 class LfsObject < ActiveRecord::Base
   include AfterCommitQueue
   include ObjectStorage::BackgroundMove

app/models/lfs_objects_project.rb

+# frozen_string_literal: true
+
 class LfsObjectsProject < ActiveRecord::Base
   belongs_to :project
   belongs_to :lfs_object

app/models/list.rb

+# frozen_string_literal: true
+
 class List < ActiveRecord::Base
   belongs_to :board
   belongs_to :label

app/models/member.rb

+# frozen_string_literal: true
+
 class Member < ActiveRecord::Base
   include AfterCommitQueue
   include Sortable

app/models/merge_request.rb

+# frozen_string_literal: true
+
 class MergeRequest < ActiveRecord::Base
   include AtomicInternalId
   include IidRoutes

app/models/merge_request_diff.rb

+# frozen_string_literal: true
+
 class MergeRequestDiff < ActiveRecord::Base
   include Sortable
   include Importable

app/models/merge_request_diff_commit.rb

+# frozen_string_literal: true
+
 class MergeRequestDiffCommit < ActiveRecord::Base
   include ShaAttribute
 

app/models/merge_request_diff_file.rb

+# frozen_string_literal: true
+
 class MergeRequestDiffFile < ActiveRecord::Base
   include Gitlab::EncodingHelper
   include DiffFile

app/models/merge_requests_closing_issues.rb

+# frozen_string_literal: true
+
 class MergeRequestsClosingIssues < ActiveRecord::Base
   belongs_to :merge_request
   belongs_to :issue

app/models/milestone.rb

+# frozen_string_literal: true
+
 class Milestone < ActiveRecord::Base
   # Represents a "No Milestone" state used for filtering Issues and Merge
   # Requests that have no milestone assigned.

app/models/namespace.rb

+# frozen_string_literal: true
+
 class Namespace < ActiveRecord::Base
   include CacheMarkdownField
   include Sortable

app/models/note.rb

+# frozen_string_literal: true
+
 # A note on the root of an issue, merge request, commit, or snippet.
 #
 # A note of this type is never resolvable.

app/models/note_diff_file.rb

+# frozen_string_literal: true
+
 class NoteDiffFile < ActiveRecord::Base
   include DiffFile
 

app/models/notification_reason.rb

+# frozen_string_literal: true
+
 # Holds reasons for a notification to have been sent as well as a priority list to select which reason to use
 # above the rest
 class NotificationReason

app/models/notification_recipient.rb

+# frozen_string_literal: true
+
 class NotificationRecipient
   include Gitlab::Utils::StrongMemoize
 

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

app/models/project_team.rb

+# frozen_string_literal: true
+
 class ProjectTeam
   include BulkMemberAccessLoad
 

app/models/protectable_dropdown.rb

+# frozen_string_literal: true
+
 class ProtectableDropdown
   REF_TYPES = %i[branches tags].freeze
 

app/models/protected_branch.rb

+# frozen_string_literal: true
+
 class ProtectedBranch < ActiveRecord::Base
   include Gitlab::ShellAdapter
   include ProtectedRef

app/models/protected_ref_matcher.rb

+# frozen_string_literal: true
+
 class ProtectedRefMatcher
   def initialize(protected_ref)
     @protected_ref = protected_ref

app/models/protected_tag.rb

+# frozen_string_literal: true
+
 class ProtectedTag < ActiveRecord::Base
   include Gitlab::ShellAdapter
   include ProtectedRef

app/models/push_event.rb

+# frozen_string_literal: true
+
 class PushEvent < Event
   # This validation exists so we can't accidentally use PushEvent with a
   # different "action" value.

app/models/push_event_payload.rb

+# frozen_string_literal: true
+
 class PushEventPayload < ActiveRecord::Base
   include ShaAttribute
 

app/models/readme_blob.rb

+# frozen_string_literal: true
+
 class ReadmeBlob < SimpleDelegator
   attr_reader :repository
 

app/models/redirect_route.rb

+# frozen_string_literal: true
+
 class RedirectRoute < ActiveRecord::Base
   belongs_to :source, polymorphic: true # rubocop:disable Cop/PolymorphicAssociations
 

app/models/release.rb

+# frozen_string_literal: true
+
 class Release < ActiveRecord::Base
   include CacheMarkdownField
 

app/models/remote_mirror.rb

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

app/models/repository.rb

+# frozen_string_literal: true
+
 require 'securerandom'
 
