Upgrade to Rails 5.2upgrade-rails-5-2-ce

Updates changed method names and fixes spec failures

53 files changed, 225 insertions, 238 deletions

diff --git a/Gemfile b/Gemfile
index 99dce3ba067..20eeb7cc5ea 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rails', '5.1.7'
+gem 'rails', '5.2.3'
 
 # Improves copy-on-write performance for MRI
 gem 'nakayoshi_fork', '~> 0.0.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1a3b3b8e125..bf469de3835 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,44 +6,48 @@ GEM
     ace-rails-ap (4.1.2)
     acme-client (2.0.2)
       faraday (~> 0.9, >= 0.9.1)
-    actioncable (5.1.7)
-      actionpack (= 5.1.7)
+    actioncable (5.2.3)
+      actionpack (= 5.2.3)
       nio4r (~> 2.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.1.7)
-      actionpack (= 5.1.7)
-      actionview (= 5.1.7)
-      activejob (= 5.1.7)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.3)
+      actionpack (= 5.2.3)
+      actionview (= 5.2.3)
+      activejob (= 5.2.3)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.7)
-      actionview (= 5.1.7)
-      activesupport (= 5.1.7)
+    actionpack (5.2.3)
+      actionview (= 5.2.3)
+      activesupport (= 5.2.3)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.7)
-      activesupport (= 5.1.7)
+    actionview (5.2.3)
+      activesupport (= 5.2.3)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.7)
-      activesupport (= 5.1.7)
+    activejob (5.2.3)
+      activesupport (= 5.2.3)
       globalid (>= 0.3.6)
-    activemodel (5.1.7)
-      activesupport (= 5.1.7)
-    activerecord (5.1.7)
-      activemodel (= 5.1.7)
-      activesupport (= 5.1.7)
-      arel (~> 8.0)
+    activemodel (5.2.3)
+      activesupport (= 5.2.3)
+    activerecord (5.2.3)
+      activemodel (= 5.2.3)
+      activesupport (= 5.2.3)
+      arel (>= 9.0)
     activerecord-explain-analyze (0.1.0)
       activerecord (>= 4)
       pg
     activerecord_sane_schema_dumper (1.0)
       rails (>= 5, < 6)
-    activesupport (5.1.7)
+    activestorage (5.2.3)
+      actionpack (= 5.2.3)
+      activerecord (= 5.2.3)
+      marcel (~> 0.3.1)
+    activesupport (5.2.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -60,7 +64,7 @@ GEM
     apollo_upload_server (2.0.0.beta.3)
       graphql (>= 1.8)
       rails (>= 4.2)
-    arel (8.0.0)
+    arel (9.0.0)
     asana (0.8.1)
       faraday (~> 0.9)
       faraday_middleware (~> 0.9)
@@ -504,6 +508,8 @@ GEM
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     mail_room (0.9.1)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
     mdl (0.5.0)
       kramdown (~> 1.12, >= 1.12.0)
       mixlib-cli (~> 1.7, >= 1.7.0)
@@ -706,17 +712,18 @@ GEM
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rack-timeout (0.5.1)
-    rails (5.1.7)
-      actioncable (= 5.1.7)
-      actionmailer (= 5.1.7)
-      actionpack (= 5.1.7)
-      actionview (= 5.1.7)
-      activejob (= 5.1.7)
-      activemodel (= 5.1.7)
-      activerecord (= 5.1.7)
-      activesupport (= 5.1.7)
+    rails (5.2.3)
+      actioncable (= 5.2.3)
+      actionmailer (= 5.2.3)
+      actionpack (= 5.2.3)
+      actionview (= 5.2.3)
+      activejob (= 5.2.3)
+      activemodel (= 5.2.3)
+      activerecord (= 5.2.3)
+      activestorage (= 5.2.3)
+      activesupport (= 5.2.3)
       bundler (>= 1.3.0)
-      railties (= 5.1.7)
+      railties (= 5.2.3)
       sprockets-rails (>= 2.0.0)
     rails-controller-testing (1.0.2)
       actionpack (~> 5.x, >= 5.0.1)
@@ -730,12 +737,12 @@ GEM
     rails-i18n (5.1.1)
       i18n (>= 0.7, < 2)
       railties (>= 5.0, < 6)
-    railties (5.1.7)
-      actionpack (= 5.1.7)
-      activesupport (= 5.1.7)
+    railties (5.2.3)
+      actionpack (= 5.2.3)
+      activesupport (= 5.2.3)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
+      thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     raindrops (0.19.0)
     rake (12.3.2)
@@ -1019,7 +1026,7 @@ GEM
       hashdiff
     webpack-rails (0.9.11)
       railties (>= 3.2.0)
-    websocket-driver (0.6.5)
+    websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
     wikicloth (0.8.1)
@@ -1206,7 +1213,7 @@ DEPENDENCIES
   rack-oauth2 (~> 1.9.3)
   rack-proxy (~> 0.6.0)
   rack-timeout
-  rails (= 5.1.7)
+  rails (= 5.2.3)
   rails-controller-testing
   rails-i18n (~> 5.1)
   rainbow (~> 3.0)
diff --git a/app/controllers/concerns/requires_whitelisted_monitoring_client.rb b/app/controllers/concerns/requires_whitelisted_monitoring_client.rb
index f47ead2f0da..2e9905997db 100644
--- a/app/controllers/concerns/requires_whitelisted_monitoring_client.rb
+++ b/app/controllers/concerns/requires_whitelisted_monitoring_client.rb
@@ -28,7 +28,7 @@ module RequiresWhitelistedMonitoringClient
   def valid_token?
     token = params[:token].presence || request.headers['TOKEN']
     token.present? &&
-      ActiveSupport::SecurityUtils.variable_size_secure_compare(
+      ActiveSupport::SecurityUtils.secure_compare(
         token,
         Gitlab::CurrentSettings.health_check_access_token
       )
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index 797833e3f91..dbddee47997 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -107,7 +107,7 @@ class GroupsController < Groups::ApplicationController
     if Groups::UpdateService.new(@group, current_user, group_params).execute
       redirect_to edit_group_path(@group, anchor: params[:update_section]), notice: "Group '#{@group.name}' was successfully updated."
     else
-      @group.restore_path!
+      @group.path = @group.path_before_last_save || @group.path_was
 
