Adds the Rubocop ReturnNil copadd-rubocop-return-nil-style

This style change enforces `return if ...` instead of
`return nil if ...` to save maintainers a few minor review points

73 files changed, 96 insertions, 93 deletions

diff --git a/.rubocop.yml b/.rubocop.yml
index bcff67ded8c..2985c1446e4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -181,3 +181,6 @@ Cop/InjectEnterpriseEditionModule:
   Exclude:
     - 'spec/**/*'
     - 'ee/spec/**/*'
+
+Style/ReturnNil:
+  Enabled: true
diff --git a/app/controllers/concerns/continue_params.rb b/app/controllers/concerns/continue_params.rb
index f0e6adf4dec..54c0510497f 100644
--- a/app/controllers/concerns/continue_params.rb
+++ b/app/controllers/concerns/continue_params.rb
@@ -6,7 +6,7 @@ module ContinueParams
 
   def continue_params
     continue_params = params[:continue]
-    return nil unless continue_params
+    return unless continue_params
 
     continue_params = continue_params.permit(:to, :notice, :notice_now)
     continue_params[:to] = safe_redirect_path(continue_params[:to])
diff --git a/app/controllers/concerns/renders_notes.rb b/app/controllers/concerns/renders_notes.rb
index ce36da6b715..18015b1de88 100644
--- a/app/controllers/concerns/renders_notes.rb
+++ b/app/controllers/concerns/renders_notes.rb
@@ -16,7 +16,7 @@ module RendersNotes
   private
 
   def preload_max_access_for_authors(notes, project)
-    return nil unless project
+    return unless project
 
     user_ids = notes.map(&:author_id)
     project.team.max_member_access_for_user_ids(user_ids)
diff --git a/app/controllers/projects/application_controller.rb b/app/controllers/projects/application_controller.rb
index e0677ce3fbc..6504fd6c08a 100644
--- a/app/controllers/projects/application_controller.rb
+++ b/app/controllers/projects/application_controller.rb
@@ -17,7 +17,7 @@ class Projects::ApplicationController < ApplicationController
 
   def project
     return @project if @project
-    return nil unless params[:project_id] || params[:id]
+    return unless params[:project_id] || params[:id]
 
     path = File.join(params[:namespace_id], params[:project_id] || params[:id])
     auth_proc = ->(project) { !project.pending_delete? }
diff --git a/app/controllers/projects/merge_requests/diffs_controller.rb b/app/controllers/projects/merge_requests/diffs_controller.rb
index ddffbb17ace..aa72e4a7d52 100644
--- a/app/controllers/projects/merge_requests/diffs_controller.rb
+++ b/app/controllers/projects/merge_requests/diffs_controller.rb
@@ -47,8 +47,8 @@ class Projects::MergeRequests::DiffsController < Projects::MergeRequests::Applic
 
   # rubocop: disable CodeReuse/ActiveRecord
   def commit
-    return nil unless commit_id = params[:commit_id].presence
-    return nil unless @merge_request.all_commits.exists?(sha: commit_id)
+    return unless commit_id = params[:commit_id].presence
+    return unless @merge_request.all_commits.exists?(sha: commit_id)
 
     @commit ||= @project.commit(commit_id)
   end
diff --git a/app/controllers/uploads_controller.rb b/app/controllers/uploads_controller.rb
index 519e7439205..568c6e2a852 100644
--- a/app/controllers/uploads_controller.rb
+++ b/app/controllers/uploads_controller.rb
@@ -28,13 +28,13 @@ class UploadsController < ApplicationController
   end
 
   def find_model
-    return nil unless params[:id]
+    return unless params[:id]
 
     upload_model_class.find(params[:id])
   end
 
   def authorize_access!
-    return nil unless model
+    return unless model
 
     authorized =
       case model
@@ -54,7 +54,7 @@ class UploadsController < ApplicationController
   end
 
   def authorize_create_access!
-    return nil unless model
+    return unless model
 
     # for now we support only personal snippets comments
     authorized = can?(current_user, :comment_personal_snippet, model)
diff --git a/app/helpers/markup_helper.rb b/app/helpers/markup_helper.rb
index 66f4b7b3f30..d83c69603a9 100644
--- a/app/helpers/markup_helper.rb
+++ b/app/helpers/markup_helper.rb
@@ -74,7 +74,7 @@ module MarkupHelper
   # the tag contents are truncated without removing the closing tag.
   def first_line_in_markdown(object, attribute, max_chars = nil, options = {})
     md = markdown_field(object, attribute, options)
-    return nil unless md.present?
+    return unless md.present?
 
     tags = %w(a gl-emoji b pre code p span)
     tags << 'img' if options[:allow_images]
diff --git a/app/helpers/merge_requests_helper.rb b/app/helpers/merge_requests_helper.rb
index 23d7aa427bb..991ca42c445 100644
--- a/app/helpers/merge_requests_helper.rb
+++ b/app/helpers/merge_requests_helper.rb
@@ -29,7 +29,7 @@ module MergeRequestsHelper
 
   def ci_build_details_path(merge_request)
     build_url = merge_request.source_project.ci_service.build_page(merge_request.diff_head_sha, merge_request.source_branch)
-    return nil unless build_url
+    return unless build_url
 
     parsed_url = URI.parse(build_url)
 
@@ -92,7 +92,7 @@ module MergeRequestsHelper
   end
 
   def version_index(merge_request_diff)
-    return nil if @merge_request_diffs.empty?
+    return if @merge_request_diffs.empty?
 
