Fix Rubocop offenses

lib/gitlab/background_migration/populate_untracked_uploads.rb

@@ -15,39 +15,39 @@ module Gitlab
           {
             pattern: /\A-\/system\/appearance\/logo\/(\d+)/,
             uploader: 'AttachmentUploader',
-            model_type: 'Appearance',
+            model_type: 'Appearance'
           },
           {
             pattern: /\A-\/system\/appearance\/header_logo\/(\d+)/,
             uploader: 'AttachmentUploader',
-            model_type: 'Appearance',
+            model_type: 'Appearance'
           },
           {
             pattern: /\A-\/system\/note\/attachment\/(\d+)/,
             uploader: 'AttachmentUploader',
-            model_type: 'Note',
+            model_type: 'Note'
           },
           {
             pattern: /\A-\/system\/user\/avatar\/(\d+)/,
             uploader: 'AvatarUploader',
-            model_type: 'User',
+            model_type: 'User'
           },
           {
             pattern: /\A-\/system\/group\/avatar\/(\d+)/,
             uploader: 'AvatarUploader',
-            model_type: 'Namespace',
+            model_type: 'Namespace'
           },
           {
             pattern: /\A-\/system\/project\/avatar\/(\d+)/,
             uploader: 'AvatarUploader',
-            model_type: 'Project',
+            model_type: 'Project'
           },
           {
             pattern: FILE_UPLOADER_PATH_PATTERN,
             uploader: 'FileUploader',
             model_type: 'Project'
-          },
-        ]
+          }
+        ].freeze
         scope :untracked, -> { where(tracked: false) }

lib/gitlab/background_migration/prepare_unhashed_uploads.rb

@@ -5,8 +5,8 @@ module Gitlab
       include Database::MigrationHelpers
       FILE_PATH_BATCH_SIZE = 500
-      UPLOAD_DIR = "#{CarrierWave.root}/uploads"
-      FOLLOW_UP_MIGRATION = 'PopulateUntrackedUploads'
+      UPLOAD_DIR = "#{CarrierWave.root}/uploads".freeze
+      FOLLOW_UP_MIGRATION = 'PopulateUntrackedUploads'.freeze
       class UnhashedUploadFile < ActiveRecord::Base
         include EachBatch
@@ -33,7 +33,7 @@ module Gitlab
       end
       def store_unhashed_upload_file_paths
-        return unless Dir.exists?(UPLOAD_DIR)
+        return unless Dir.exist?(UPLOAD_DIR)
         file_paths = []
         each_file_path(UPLOAD_DIR) do |file_path|

spec/lib/gitlab/background_migration/populate_untracked_uploads_spec.rb

@@ -129,7 +129,7 @@ describe Gitlab::BackgroundMigration::PopulateUntrackedUploads::UnhashedUploadFi
       it 'does not add an upload' do
         expect do
           unhashed_upload_file.ensure_tracked!
-        end.to_not change { upload_class.count }.from(1)
+        end.not_to change { upload_class.count }.from(1)
       end
     end
   end

spec/migrations/track_untracked_uploads_spec.rb

@@ -37,7 +37,7 @@ describe TrackUntrackedUploads, :migration, :sidekiq do
     migrate!
     max_length_namespace_path = max_length_project_path = max_length_filename = 'a' * 255
-    long_path = "./uploads#{("/#{max_length_namespace_path}") * Namespace::NUMBER_OF_ANCESTORS_ALLOWED}/#{max_length_project_path}/#{max_length_filename}"
+    long_path = "./uploads#{"/#{max_length_namespace_path}" * Namespace::NUMBER_OF_ANCESTORS_ALLOWED}/#{max_length_project_path}/#{max_length_filename}"
     unhashed_upload_file = UnhashedUploadFile.new(path: long_path)
     unhashed_upload_file.save!
     expect(UnhashedUploadFile.first.path.size).to eq(5641)
@@ -106,7 +106,7 @@ describe TrackUntrackedUploads, :migration, :sidekiq do
         expect(user1.reload.uploads.first.attributes).to include({
           "path" => "uploads/-/system/user/avatar/#{user1.id}/rails_sample.jpg",
-          "uploader" => "AvatarUploader",
+          "uploader" => "AvatarUploader"
         }.merge(rails_sample_jpg_attrs))
         expect(project1.reload.uploads.first.attributes).to include({
           "path" => "uploads/-/system/project/avatar/#{project1.id}/rails_sample.jpg",