       render action: "edit"
     end
diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index ae7a1108841..635fcc86166 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -578,7 +578,7 @@ module Ci
     end
 
     def valid_token?(token)
-      self.token && ActiveSupport::SecurityUtils.variable_size_secure_compare(token, self.token)
+      self.token && ActiveSupport::SecurityUtils.secure_compare(token, self.token)
     end
 
     def has_tags?
diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index 20ca4a9ab24..2262282e647 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -196,7 +196,7 @@ module Ci
       sql = 'CASE ci_pipelines.source WHEN (?) THEN 0 ELSE 1 END, ci_pipelines.id DESC'
       query = ApplicationRecord.send(:sanitize_sql_array, [sql, sources[:merge_request_event]]) # rubocop:disable GitlabSecurity/PublicSend
 
-      order(query)
+      order(Arel.sql(query))
     end
 
     scope :for_user, -> (user) { where(user: user) }
diff --git a/app/models/concerns/has_status.rb b/app/models/concerns/has_status.rb
index 78bcce2f592..27a5c3d5286 100644
--- a/app/models/concerns/has_status.rb
+++ b/app/models/concerns/has_status.rb
@@ -33,22 +33,24 @@ module HasStatus
       canceled = scope_relevant.canceled.select('count(*)').to_sql
       warnings = scope_warnings.select('count(*) > 0').to_sql.presence || 'false'
 
-      "(CASE
-        WHEN (#{builds})=(#{skipped}) AND (#{warnings}) THEN 'success'
-        WHEN (#{builds})=(#{skipped}) THEN 'skipped'
-        WHEN (#{builds})=(#{success}) THEN 'success'
-        WHEN (#{builds})=(#{created}) THEN 'created'
-        WHEN (#{builds})=(#{preparing}) THEN 'preparing'
-        WHEN (#{builds})=(#{success})+(#{skipped}) THEN 'success'
-        WHEN (#{builds})=(#{success})+(#{skipped})+(#{canceled}) THEN 'canceled'
-        WHEN (#{builds})=(#{created})+(#{skipped})+(#{pending}) THEN 'pending'
-        WHEN (#{running})+(#{pending})>0 THEN 'running'
-        WHEN (#{manual})>0 THEN 'manual'
-        WHEN (#{scheduled})>0 THEN 'scheduled'
-        WHEN (#{preparing})>0 THEN 'preparing'
-        WHEN (#{created})>0 THEN 'running'
-        ELSE 'failed'
-      END)"
+      Arel.sql(
+        "(CASE
+          WHEN (#{builds})=(#{skipped}) AND (#{warnings}) THEN 'success'
+          WHEN (#{builds})=(#{skipped}) THEN 'skipped'
+          WHEN (#{builds})=(#{success}) THEN 'success'
+          WHEN (#{builds})=(#{created}) THEN 'created'
+          WHEN (#{builds})=(#{preparing}) THEN 'preparing'
+          WHEN (#{builds})=(#{success})+(#{skipped}) THEN 'success'
+          WHEN (#{builds})=(#{success})+(#{skipped})+(#{canceled}) THEN 'canceled'
+          WHEN (#{builds})=(#{created})+(#{skipped})+(#{pending}) THEN 'pending'
+          WHEN (#{running})+(#{pending})>0 THEN 'running'
+          WHEN (#{manual})>0 THEN 'manual'
+          WHEN (#{scheduled})>0 THEN 'scheduled'
+          WHEN (#{preparing})>0 THEN 'preparing'
+          WHEN (#{created})>0 THEN 'running'
+          ELSE 'failed'
+        END)"
+      )
     end
 
     def status
@@ -88,22 +90,22 @@ module HasStatus
       state :scheduled, value: 'scheduled'
     end
 