     @merge_request_diffs.size - @merge_request_diffs.index(merge_request_diff)
   end
@@ -149,7 +149,7 @@ module MergeRequestsHelper
 
   def merge_request_source_project_for_project(project = @project)
     unless can?(current_user, :create_merge_request_in, project)
-      return nil
+      return
     end
 
     if can?(current_user, :create_merge_request_from, project)
diff --git a/app/helpers/notes_helper.rb b/app/helpers/notes_helper.rb
index aaf38cbfe70..a50137bea3d 100644
--- a/app/helpers/notes_helper.rb
+++ b/app/helpers/notes_helper.rb
@@ -122,7 +122,7 @@ module NotesHelper
   end
 
   def new_form_url
-    return nil unless @snippet.is_a?(PersonalSnippet)
+    return unless @snippet.is_a?(PersonalSnippet)
 
     snippet_notes_path(@snippet)
   end
diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index 6b2b7e77180..70507507606 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -754,7 +754,7 @@ module Ci
 
     # Virtual deployment status depending on the environment status.
     def deployment_status
-      return nil unless starts_environment?
+      return unless starts_environment?
 
       if success?
         return successful_deployment_status
diff --git a/app/models/commit_range.rb b/app/models/commit_range.rb
index 094747ee48d..920b1d092dd 100644
--- a/app/models/commit_range.rb
+++ b/app/models/commit_range.rb
@@ -134,25 +134,25 @@ class CommitRange
   end
 
   def sha_from
-    return nil unless @commit_from
+    return unless @commit_from
 
     @commit_from.id
   end
 
   def sha_to
-    return nil unless @commit_to
+    return unless @commit_to
 
     @commit_to.id
   end
 
   def sha_start
-    return nil unless sha_from
+    return unless sha_from
 
     exclude_start? ? sha_from + '^' : sha_from
   end
 
   def commit_start
-    return nil unless sha_start
+    return unless sha_start
 
     if exclude_start?
       @commit_start ||= project.commit(sha_start)
diff --git a/app/models/concerns/blob_language_from_git_attributes.rb b/app/models/concerns/blob_language_from_git_attributes.rb
index 70213d22147..56e1276a220 100644
--- a/app/models/concerns/blob_language_from_git_attributes.rb
+++ b/app/models/concerns/blob_language_from_git_attributes.rb
@@ -5,7 +5,7 @@ module BlobLanguageFromGitAttributes
   extend ActiveSupport::Concern
 
   def language_from_gitattributes
-    return nil unless project
+    return unless project
 
     repository = project.repository
     repository.gitattribute(path, 'gitlab-language')
diff --git a/app/models/concerns/feature_gate.rb b/app/models/concerns/feature_gate.rb
index 3f84de54ad5..bb095f113e2 100644
--- a/app/models/concerns/feature_gate.rb
+++ b/app/models/concerns/feature_gate.rb
@@ -2,7 +2,7 @@
 
 module FeatureGate
   def flipper_id
-    return nil if new_record?
+    return if new_record?
 
     "#{self.class.name}:#{id}"
   end
diff --git a/app/models/concerns/mirror_authentication.rb b/app/models/concerns/mirror_authentication.rb
index e3e1a0441f8..948094221e5 100644
--- a/app/models/concerns/mirror_authentication.rb
+++ b/app/models/concerns/mirror_authentication.rb
@@ -79,7 +79,7 @@ module MirrorAuthentication
   end
 
   def ssh_public_key
-    return nil if ssh_private_key.blank?
+    return if ssh_private_key.blank?
 
     comment = "git@#{::Gitlab.config.gitlab.host}"
     ::SSHKey.new(ssh_private_key, comment: comment).ssh_public_key
diff --git a/app/models/concerns/reactive_caching.rb b/app/models/concerns/reactive_caching.rb
index d3572875fb3..26e7094cdd8 100644
--- a/app/models/concerns/reactive_caching.rb
+++ b/app/models/concerns/reactive_caching.rb
@@ -69,7 +69,7 @@ module ReactiveCaching
     def with_reactive_cache(*args, &blk)
       unless within_reactive_cache_lifetime?(*args)
         refresh_reactive_cache!(*args)
-        return nil
+        return
       end
 
       keep_alive_reactive_cache!(*args)
diff --git a/app/models/environment.rb b/app/models/environment.rb
index 1fc088b12ae..741096060f5 100644
--- a/app/models/environment.rb
+++ b/app/models/environment.rb
@@ -119,7 +119,7 @@ class Environment < ActiveRecord::Base
   def first_deployment_for(commit_sha)
     ref = project.repository.ref_name_for_sha(ref_path, commit_sha)
 
-    return nil unless ref
+    return unless ref
 
     deployment_iid = ref.split('/').last
     deployments.find_by(iid: deployment_iid)
@@ -130,7 +130,7 @@ class Environment < ActiveRecord::Base
   end
 
   def formatted_external_url
-    return nil unless external_url
+    return unless external_url
 
     external_url.gsub(%r{\A.*?://}, '')
   end
diff --git a/app/models/error_tracking/project_error_tracking_setting.rb b/app/models/error_tracking/project_error_tracking_setting.rb
index 31084c54bdc..ccd27d98e33 100644
--- a/app/models/error_tracking/project_error_tracking_setting.rb
+++ b/app/models/error_tracking/project_error_tracking_setting.rb
@@ -111,7 +111,7 @@ module ErrorTracking
       begin
         url = Addressable::URI.parse(api_url)
       rescue Addressable::URI::InvalidURIError
-        return nil
+        return
       end
 