 class Repository

app/models/route.rb

+# frozen_string_literal: true
+
 class Route < ActiveRecord::Base
   include CaseSensitivity
 

app/models/security_event.rb

+# frozen_string_literal: true
+
 class SecurityEvent < AuditEvent
 end

app/models/sent_notification.rb

+# frozen_string_literal: true
+
 class SentNotification < ActiveRecord::Base
   serialize :position, Gitlab::Diff::Position # rubocop:disable Cop/ActiveRecordSerialize
 

app/models/service.rb

+# frozen_string_literal: true
+
 # To add new service you should build a class inherited from Service
 # and implement a set of methods
 class Service < ActiveRecord::Base

app/models/snippet.rb

+# frozen_string_literal: true
+
 class Snippet < ActiveRecord::Base
   include Gitlab::VisibilityLevel
   include CacheMarkdownField

app/models/snippet_blob.rb

+# frozen_string_literal: true
+
 class SnippetBlob
   include BlobLike
 

app/models/spam_log.rb

+# frozen_string_literal: true
+
 class SpamLog < ActiveRecord::Base
   belongs_to :user
 

app/models/subscription.rb

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

app/models/system_note_metadata.rb

+# frozen_string_literal: true
+
 class SystemNoteMetadata < ActiveRecord::Base
   # These notes's action text might contain a reference that is external.
   # We should always force a deep validation upon references that are found

app/models/term_agreement.rb

+# frozen_string_literal: true
+
 class TermAgreement < ActiveRecord::Base
   belongs_to :term, class_name: 'ApplicationSetting::Term'
   belongs_to :user

app/models/timelog.rb

+# frozen_string_literal: true
+
 class Timelog < ActiveRecord::Base
   validates :time_spent, :user, presence: true
   validate :issuable_id_is_present

app/models/todo.rb

+# frozen_string_literal: true
+
 class Todo < ActiveRecord::Base
   include Sortable
 

app/models/tree.rb

+# frozen_string_literal: true
+
 class Tree
   include Gitlab::MarkupHelper
 

app/models/trending_project.rb

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

app/models/u2f_registration.rb

+# frozen_string_literal: true
+
 # Registration information for U2F (universal 2nd factor) devices, like Yubikeys
 
 class U2fRegistration < ActiveRecord::Base

app/models/upload.rb

+# frozen_string_literal: true
+
 class Upload < ActiveRecord::Base
   # Upper limit for foreground checksum processing
   CHECKSUM_THRESHOLD = 100.megabytes

app/models/user.rb

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

app/models/user_agent_detail.rb

+# frozen_string_literal: true
+
 class UserAgentDetail < ActiveRecord::Base
   belongs_to :subject, polymorphic: true # rubocop:disable Cop/PolymorphicAssociations
 

app/models/user_callout.rb

+# frozen_string_literal: true
+
 class UserCallout < ActiveRecord::Base
   belongs_to :user
 

app/models/user_custom_attribute.rb

+# frozen_string_literal: true
+
 class UserCustomAttribute < ActiveRecord::Base
   belongs_to :user
 

app/models/user_interacted_project.rb

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

app/models/user_synced_attributes_metadata.rb

+# frozen_string_literal: true
+
 class UserSyncedAttributesMetadata < ActiveRecord::Base
   belongs_to :user
 

app/models/users_star_project.rb

+# frozen_string_literal: true
+
 class UsersStarProject < ActiveRecord::Base
   belongs_to :project, counter_cache: :star_count, touch: true
   belongs_to :user

app/models/wiki_directory.rb

+# frozen_string_literal: true
+
 class WikiDirectory
   include ActiveModel::Validations
 

app/models/wiki_page.rb

+# frozen_string_literal: true
+
 # rubocop:disable Rails/ActiveRecordAliases
 class WikiPage
   PageChangedError = Class.new(StandardError)

changelogs/unreleased/frozen-string-enable-app-models.yml

+---
+title: Enable frozen string in app/models/*.rb
+merge_request: 20851
+author: gfyoung
+type: performance

spec/controllers/admin/services_controller_spec.rb

@@ -13,7 +13,7 @@ describe Admin::ServicesController do
     Service.available_services_names.each do |service_name|
       context "#{service_name}" do
         let!(:service) do
-          service_template = service_name.concat("_service").camelize.constantize
+          service_template = "#{service_name}_service".camelize.constantize
           service_template.where(template: true).first_or_create
         end