-    scope :created, -> { where(status: 'created') }
-    scope :preparing, -> { where(status: 'preparing') }
-    scope :relevant, -> { where(status: AVAILABLE_STATUSES - ['created']) }
-    scope :running, -> { where(status: 'running') }
-    scope :pending, -> { where(status: 'pending') }
-    scope :success, -> { where(status: 'success') }
-    scope :failed, -> { where(status: 'failed') }
-    scope :canceled, -> { where(status: 'canceled') }
-    scope :skipped, -> { where(status: 'skipped') }
-    scope :manual, -> { where(status: 'manual') }
-    scope :scheduled, -> { where(status: 'scheduled') }
-    scope :alive, -> { where(status: [:created, :preparing, :pending, :running]) }
-    scope :created_or_pending, -> { where(status: [:created, :pending]) }
-    scope :running_or_pending, -> { where(status: [:running, :pending]) }
-    scope :finished, -> { where(status: [:success, :failed, :canceled]) }
-    scope :failed_or_canceled, -> { where(status: [:failed, :canceled]) }
+    scope :created, -> { with_status(:created) }
+    scope :preparing, -> { with_status(:preparing) }
+    scope :relevant, -> { without_status(:created) }
+    scope :running, -> { with_status(:running) }
+    scope :pending, -> { with_status(:pending) }
+    scope :success, -> { with_status(:success) }
+    scope :failed, -> { with_status(:failed) }
+    scope :canceled, -> { with_status(:canceled) }
+    scope :skipped, -> { with_status(:skipped) }
+    scope :manual, -> { with_status(:manual) }
+    scope :scheduled, -> { with_status(:scheduled) }
+    scope :alive, -> { with_status(:created, :preparing, :pending, :running) }
+    scope :created_or_pending, -> { with_status(:created, :pending) }
+    scope :running_or_pending, -> { with_status(:running, :pending) }
+    scope :finished, -> { with_status(:success, :failed, :canceled) }
+    scope :failed_or_canceled, -> { with_status(:failed, :canceled) }
 
     scope :cancelable, -> do
       where(status: [:running, :preparing, :pending, :created, :scheduled])
diff --git a/app/models/concerns/relative_positioning.rb b/app/models/concerns/relative_positioning.rb
index 22b6b1d720c..e4fe46d722a 100644
--- a/app/models/concerns/relative_positioning.rb
+++ b/app/models/concerns/relative_positioning.rb
@@ -179,7 +179,7 @@ module RelativePositioning
     relation = yield relation if block_given?
 
     relation
-      .pluck(self.class.parent_column, "#{calculation}(relative_position) AS position")
+      .pluck(self.class.parent_column, Arel.sql("#{calculation}(relative_position) AS position"))
       .first&.
       last
   end
diff --git a/app/models/concerns/routable.rb b/app/models/concerns/routable.rb
index b9ffc64e4a9..9becab632f3 100644
--- a/app/models/concerns/routable.rb
+++ b/app/models/concerns/routable.rb
@@ -46,7 +46,7 @@ module Routable
       # See https://gitlab.com/gitlab-org/gitlab-ce/issues/18603. Also note that
       # our unique index is case-sensitive in Postgres.
       binary = Gitlab::Database.mysql? ? 'BINARY' : ''
-      order_sql = "(CASE WHEN #{binary} routes.path = #{connection.quote(path)} THEN 0 ELSE 1 END)"
+      order_sql = Arel.sql("(CASE WHEN #{binary} routes.path = #{connection.quote(path)} THEN 0 ELSE 1 END)")
       found = where_full_path_in([path]).reorder(order_sql).take
       return found if found
 
diff --git a/app/models/concerns/token_authenticatable.rb b/app/models/concerns/token_authenticatable.rb
index 8c769be0489..1293df571a3 100644
--- a/app/models/concerns/token_authenticatable.rb
+++ b/app/models/concerns/token_authenticatable.rb
@@ -52,7 +52,7 @@ module TokenAuthenticatable
 
       mod.define_method("#{token_field}_matches?") do |other_token|
         token = read_attribute(token_field)
-        token.present? && ActiveSupport::SecurityUtils.variable_size_secure_compare(other_token, token)
+        token.present? && ActiveSupport::SecurityUtils.secure_compare(other_token, token)
       end
     end
 
diff --git a/app/models/email.rb b/app/models/email.rb
index 0ddaa049c3b..580633d3232 100644
--- a/app/models/email.rb
+++ b/app/models/email.rb
@@ -4,9 +4,8 @@ class Email < ApplicationRecord
   include Sortable
   include Gitlab::SQL::Pattern
 
-  belongs_to :user
+  belongs_to :user, optional: false
 
-  validates :user_id, presence: true
   validates :email, presence: true, uniqueness: true, devise_email: true
   validate :unique_email, if: ->(email) { email.email_changed? }
 
diff --git a/app/models/merge_requests_closing_issues.rb b/app/models/merge_requests_closing_issues.rb
index 22cedf57b86..5c53cfd8c27 100644
--- a/app/models/merge_requests_closing_issues.rb
+++ b/app/models/merge_requests_closing_issues.rb
@@ -25,7 +25,7 @@ class MergeRequestsClosingIssues < ApplicationRecord
 
   class << self
     def count_for_collection(ids, current_user)
-      closing_merge_requests(ids, current_user).group(:issue_id).pluck('issue_id', 'COUNT(*) as count')
+      closing_merge_requests(ids, current_user).group(:issue_id).pluck('issue_id', Arel.sql('COUNT(*) as count'))
     end
 
     def count_for_issue(id, current_user)
diff --git a/app/models/project.rb b/app/models/project.rb
index a6e0b5722b6..b278b2792f4 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -357,7 +357,7 @@ class Project < ApplicationRecord
   scope :with_unmigrated_storage, -> { where('storage_version < :version OR storage_version IS NULL', version: LATEST_STORAGE_VERSION) }
 