       @slug_match ||= url.path.match(%r{^/api/0/projects/+(?<organization>[^/]+)/+(?<project>[^/|$]+)}) || {}
diff --git a/app/models/label_note.rb b/app/models/label_note.rb
index 680952cf421..d6814f4a948 100644
--- a/app/models/label_note.rb
+++ b/app/models/label_note.rb
@@ -81,7 +81,7 @@ class LabelNote < Note
     deleted = label_refs.count - existing_refs.count
     deleted_str = deleted == 0 ? nil : "#{deleted} deleted"
 
-    return nil unless refs_str || deleted_str
+    return unless refs_str || deleted_str
 
     label_list_str = [refs_str, deleted_str].compact.join(' + ')
     suffix = 'label'.pluralize(deleted > 0 ? deleted : existing_refs.count)
diff --git a/app/models/legacy_diff_note.rb b/app/models/legacy_diff_note.rb
index 00dec6bb92b..e2c75bc7ee9 100644
--- a/app/models/legacy_diff_note.rb
+++ b/app/models/legacy_diff_note.rb
@@ -73,7 +73,7 @@ class LegacyDiffNote < Note
   private
 
   def find_diff
-    return nil unless noteable
+    return unless noteable
     return @diff if defined?(@diff)
 
     @diff = noteable.raw_diffs(Commit.max_diff_options).find do |d|
diff --git a/app/models/namespace.rb b/app/models/namespace.rb
index f7592532c5b..a5c479bdc0c 100644
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
@@ -149,7 +149,7 @@ class Namespace < ApplicationRecord
   end
 
   def find_fork_of(project)
-    return nil unless project.fork_network
+    return unless project.fork_network
 
     if Gitlab::SafeRequestStore.active?
       forks_in_namespace = Gitlab::SafeRequestStore.fetch("namespaces:#{id}:forked_projects") do
diff --git a/app/models/notification_recipient.rb b/app/models/notification_recipient.rb
index 9f16eefe074..04383aab87b 100644
--- a/app/models/notification_recipient.rb
+++ b/app/models/notification_recipient.rb
@@ -119,7 +119,7 @@ class NotificationRecipient
   private
 
   def read_ability
-    return nil if @skip_read_ability
+    return if @skip_read_ability
     return @read_ability if instance_variable_defined?(:@read_ability)
 
     @read_ability =
@@ -136,7 +136,7 @@ class NotificationRecipient
   end
 
   def default_project
-    return nil if @target.nil?
+    return if @target.nil?
     return @target if @target.is_a?(Project)
     return @target.project if @target.respond_to?(:project)
   end
diff --git a/app/models/project.rb b/app/models/project.rb
index 8f746f6e094..26d90fa00fc 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -1217,7 +1217,7 @@ class Project < ActiveRecord::Base
   end
 
   def fork_source
-    return nil unless forked?
+    return unless forked?
 
     forked_from_project || fork_network&.root_project
   end
@@ -1666,7 +1666,7 @@ class Project < ActiveRecord::Base
   end
 
   def export_path
-    return nil unless namespace.present? || hashed_storage?(:repository)
+    return unless namespace.present? || hashed_storage?(:repository)
 
     import_export_shared.archive_path
   end
diff --git a/app/models/project_services/campfire_service.rb b/app/models/project_services/campfire_service.rb
index 1d7877a1fb5..ad26e42a21b 100644
--- a/app/models/project_services/campfire_service.rb
+++ b/app/models/project_services/campfire_service.rb
@@ -57,7 +57,7 @@ class CampfireService < Service
   # https://github.com/basecamp/campfire-api/blob/master/sections/messages.md#create-message
   def speak(room_name, message, auth)
     room = rooms(auth).find { |r| r["name"] == room_name }
-    return nil unless room
+    return unless room
 
     path = "/room/#{room["id"]}/speak.json"
     body = {
diff --git a/app/models/project_services/irker_service.rb b/app/models/project_services/irker_service.rb
index 83fd9a34438..fb76bc89c98 100644
--- a/app/models/project_services/irker_service.rb
+++ b/app/models/project_services/irker_service.rb
@@ -112,7 +112,7 @@ class IrkerService < Service
   end
 
   def consider_uri(uri)
-    return nil if uri.scheme.nil?
+    return if uri.scheme.nil?
 
     # Authorize both irc://domain.com/#chan and irc://domain.com/chan
     if uri.is_a?(URI) && uri.scheme[/^ircs?\z/] && !uri.path.nil?
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 7c50b4488e5..f43c6f94bb5 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -79,7 +79,7 @@ class Repository
   end
 
   def raw_repository
-    return nil unless full_path
+    return unless full_path
 
     @raw_repository ||= initialize_raw_repository
   end
@@ -103,7 +103,7 @@ class Repository
   end
 
   def commit(ref = nil)
-    return nil unless exists?
+    return unless exists?
     return ref if ref.is_a?(::Commit)
 
     find_commit(ref || root_ref)
diff --git a/app/models/ssh_host_key.rb b/app/models/ssh_host_key.rb
index fd23cc9ac87..b6fb39ee81f 100644
--- a/app/models/ssh_host_key.rb
+++ b/app/models/ssh_host_key.rb
@@ -27,7 +27,7 @@ class SshHostKey
 
   def self.find_by(opts = {})
     opts = HashWithIndifferentAccess.new(opts)
-    return nil unless opts.key?(:id)
+    return unless opts.key?(:id)
 
     project_id, url = opts[:id].split(':', 2)
     project = Project.find_by(id: project_id)
diff --git a/app/models/user.rb b/app/models/user.rb
index 24101eda0b1..fdd9437d93b 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -469,7 +469,7 @@ class User < ApplicationRecord
     end
 
     def by_login(login)
-      return nil unless login
+      return unless login
 
       if login.include?('@'.freeze)
         unscoped.iwhere(email: login).take
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index b1d6d461928..64daba81dcf 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -132,7 +132,7 @@ class WikiPage
 
   # The GitLab Commit instance for this page.
   def version
-    return nil unless persisted?
+    return unless persisted?
 