   # last_activity_at is throttled every minute, but last_repository_updated_at is updated with every push
-  scope :sorted_by_activity, -> { reorder("GREATEST(COALESCE(last_activity_at, '1970-01-01'), COALESCE(last_repository_updated_at, '1970-01-01')) DESC") }
+  scope :sorted_by_activity, -> { reorder(Arel.sql("GREATEST(COALESCE(last_activity_at, '1970-01-01'), COALESCE(last_repository_updated_at, '1970-01-01')) DESC")) }
   scope :sorted_by_stars_desc, -> { reorder(star_count: :desc) }
   scope :sorted_by_stars_asc, -> { reorder(star_count: :asc) }
 
@@ -612,7 +612,7 @@ class Project < ApplicationRecord
     end
   end
 
-  def initialize(attributes = {})
+  def initialize(attributes = nil)
     # We can't use default_value_for because the database has a default
     # value of 0 for visibility_level. If someone attempts to create a
     # private project, default_value_for will assume that the
@@ -622,6 +622,8 @@ class Project < ApplicationRecord
     #
     # To fix the problem, we assign the actual default in the application if
     # no explicit visibility has been initialized.
+    attributes ||= {}
+
     unless visibility_attribute_present?(attributes)
       attributes[:visibility_level] = Gitlab::CurrentSettings.default_project_visibility
     end
@@ -1557,7 +1559,7 @@ class Project < ApplicationRecord
   end
 
   def valid_runners_token?(token)
-    self.runners_token && ActiveSupport::SecurityUtils.variable_size_secure_compare(token, self.runners_token)
+    self.runners_token && ActiveSupport::SecurityUtils.secure_compare(token, self.runners_token)
   end
 
   # rubocop: disable CodeReuse/ServiceClass
diff --git a/app/models/project_services/ci_service.rb b/app/models/project_services/ci_service.rb
index f0ef2d925ab..47106d7bdbb 100644
--- a/app/models/project_services/ci_service.rb
+++ b/app/models/project_services/ci_service.rb
@@ -7,7 +7,7 @@ class CiService < Service
   default_value_for :category, 'ci'
 
   def valid_token?(token)
-    self.respond_to?(:token) && self.token.present? && ActiveSupport::SecurityUtils.variable_size_secure_compare(token, self.token)
+    self.respond_to?(:token) && self.token.present? && ActiveSupport::SecurityUtils.secure_compare(token, self.token)
   end
 
   def self.supported_events
diff --git a/app/models/project_services/slash_commands_service.rb b/app/models/project_services/slash_commands_service.rb
index bfabc6d262c..5f5cff97808 100644
--- a/app/models/project_services/slash_commands_service.rb
+++ b/app/models/project_services/slash_commands_service.rb
@@ -12,7 +12,7 @@ class SlashCommandsService < Service
   def valid_token?(token)
     self.respond_to?(:token) &&
       self.token.present? &&
-      ActiveSupport::SecurityUtils.variable_size_secure_compare(token, self.token)
+      ActiveSupport::SecurityUtils.secure_compare(token, self.token)
   end
 
   def self.supported_events
diff --git a/app/services/ci/process_pipeline_service.rb b/app/services/ci/process_pipeline_service.rb
index 4a7ce00b8e2..aaf56048b5c 100644
--- a/app/services/ci/process_pipeline_service.rb
+++ b/app/services/ci/process_pipeline_service.rb
@@ -44,7 +44,7 @@ module Ci
 
     # rubocop: disable CodeReuse/ActiveRecord
     def stage_indexes_of_created_processables
-      created_processables.order(:stage_idx).pluck('distinct stage_idx')
+      created_processables.order(:stage_idx).pluck(Arel.sql('DISTINCT stage_idx'))
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
@@ -68,7 +68,7 @@ module Ci
       latest_statuses = pipeline.statuses.latest
         .group(:name)
         .having('count(*) > 1')
-        .pluck('max(id)', 'name')
+        .pluck(Arel.sql('MAX(id)'), 'name')
 
       # mark builds that are retried
       pipeline.statuses.latest
diff --git a/app/services/groups/create_service.rb b/app/services/groups/create_service.rb
index e9659f5489a..e78e5d5fc2c 100644
--- a/app/services/groups/create_service.rb
+++ b/app/services/groups/create_service.rb
@@ -27,8 +27,7 @@ module Groups
         @group.build_chat_team(name: response['name'], team_id: response['id'])
       end
 
-      @group.save
-      @group.add_owner(current_user)
+      @group.add_owner(current_user) if @group.save
       @group
     end
 
diff --git a/bin/bundle b/bin/bundle
index 66e9889e8b4..f19acf5b5cc 100755
--- a/bin/bundle
+++ b/bin/bundle
@@ -1,3 +1,3 @@
 #!/usr/bin/env ruby
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 load Gem.bin_path('bundler', 'bundle')
diff --git a/bin/setup b/bin/setup
index 883825bc0a2..94fd4d79775 100755
--- a/bin/setup
+++ b/bin/setup
@@ -1,33 +1,36 @@
 #!/usr/bin/env ruby
-
-require "pathname"
+require 'fileutils'
+include FileUtils
 
 # path to your application root.
-APP_ROOT = Pathname.new File.expand_path("../../", __FILE__)
+APP_ROOT = File.expand_path('..', __dir__)
 
 def system!(*args)
   system(*args) || abort("\n== Command #{args} failed ==")
 end
 
-Dir.chdir APP_ROOT do
-  # This script is a starting point to set up your application.
-  # Add necessary setup steps to this file:
+chdir APP_ROOT do
+  # This script is a starting point to setup your application.
+  # Add necessary setup steps to this file.
+
+  puts '== Installing dependencies =='
+  system! 'gem install bundler --conservative'
+  system('bundle check') || system!('bundle install')
 
-  puts "== Installing dependencies =="
-  system! "gem install bundler --conservative"
-  system("bundle check") || system!("bundle install")
+  # Install JavaScript dependencies if using Yarn
+  # system('bin/yarn')
 
   # puts "\n== Copying sample files =="
-  # unless File.exist?("config/database.yml")
-  #   cp "config/database.yml.sample", "config/database.yml"
+  # unless File.exist?('config/database.yml')
+  #   cp 'config/database.yml.sample', 'config/database.yml'
   # end
 
   puts "\n== Preparing database =="
-  system! "bin/rails db:setup"
+  system! 'bin/rails db:setup'
 
   puts "\n== Removing old logs and tempfiles =="
-  system! "bin/rails log:clear tmp:clear"
+  system! 'bin/rails log:clear tmp:clear'
 
   puts "\n== Restarting application server =="
-  system! "bin/rails restart"
+  system! 'bin/rails restart'
 end
diff --git a/bin/update b/bin/update
index a8e4462f203..58bfaed518c 100755
--- a/bin/update
+++ b/bin/update
@@ -1,10 +1,9 @@
 #!/usr/bin/env ruby
-require 'pathname'
 require 'fileutils'
 include FileUtils
 
 # path to your application root.
-APP_ROOT = Pathname.new File.expand_path('../../', __FILE__)
+APP_ROOT = File.expand_path('..', __dir__)
 
 def system!(*args)
   system(*args) || abort("\n== Command #{args} failed ==")
@@ -18,6 +17,9 @@ chdir APP_ROOT do
   system! 'gem install bundler --conservative'
   system('bundle check') || system!('bundle install')
 
+  # Install JavaScript dependencies if using Yarn
+  # system('bin/yarn')
+
   puts "\n== Updating database =="
   system! 'bin/rails db:migrate'
 
diff --git a/bin/yarn b/bin/yarn
new file mode 100755
index 00000000000..460dd565b4a
--- /dev/null
+++ b/bin/yarn
@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+APP_ROOT = File.expand_path('..', __dir__)
+Dir.chdir(APP_ROOT) do
+  begin
+    exec "yarnpkg", *ARGV
+  rescue Errno::ENOENT
+    $stderr.puts "Yarn executable was not detected in the system."
+    $stderr.puts "Download Yarn at https://yarnpkg.com/en/docs/install"
+    exit 1
+  end
+end
diff --git a/config/application.rb b/config/application.rb
index edf8b3e87f9..de386506233 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,8 +1,14 @@
-require File.expand_path('boot', __dir__)
+require_relative 'boot'
 
-require 'rails/all'
+# Based on https://github.com/rails/rails/blob/v5.2.3/railties/lib/rails/all.rb
+# Only load the railties we need instead of loading everything
+require 'active_record/railtie'
+require 'action_controller/railtie'
+require 'action_view/railtie'
+require 'action_mailer/railtie'
+require 'rails/test_unit/railtie'
 
-Bundler.require(:default, Rails.env)
+Bundler.require(*Rails.groups)
 
 module Gitlab
   class Application < Rails::Application
@@ -25,6 +31,8 @@ module Gitlab
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.
 