     @version ||= @page.version
   end
diff --git a/app/serializers/concerns/user_status_tooltip.rb b/app/serializers/concerns/user_status_tooltip.rb
index aa6e67e3351..633b117d392 100644
--- a/app/serializers/concerns/user_status_tooltip.rb
+++ b/app/serializers/concerns/user_status_tooltip.rb
@@ -11,7 +11,7 @@ module UserStatusTooltip
     expose :user_status_if_loaded, as: :status_tooltip_html
 
     def user_status_if_loaded
-      return nil unless object.association(:status).loaded?
+      return unless object.association(:status).loaded?
 
       user_status(object)
     end
diff --git a/app/services/application_settings/update_service.rb b/app/services/application_settings/update_service.rb
index 2e4643ed668..9146eb96533 100644
--- a/app/services/application_settings/update_service.rb
+++ b/app/services/application_settings/update_service.rb
@@ -38,7 +38,7 @@ module ApplicationSettings
     def performance_bar_allowed_group_id
       performance_bar_enabled = !params.key?(:performance_bar_enabled) || params.delete(:performance_bar_enabled)
       group_full_path = params.delete(:performance_bar_allowed_group_path)
-      return nil unless Gitlab::Utils.to_boolean(performance_bar_enabled)
+      return unless Gitlab::Utils.to_boolean(performance_bar_enabled)
 
       Group.find_by_full_path(group_full_path)&.id if group_full_path.present?
     end
diff --git a/app/services/boards/visits/latest_service.rb b/app/services/boards/visits/latest_service.rb
index 9e4c77a6317..0e578d911f0 100644
--- a/app/services/boards/visits/latest_service.rb
+++ b/app/services/boards/visits/latest_service.rb
@@ -4,7 +4,7 @@ module Boards
   module Visits
     class LatestService < Boards::BaseService
       def execute
-        return nil unless current_user
+        return unless current_user
 
         if parent.is_a?(Group)
           BoardGroupRecentVisit.latest(current_user, parent)
diff --git a/app/services/groups/nested_create_service.rb b/app/services/groups/nested_create_service.rb
index f01f5656296..01bd685712b 100644
--- a/app/services/groups/nested_create_service.rb
+++ b/app/services/groups/nested_create_service.rb
@@ -12,7 +12,7 @@ module Groups
     end
 
     def execute
-      return nil unless group_path
+      return unless group_path
 
       if namespace = namespace_or_group(group_path)
         return namespace
diff --git a/app/services/projects/download_service.rb b/app/services/projects/download_service.rb
index dd297c9ba43..aba175eb79b 100644
--- a/app/services/projects/download_service.rb
+++ b/app/services/projects/download_service.rb
@@ -11,7 +11,7 @@ module Projects
     end
 
     def execute
-      return nil unless valid_url?(@url)
+      return unless valid_url?(@url)
 
       uploader = FileUploader.new(@project)
       uploader.download!(@url)
diff --git a/app/services/push_event_payload_service.rb b/app/services/push_event_payload_service.rb
index bb1259787af..fe366ac225b 100644
--- a/app/services/push_event_payload_service.rb
+++ b/app/services/push_event_payload_service.rb
@@ -46,7 +46,7 @@ class PushEventPayloadService
   def commit_title
     commit = @push_data.fetch(:commits).last
 
-    return nil unless commit && commit[:message]
+    return unless commit && commit[:message]
 
     raw_msg = commit[:message]
 
diff --git a/app/services/upload_service.rb b/app/services/upload_service.rb
index 41ca95b3b6f..403944557a2 100644
--- a/app/services/upload_service.rb
+++ b/app/services/upload_service.rb
@@ -6,7 +6,7 @@ class UploadService
   end
 
   def execute
-    return nil unless @file && @file.size <= max_attachment_size
+    return unless @file && @file.size <= max_attachment_size
 
     uploader = @uploader_class.new(@model, nil, @uploader_context)
     uploader.store!(@file)
diff --git a/lib/api/helpers/pagination.rb b/lib/api/helpers/pagination.rb
index de59c915d66..a140ff48723 100644
--- a/lib/api/helpers/pagination.rb
+++ b/lib/api/helpers/pagination.rb
@@ -122,7 +122,7 @@ module API
         def conditions(pagination)
           fields = pagination.fields
 
-          return nil if fields.empty?
+          return if fields.empty?
 
           placeholder = fields.map { '?' }
 
diff --git a/lib/bitbucket_server/collection.rb b/lib/bitbucket_server/collection.rb
index 7e4b2277bbe..f549acbd87f 100644
--- a/lib/bitbucket_server/collection.rb
+++ b/lib/bitbucket_server/collection.rb
@@ -25,13 +25,13 @@ module BitbucketServer
     end
 
     def prev_page
-      return nil unless current_page > 1
+      return unless current_page > 1
 
       current_page - 1
     end
 
     def next_page
-      return nil unless has_next_page?
+      return unless has_next_page?
 