+    config.active_record.sqlite3.represent_boolean_as_integer = true
+
     # Sidekiq uses eager loading, but directories not in the standard Rails
     # directories must be added to the eager load paths:
     # https://github.com/mperham/sidekiq/wiki/FAQ#why-doesnt-sidekiq-autoload-my-rails-application-code
@@ -86,13 +94,6 @@ module Gitlab
     # Configure the default encoding used in templates for Ruby 1.9.
     config.encoding = "utf-8"
 
-    # ActionCable mount point.
-    # The default Rails' mount point is `/cable` which may conflict with existing
-    # namespaces/users.
-    # https://github.com/rails/rails/blob/5-0-stable/actioncable/lib/action_cable.rb#L38
-    # Please change this value when configuring ActionCable for real usage.
-    config.action_cable.mount_path = "/-/cable"
-
     # Configure sensitive parameters which will be filtered from the log file.
     #
     # Parameters filtered:
@@ -272,5 +273,10 @@ module Gitlab
       Gitlab::Routing.add_helpers(project_url_helpers)
       Gitlab::Routing.add_helpers(MilestonesRoutingHelper)
     end
+
+    # This makes generated cookies to be compatible with Rails 5.1 and older
+    # We can remove this when we're confident that there are no issues with the Rails 5.2 upgrade
+    # and we won't need to rollback to older versions
+    config.action_dispatch.use_authenticated_cookie_encryption = false
   end
 end
diff --git a/config/environments/development.rb b/config/environments/development.rb
index ac9b02b08d5..3881f1be152 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -7,6 +7,7 @@ Rails.application.configure do
   config.cache_classes = false
 
   # Show full error reports and disable caching
+  config.active_record.verbose_query_logs  = true
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
 
diff --git a/config/environments/test.rb b/config/environments/test.rb
index e7166882eea..a564ef74734 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -23,6 +23,7 @@ Rails.application.configure do
   config.public_file_server.headers = { 'Cache-Control' => 'public, max-age=3600' }
 
   # Show full error reports and disable caching
+  config.active_record.verbose_query_logs  = true
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
 
diff --git a/config/initializers/active_record_data_types.rb b/config/initializers/active_record_data_types.rb
index e95157bfde5..151bce4d130 100644
--- a/config/initializers/active_record_data_types.rb
+++ b/config/initializers/active_record_data_types.rb
@@ -22,7 +22,7 @@ if Gitlab::Database.postgresql?
     #
     # When schema dumping, `timestamptz` columns will be output as
     # `t.datetime_with_timezone`.
-    def initialize_type_map(mapping)
+    def initialize_type_map(mapping = type_map)
       super mapping
 
       mapping.register_type 'timestamptz' do |_, _, sql_type|
@@ -51,7 +51,7 @@ elsif Gitlab::Database.mysql?
     #
     # When schema dumping, `timestamp` columns will be output as
     # `t.datetime_with_timezone`.
-    def initialize_type_map(mapping)
+    def initialize_type_map(mapping = type_map)
       super mapping
 
       mapping.register_type(/timestamp/i) do |sql_type|
diff --git a/config/initializers/active_record_preloader.rb b/config/initializers/active_record_preloader.rb
index 3b16014f302..a293909149e 100644
--- a/config/initializers/active_record_preloader.rb
+++ b/config/initializers/active_record_preloader.rb
@@ -1,9 +1,22 @@
 module ActiveRecord
   module Associations
     class Preloader
+      class NullPreloader
+        def self.new(klass, owners, reflection, preload_scope)
+          self
+        end
+
+        def self.run(preloader)
+        end
+
+        def self.preloaded_records
+          []
+        end
+      end
+
       module NoCommitPreloader
-        def preloader_for(reflection, owners, rhs_klass)
-          return NullPreloader if rhs_klass == ::Commit
+        def preloader_for(reflection, owners)
+          return NullPreloader if owners.first.association(reflection.name).klass == ::Commit
 
           super
         end
diff --git a/config/initializers/active_record_verbose_query_logs.rb b/config/initializers/active_record_verbose_query_logs.rb
deleted file mode 100644
index 1c5fbc8e830..00000000000
--- a/config/initializers/active_record_verbose_query_logs.rb
+++ /dev/null
@@ -1,56 +0,0 @@
-# frozen_string_literal: true
-
-# This is backport of https://github.com/rails/rails/pull/26815/files
-# Enabled by default for every non-production environment
-
-module ActiveRecord
-  class LogSubscriber
-    module VerboseQueryLogs
-      def debug(progname = nil, &block)
-        return unless super
-
-        log_query_source
-      end
-
-      def log_query_source
-        source_line, line_number = extract_callstack(caller_locations)
-
-        if source_line
-          if defined?(::Rails.root)
-            app_root = "#{::Rails.root}/".freeze
-            source_line = source_line.sub(app_root, "")
-          end
-
-          logger.debug("  ↳ #{source_line}:#{line_number}")
-        end
-      end
-
-      def extract_callstack(callstack)
-        line = callstack.find do |frame|
-          frame.absolute_path && !ignored_callstack(frame.absolute_path)
-        end
-
-        offending_line = line || callstack.first
-        [
-          offending_line.path,
-          offending_line.lineno,
-          offending_line.label
-        ]
-      end
-
-      LOG_SUBSCRIBER_FILE = ActiveRecord::LogSubscriber.method(:logger).source_location.first
-      RAILS_GEM_ROOT = File.expand_path("../../../..", LOG_SUBSCRIBER_FILE) + "/"
-      APP_CONFIG_ROOT = File.expand_path("..", __dir__) + "/"
-
-      def ignored_callstack(path)
-        path.start_with?(APP_CONFIG_ROOT, RAILS_GEM_ROOT, RbConfig::CONFIG["rubylibdir"])
-      end
-    end
-
-    if Rails.version.start_with?("5.2")
-      raise "Remove this monkey patch: #{__FILE__}"
-    else
-      prepend(VerboseQueryLogs) unless Rails.env.production?
-    end
-  end
-end
diff --git a/config/initializers/ar_speed_up_migration_checking.rb b/config/initializers/ar_speed_up_migration_checking.rb
index f98b246db0b..c4ffcc54cb2 100644
--- a/config/initializers/ar_speed_up_migration_checking.rb
+++ b/config/initializers/ar_speed_up_migration_checking.rb
@@ -2,17 +2,14 @@ if Rails.env.test?
   require 'active_record/migration'
 