       current_page + 1
     end
diff --git a/lib/declarative_policy/rule.rb b/lib/declarative_policy/rule.rb
index f38f4f0a50f..964d35cde9e 100644
--- a/lib/declarative_policy/rule.rb
+++ b/lib/declarative_policy/rule.rb
@@ -84,7 +84,7 @@ module DeclarativePolicy
       # returns nil unless it's already cached
       def cached_pass?(context)
         condition = context.condition(@name)
-        return nil unless condition.cached?
+        return unless condition.cached?
 
         condition.pass?
       end
@@ -124,7 +124,7 @@ module DeclarativePolicy
 
       def cached_pass?(context)
         condition = delegated_context(context).condition(@name)
-        return nil unless condition.cached?
+        return unless condition.cached?
 
         condition.pass?
       rescue MissingDelegate
@@ -161,7 +161,7 @@ module DeclarativePolicy
 
       def cached_pass?(context)
         runner = context.runner(@ability)
-        return nil unless runner.cached?
+        return unless runner.cached?
 
         runner.pass?
       end
diff --git a/lib/gitlab/auth/ldap/config.rb b/lib/gitlab/auth/ldap/config.rb
index 7ceb96f502b..c3a0bbc69b4 100644
--- a/lib/gitlab/auth/ldap/config.rb
+++ b/lib/gitlab/auth/ldap/config.rb
@@ -197,7 +197,7 @@ module Gitlab
 
         def encryption_options
           method = translate_method(options['encryption'])
-          return nil unless method
+          return unless method
 
           {
             method: method,
diff --git a/lib/gitlab/auth/ldap/person.rb b/lib/gitlab/auth/ldap/person.rb
index 48d134f91b0..13d67e0f871 100644
--- a/lib/gitlab/auth/ldap/person.rb
+++ b/lib/gitlab/auth/ldap/person.rb
@@ -112,7 +112,7 @@ module Gitlab
           attributes = Array(config.attributes[attribute.to_s])
           selected_attr = attributes.find { |attr| entry.respond_to?(attr) }
 
-          return nil unless selected_attr
+          return unless selected_attr
 
           entry.public_send(selected_attr) # rubocop:disable GitlabSecurity/PublicSend
         end
diff --git a/lib/gitlab/auth/saml/auth_hash.rb b/lib/gitlab/auth/saml/auth_hash.rb
index 1af9fa40c3a..b0df9757bbd 100644
--- a/lib/gitlab/auth/saml/auth_hash.rb
+++ b/lib/gitlab/auth/saml/auth_hash.rb
@@ -10,11 +10,11 @@ module Gitlab
 
         def authn_context
           response_object = auth_hash.extra[:response_object]
-          return nil if response_object.blank?
+          return if response_object.blank?
 
           document = response_object.decrypted_document
           document ||= response_object.document
-          return nil if document.blank?
+          return if document.blank?
 
           extract_authn_context(document)
         end
diff --git a/lib/gitlab/background_migration/encrypt_columns.rb b/lib/gitlab/background_migration/encrypt_columns.rb
index b9ad8267e37..32ae91c857f 100644
--- a/lib/gitlab/background_migration/encrypt_columns.rb
+++ b/lib/gitlab/background_migration/encrypt_columns.rb
@@ -91,7 +91,7 @@ module Gitlab
 
         # No need to do anything if the plaintext is nil, or an encrypted
         # value already exists
-        return nil unless plaintext.present? && !ciphertext.present?
+        return unless plaintext.present? && !ciphertext.present?
 
         # attr_encrypted will calculate and set the expected value for us
         instance.public_send("#{plain_column}=", plaintext) # rubocop:disable GitlabSecurity/PublicSend
diff --git a/lib/gitlab/background_migration/migrate_events_to_push_event_payloads.rb b/lib/gitlab/background_migration/migrate_events_to_push_event_payloads.rb
index 38fecac1bfe..42fcaa87e66 100644
--- a/lib/gitlab/background_migration/migrate_events_to_push_event_payloads.rb
+++ b/lib/gitlab/background_migration/migrate_events_to_push_event_payloads.rb
@@ -24,7 +24,7 @@ module Gitlab
         def commit_title
           commit = commits.last
 
-          return nil unless commit && commit[:message]
+          return unless commit && commit[:message]
 
           index = commit[:message].index("\n")
           message = index ? commit[:message][0..index] : commit[:message]
diff --git a/lib/gitlab/background_migration/populate_untracked_uploads_dependencies.rb b/lib/gitlab/background_migration/populate_untracked_uploads_dependencies.rb
index 4a9a62aaeb5..a84f794bfae 100644
--- a/lib/gitlab/background_migration/populate_untracked_uploads_dependencies.rb
+++ b/lib/gitlab/background_migration/populate_untracked_uploads_dependencies.rb
@@ -127,7 +127,7 @@ module Gitlab
 
           full_path = matchd[1]
           project = Gitlab::BackgroundMigration::PopulateUntrackedUploadsDependencies::Project.find_by_full_path(full_path)
-          return nil unless project
+          return unless project
 
           project.id
         end
diff --git a/lib/gitlab/bare_repository_import/importer.rb b/lib/gitlab/bare_repository_import/importer.rb
index 3cd327f5109..144ba2ec031 100644
--- a/lib/gitlab/bare_repository_import/importer.rb
+++ b/lib/gitlab/bare_repository_import/importer.rb
@@ -108,7 +108,7 @@ module Gitlab
       end
 
       def find_or_create_groups
-        return nil unless group_path.present?
+        return unless group_path.present?
 
         log " * Using namespace: #{group_path}"
 
diff --git a/lib/gitlab/bitbucket_import/importer.rb b/lib/gitlab/bitbucket_import/importer.rb
index 75a3f17f549..441fdec8a1e 100644
--- a/lib/gitlab/bitbucket_import/importer.rb
+++ b/lib/gitlab/bitbucket_import/importer.rb
@@ -47,7 +47,7 @@ module Gitlab
 
       # rubocop: disable CodeReuse/ActiveRecord
       def find_user_id(username)
-        return nil unless username
+        return unless username
 
         return users[username] if users.key?(username)
 
diff --git a/lib/gitlab/bitbucket_server_import/importer.rb b/lib/gitlab/bitbucket_server_import/importer.rb
index dbbedd5dcbe..4a789ae457f 100644
--- a/lib/gitlab/bitbucket_server_import/importer.rb
+++ b/lib/gitlab/bitbucket_server_import/importer.rb
@@ -65,7 +65,7 @@ module Gitlab
       end
 
       def find_user_id(email)
-        return nil unless email
+        return unless email
 
         return users[email] if users.key?(email)
 
diff --git a/lib/gitlab/ci/ansi2html.rb b/lib/gitlab/ci/ansi2html.rb
index 4dcb3869d4f..fba0de20ced 100644
--- a/lib/gitlab/ci/ansi2html.rb
+++ b/lib/gitlab/ci/ansi2html.rb
@@ -313,7 +313,7 @@ module Gitlab
 
         def get_term_color_class(color_index, prefix)
           color_name = COLOR[color_index]
-          return nil if color_name.nil?
+          return if color_name.nil?
 
           get_color_class(["term", prefix, color_name])
         end
diff --git a/lib/gitlab/ci/build/artifacts/metadata.rb b/lib/gitlab/ci/build/artifacts/metadata.rb
index 08dac756cc1..d45a044686e 100644
--- a/lib/gitlab/ci/build/artifacts/metadata.rb
+++ b/lib/gitlab/ci/build/artifacts/metadata.rb
@@ -103,7 +103,7 @@ module Gitlab
 
           def read_string(gz)
             string_size = read_uint32(gz)
-            return nil unless string_size
+            return unless string_size
 
             gz.read(string_size)
           end
diff --git a/lib/gitlab/ci/build/artifacts/metadata/entry.rb b/lib/gitlab/ci/build/artifacts/metadata/entry.rb
index d0a80518ae8..80e69cdcc95 100644
--- a/lib/gitlab/ci/build/artifacts/metadata/entry.rb
+++ b/lib/gitlab/ci/build/artifacts/metadata/entry.rb
@@ -44,7 +44,7 @@ module Gitlab
             end
 
             def parent
-              return nil unless has_parent?
+              return unless has_parent?
 
               self.class.new(@path.to_s.chomp(basename), @entries)
             end
diff --git a/lib/gitlab/cycle_analytics/plan_event_fetcher.rb b/lib/gitlab/cycle_analytics/plan_event_fetcher.rb
index db8ac3becea..aeca9d00156 100644
--- a/lib/gitlab/cycle_analytics/plan_event_fetcher.rb
+++ b/lib/gitlab/cycle_analytics/plan_event_fetcher.rb
@@ -40,11 +40,11 @@ module Gitlab
       end
 
       def first_time_reference_commit(event)
-        return nil unless event && merge_request_diff_commits
+        return unless event && merge_request_diff_commits
 
         commits = merge_request_diff_commits[event['id'].to_i]
 
-        return nil if commits.blank?
+        return if commits.blank?
 
         commits.find do |commit|
           next unless commit[:committed_date] && event['first_mentioned_in_commit_at']
diff --git a/lib/gitlab/database/count/tablesample_count_strategy.rb b/lib/gitlab/database/count/tablesample_count_strategy.rb
index cf1cf054dbf..fedf6ca4fe1 100644
--- a/lib/gitlab/database/count/tablesample_count_strategy.rb
+++ b/lib/gitlab/database/count/tablesample_count_strategy.rb
@@ -36,7 +36,7 @@ module Gitlab
 
         def perform_count(model, estimate)
           # If we estimate 0, we may not have statistics at all. Don't use them.
-          return nil unless estimate && estimate > 0
+          return unless estimate && estimate > 0
 
           if estimate < EXACT_COUNT_THRESHOLD
             # The table is considered small, the assumption here is that
diff --git a/lib/gitlab/diff/file.rb b/lib/gitlab/diff/file.rb
index e410d5a8333..24c91919955 100644
--- a/lib/gitlab/diff/file.rb
+++ b/lib/gitlab/diff/file.rb
@@ -75,7 +75,7 @@ module Gitlab
       end
 
       def line_for_position(pos)
-        return nil unless pos.position_type == 'text'
+        return unless pos.position_type == 'text'
 
         # This method is normally used to find which line the diff was
         # commented on, and in this context, it's normally the raw diff persisted
diff --git a/lib/gitlab/email/reply_parser.rb b/lib/gitlab/email/reply_parser.rb
index 2743f011ca6..dc44e9d7481 100644
--- a/lib/gitlab/email/reply_parser.rb
+++ b/lib/gitlab/email/reply_parser.rb
@@ -61,7 +61,7 @@ module Gitlab
 
       # Force encoding to UTF-8 on a Mail::Message or Mail::Part
       def fix_charset(object)
-        return nil if object.nil?
+        return if object.nil?
 