   module ActiveRecord
-    class Migrator
-      class << self
-        alias_method :migrations_unmemoized, :migrations
+    class MigrationContext
+      alias_method :migrations_unmemoized, :migrations
 
-        # This method is called a large number of times per rspec example, and
-        # it reads + parses `db/migrate/*` each time. Memoizing it can save 0.5
-        # seconds per spec.
-        def migrations(paths)
-          @migrations ||= {}
-          (@migrations[paths] ||= migrations_unmemoized(paths)).dup
-        end
+      # This method is called a large number of times per rspec example, and
+      # it reads + parses `db/migrate/*` each time. Memoizing it can save 0.5
+      # seconds per spec.
+      def migrations
+        @migrations ||= migrations_unmemoized
       end
     end
   end
diff --git a/config/initializers/config_initializers_active_record_locking.rb b/config/initializers/config_initializers_active_record_locking.rb
index 608d63223a3..915247826e9 100644
--- a/config/initializers/config_initializers_active_record_locking.rb
+++ b/config/initializers/config_initializers_active_record_locking.rb
@@ -22,10 +22,11 @@ module ActiveRecord
           # Patched because when `lock_version` is read as `0`, it may actually be `NULL` in the DB.
           possible_previous_lock_value = previous_lock_value.to_i == 0 ? [nil, 0] : previous_lock_value
 
-          affected_rows = self.class.unscoped._update_record(
-            arel_attributes_with_values(attribute_names),
-            self.class.primary_key => id_in_database,
-            locking_column => possible_previous_lock_value
+          affected_rows = self.class.unscoped.where(
+            locking_column => possible_previous_lock_value,
+            self.class.primary_key => id_in_database
+          ).update_all(
+            attributes_with_values_for_update(attribute_names)
           )
 
           if affected_rows != 1
diff --git a/config/initializers/lograge.rb b/config/initializers/lograge.rb
index 1ad93e14f7e..fbec28186eb 100644
--- a/config/initializers/lograge.rb
+++ b/config/initializers/lograge.rb
@@ -18,7 +18,7 @@ unless Sidekiq.server?
         .map { |k, v| { key: k, value: v } }
 
       payload = {
-        time: event.time.utc.iso8601(3),
+        time: Time.now.utc.iso8601(3),
         params: params,
         remote_ip: event.payload[:remote_ip],
         user_id: event.payload[:user_id],
diff --git a/config/initializers/mysql_ignore_postgresql_options.rb b/config/initializers/mysql_ignore_postgresql_options.rb
index 9a569be7674..e6a7d9bef52 100644
--- a/config/initializers/mysql_ignore_postgresql_options.rb
+++ b/config/initializers/mysql_ignore_postgresql_options.rb
@@ -15,7 +15,6 @@ if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
     module ConnectionAdapters
       class Mysql2Adapter < AbstractMysqlAdapter
         alias_method :__gitlab_add_index, :add_index
-        alias_method :__gitlab_add_index_sql, :add_index_sql
         alias_method :__gitlab_add_index_options, :add_index_options
 
         def add_index(table_name, column_name, options = {})
@@ -24,12 +23,6 @@ if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
           end
         end
 
-        def add_index_sql(table_name, column_name, options = {})
-          unless options[:opclasses]
-            __gitlab_add_index_sql(table_name, column_name, options)
-          end
-        end
-
         def add_index_options(table_name, column_name, options = {})
           if options[:using] && options[:using] == :gin
             options = options.dup
diff --git a/config/initializers/postgresql_cte.rb b/config/initializers/postgresql_cte.rb
index 56689bc8e74..68d53c4edbf 100644
--- a/config/initializers/postgresql_cte.rb
+++ b/config/initializers/postgresql_cte.rb
@@ -94,8 +94,8 @@ module ActiveRecord
       end
     end
 
-    def build_arel
-      arel = super()
+    def build_arel(aliases)
+      arel = super
 
       build_with(arel) if @values[:with]
 
diff --git a/db/schema.rb b/db/schema.rb
index 9a8b64689bd..9d28c5d2383 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,11 +10,11 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190703130053) do
+ActiveRecord::Schema.define(version: 2019_07_03_130053) do
 