         if object.charset
           object.body.decoded.force_encoding(object.charset.gsub(/utf8/i, "UTF-8")).encode("UTF-8").to_s
diff --git a/lib/gitlab/fogbugz_import/importer.rb b/lib/gitlab/fogbugz_import/importer.rb
index 431911d1eee..2c53f9b026d 100644
--- a/lib/gitlab/fogbugz_import/importer.rb
+++ b/lib/gitlab/fogbugz_import/importer.rb
@@ -239,7 +239,7 @@ module Gitlab
 
         res = ::Projects::DownloadService.new(project, link).execute
 
-        return nil if res.nil?
+        return if res.nil?
 
         res[:markdown]
       end
diff --git a/lib/gitlab/git/commit.rb b/lib/gitlab/git/commit.rb
index 5863815ca85..cdec236573b 100644
--- a/lib/gitlab/git/commit.rb
+++ b/lib/gitlab/git/commit.rb
@@ -57,10 +57,10 @@ module Gitlab
           return commit_id if commit_id.is_a?(Gitlab::Git::Commit)
 
           # Some weird thing?
-          return nil unless commit_id.is_a?(String)
+          return unless commit_id.is_a?(String)
 
           # This saves us an RPC round trip.
-          return nil if commit_id.include?(':')
+          return if commit_id.include?(':')
 
           commit = wrapped_gitaly_errors do
             repo.gitaly_commit_client.find_commit(commit_id)
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 54bbd531398..8abb8867f58 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -275,7 +275,7 @@ module Gitlab
       # senddata response.
       def archive_file_path(storage_path, sha, name, format = "tar.gz")
         # Build file path
-        return nil unless name
+        return unless name
 
         extension =
           case format
diff --git a/lib/gitlab/git/tree.rb b/lib/gitlab/git/tree.rb
index 51542bcaaa2..6fcea4e12b4 100644
--- a/lib/gitlab/git/tree.rb
+++ b/lib/gitlab/git/tree.rb
@@ -44,7 +44,7 @@ module Gitlab
             entry[:name] == path_arr[0] && entry[:type] == :tree
           end
 
-          return nil unless entry
+          return unless entry
 
           if path_arr.size > 1
             path_arr.shift
diff --git a/lib/gitlab/gitaly_client.rb b/lib/gitlab/gitaly_client.rb
index 0ab53f8f706..149af25af3c 100644
--- a/lib/gitlab/gitaly_client.rb
+++ b/lib/gitlab/gitaly_client.rb
@@ -407,13 +407,13 @@ module Gitlab
 
     # Returns the stacks that calls Gitaly the most times. Used for n+1 detection
     def self.max_stacks
-      return nil unless Gitlab::SafeRequestStore.active?
+      return unless Gitlab::SafeRequestStore.active?
 
       stack_counter = Gitlab::SafeRequestStore[:stack_counter]
-      return nil unless stack_counter
+      return unless stack_counter
 
       max = max_call_count
-      return nil if max.zero?
+      return if max.zero?
 
       stack_counter.select { |_, v| v == max }.keys
     end
diff --git a/lib/gitlab/gitaly_client/blob_service.rb b/lib/gitlab/gitaly_client/blob_service.rb
index 39547328210..6b8e58e6199 100644
--- a/lib/gitlab/gitaly_client/blob_service.rb
+++ b/lib/gitlab/gitaly_client/blob_service.rb
@@ -27,7 +27,7 @@ module Gitlab
           data << msg.data
         end
 
-        return nil if blob.oid.blank?
+        return if blob.oid.blank?
 
         data = data.join
 
diff --git a/lib/gitlab/gitaly_client/operation_service.rb b/lib/gitlab/gitaly_client/operation_service.rb
index 22d2d149e65..a32607ccc5d 100644
--- a/lib/gitlab/gitaly_client/operation_service.rb
+++ b/lib/gitlab/gitaly_client/operation_service.rb
@@ -62,7 +62,7 @@ module Gitlab
         end
 
         branch = response.branch
-        return nil unless branch
+        return unless branch
 
         target_commit = Gitlab::Git::Commit.decorate(@repository, branch.target_commit)
         Gitlab::Git::Branch.new(@repository, branch.name, target_commit.id, target_commit)
diff --git a/lib/gitlab/highlight.rb b/lib/gitlab/highlight.rb
index a4e60bbd828..381f1dd4e55 100644
--- a/lib/gitlab/highlight.rb
+++ b/lib/gitlab/highlight.rb
@@ -39,7 +39,7 @@ module Gitlab
     private
 
     def custom_language
-      return nil unless @language
+      return unless @language
 
       Rouge::Lexer.find_fancy(@language)
     end
diff --git a/lib/gitlab/i18n/metadata_entry.rb b/lib/gitlab/i18n/metadata_entry.rb
index 3764e379681..4facd10bfc8 100644
--- a/lib/gitlab/i18n/metadata_entry.rb
+++ b/lib/gitlab/i18n/metadata_entry.rb
@@ -15,7 +15,7 @@ module Gitlab
       end
 
       def expected_forms
-        return nil unless plural_information
+        return unless plural_information
 
         plural_information['nplurals'].to_i
       end
diff --git a/lib/gitlab/import_export/json_hash_builder.rb b/lib/gitlab/import_export/json_hash_builder.rb
index 477499e1688..b145f37c052 100644
--- a/lib/gitlab/import_export/json_hash_builder.rb
+++ b/lib/gitlab/import_export/json_hash_builder.rb
@@ -67,7 +67,7 @@ module Gitlab
       # +value+ existing model to be included in the hash
       # +parsed_hash+ the original hash
       def parse_hash(value)
-        return nil if already_contains_methods?(value)
+        return if already_contains_methods?(value)
 
         @attributes_finder.parse(value) do |hash|
           { include: hash_or_merge(value, hash) }
diff --git a/lib/gitlab/import_export/relation_factory.rb b/lib/gitlab/import_export/relation_factory.rb
index 099b488f68e..61a1aa6da5a 100644
--- a/lib/gitlab/import_export/relation_factory.rb
+++ b/lib/gitlab/import_export/relation_factory.rb
@@ -75,7 +75,7 @@ module Gitlab
       # the relation_hash, updating references with new object IDs, mapping users using
       # the "members_mapper" object, also updating notes if required.
       def create
-        return nil if unknown_service?
+        return if unknown_service?
 
         setup_models
 
diff --git a/lib/gitlab/incoming_email.rb b/lib/gitlab/incoming_email.rb
index cc0c633b943..8b346f6d7d2 100644
--- a/lib/gitlab/incoming_email.rb
+++ b/lib/gitlab/incoming_email.rb
@@ -57,7 +57,7 @@ module Gitlab
 
       def address_regex
         wildcard_address = config.address
-        return nil unless wildcard_address
+        return unless wildcard_address
 
         regex = Regexp.escape(wildcard_address)
         regex = regex.sub(Regexp.escape(WILDCARD_PLACEHOLDER), '(.+)')
diff --git a/lib/gitlab/legacy_github_import/client.rb b/lib/gitlab/legacy_github_import/client.rb
index bc952147667..bbdd094e33b 100644
--- a/lib/gitlab/legacy_github_import/client.rb
+++ b/lib/gitlab/legacy_github_import/client.rb
@@ -68,7 +68,7 @@ module Gitlab
       end
 
       def user(login)
-        return nil unless login.present?
+        return unless login.present?
         return @users[login] if @users.key?(login)
 
         @users[login] = api.user(login)
diff --git a/lib/gitlab/legacy_github_import/user_formatter.rb b/lib/gitlab/legacy_github_import/user_formatter.rb
index ec0e221b1ff..889e6aaa968 100644
--- a/lib/gitlab/legacy_github_import/user_formatter.rb
+++ b/lib/gitlab/legacy_github_import/user_formatter.rb
@@ -25,7 +25,7 @@ module Gitlab
       end
 
       def find_by_email
-        return nil unless email
+        return unless email
 
         User.find_by_any_email(email)
             .try(:id)
@@ -33,7 +33,7 @@ module Gitlab
 
       # rubocop: disable CodeReuse/ActiveRecord
       def find_by_external_uid
-        return nil unless id
+        return unless id
 
         identities = ::Identity.arel_table
 
diff --git a/lib/gitlab/sql/pattern.rb b/lib/gitlab/sql/pattern.rb
index 92388262035..07d0acdbae9 100644
--- a/lib/gitlab/sql/pattern.rb
+++ b/lib/gitlab/sql/pattern.rb
@@ -33,7 +33,7 @@ module Gitlab
         #                     `LOWER(column) = query` instead of using `ILIKE`.
         def fuzzy_arel_match(column, query, lower_exact_match: false)
           query = query.squish
-          return nil unless query.present?
+          return unless query.present?
 
           words = select_fuzzy_words(query)
 
diff --git a/lib/gitlab/tracing/jaeger_factory.rb b/lib/gitlab/tracing/jaeger_factory.rb
index 2682007302a..93520d5667b 100644
--- a/lib/gitlab/tracing/jaeger_factory.rb
+++ b/lib/gitlab/tracing/jaeger_factory.rb
@@ -60,7 +60,7 @@ module Gitlab
         elsif udp_endpoint.present?
           sender = get_udp_sender(encoder, udp_endpoint)
         else
-          return nil
+          return
         end
 
         Jaeger::Reporters::RemoteReporter.new(
diff --git a/lib/gitlab/tree_summary.rb b/lib/gitlab/tree_summary.rb
index 453d78e2f7b..8518a13cd1c 100644
--- a/lib/gitlab/tree_summary.rb
+++ b/lib/gitlab/tree_summary.rb
@@ -95,7 +95,7 @@ module Gitlab
     end
 
     def cache_commit(commit)
-      return nil unless commit.present?
+      return unless commit.present?
 
       resolved_commits[commit.id] ||= commit
     end
diff --git a/lib/system_check/app/git_user_default_ssh_config_check.rb b/lib/system_check/app/git_user_default_ssh_config_check.rb
index 6cd53779bfd..a331f88873b 100644
--- a/lib/system_check/app/git_user_default_ssh_config_check.rb
+++ b/lib/system_check/app/git_user_default_ssh_config_check.rb
@@ -53,7 +53,7 @@ module SystemCheck
       end
 
       def ssh_dir
-        return nil unless home_dir
+        return unless home_dir
 
         File.join(home_dir, '.ssh')
       end
diff --git a/spec/support/import_export/export_file_helper.rb b/spec/support/import_export/export_file_helper.rb
index ac320934f5a..388b88f0331 100644
--- a/spec/support/import_export/export_file_helper.rb
+++ b/spec/support/import_export/export_file_helper.rb
@@ -91,7 +91,7 @@ module ExportFileHelper
     loop do
       object_with_parent = deep_find_with_parent(sensitive_word, project_hash)
 
-      return nil unless object_with_parent && object_with_parent.object
+      return unless object_with_parent && object_with_parent.object
 
       if is_safe_hash?(object_with_parent.parent, sensitive_word)
         # It's in the safe list, remove hash and keep looking