   # These are extensions that must be enabled in order to support this database
-  enable_extension "plpgsql"
   enable_extension "pg_trgm"
+  enable_extension "plpgsql"
 
   create_table "abuse_reports", id: :serial, force: :cascade do |t|
     t.integer "reporter_id"
diff --git a/lib/api/helpers/pagination.rb b/lib/api/helpers/pagination.rb
index 2a9b17ad22a..71bbc218f94 100644
--- a/lib/api/helpers/pagination.rb
+++ b/lib/api/helpers/pagination.rb
@@ -205,7 +205,9 @@ module API
 
           limited_total_count = pagination_data.total_count_with_limit
           if limited_total_count > Kaminari::ActiveRecordRelationMethods::MAX_COUNT_LIMIT
-            pagination_data.without_count
+            # The call to `total_count_with_limit` memoizes `@arel` because of a call to `references_eager_loaded_tables?`
+            # We need to call `reset` because `without_count` relies on `@arel` being unmemoized
+            pagination_data.reset.without_count
           else
             pagination_data
           end
diff --git a/lib/api/helpers/runner.rb b/lib/api/helpers/runner.rb
index ff73a49d5e8..100463fcb95 100644
--- a/lib/api/helpers/runner.rb
+++ b/lib/api/helpers/runner.rb
@@ -7,8 +7,7 @@ module API
       JOB_TOKEN_PARAM = :token
 
       def runner_registration_token_valid?
-        ActiveSupport::SecurityUtils.variable_size_secure_compare(params[:token],
-                                                                  Gitlab::CurrentSettings.runners_registration_token)
+        ActiveSupport::SecurityUtils.secure_compare(params[:token], Gitlab::CurrentSettings.runners_registration_token)
       end
 
       def authenticate_runner!
diff --git a/lib/gitlab/current_settings.rb b/lib/gitlab/current_settings.rb
index 469a7fd9f7b..32d5e4b9ea3 100644
--- a/lib/gitlab/current_settings.rb
+++ b/lib/gitlab/current_settings.rb
@@ -45,7 +45,7 @@ module Gitlab
         # need to be added to the application settings. To prevent Rake tasks
         # and other callers from failing, use any loaded settings and return
         # defaults for missing columns.
-        if ActiveRecord::Migrator.needs_migration?
+        if ActiveRecord::Base.connection.migration_context.needs_migration?
           db_attributes = current_settings&.attributes || {}
           fake_application_settings(db_attributes)
         elsif current_settings.present?
diff --git a/lib/gitlab/database.rb b/lib/gitlab/database.rb
index 1177f8ea99e..64e7f371115 100644
--- a/lib/gitlab/database.rb
+++ b/lib/gitlab/database.rb
@@ -128,7 +128,7 @@ module Gitlab
         order = "#{field} IS NULL, #{order}" if direction == 'ASC'
       end
 
-      order
+      Arel.sql(order)
     end
 
     def self.nulls_first_order(field, direction = 'ASC')
@@ -142,7 +142,7 @@ module Gitlab
         order = "#{field} IS NULL, #{order}" if direction == 'DESC'
       end
 
-      order
+      Arel.sql(order)
     end
 
     def self.random
diff --git a/lib/gitlab/database/grant.rb b/lib/gitlab/database/grant.rb
index 862ab96c887..26adf4e221b 100644
--- a/lib/gitlab/database/grant.rb
+++ b/lib/gitlab/database/grant.rb
@@ -24,7 +24,7 @@ module Gitlab
 
           begin
             from(nil)
-              .pluck("has_table_privilege(#{quoted_table}, 'TRIGGER')")
+              .pluck(Arel.sql("has_table_privilege(#{quoted_table}, 'TRIGGER')"))
               .first
           rescue ActiveRecord::StatementInvalid
             # This error is raised when using a non-existing table name. In this
diff --git a/spec/controllers/admin/runners_controller_spec.rb b/spec/controllers/admin/runners_controller_spec.rb
index 78c5e2a2656..bbeda7dae0f 100644
--- a/spec/controllers/admin/runners_controller_spec.rb
+++ b/spec/controllers/admin/runners_controller_spec.rb
@@ -23,10 +23,11 @@ describe Admin::RunnersController do
 
       control_count = ActiveRecord::QueryRecorder.new { get :index }.count
 
-      create(:ci_runner, :tagged_only)
+      create_list(:ci_runner, 5, :tagged_only)
 
       # There is still an N+1 query for `runner.builds.count`
-      expect { get :index }.not_to exceed_query_limit(control_count + 1)
+      # We also need to add 1 because it takes 2 queries to preload tags
+      expect { get :index }.not_to exceed_query_limit(control_count + 6)
 
       expect(response).to have_gitlab_http_status(200)
       expect(response.body).to have_content('tag1')
diff --git a/spec/helpers/avatars_helper_spec.rb b/spec/helpers/avatars_helper_spec.rb
index aa0442ab847..94998d302f9 100644
--- a/spec/helpers/avatars_helper_spec.rb
+++ b/spec/helpers/avatars_helper_spec.rb
@@ -16,7 +16,7 @@ describe AvatarsHelper do
     shared_examples 'resource with a custom avatar' do |source_type|
       it 'returns a custom avatar image' do
         expect(public_send("#{source_type}_icon", *helper_args))
-          .to eq "<img src=\"#{resource.avatar.url}\" alt=\"Banana sample\" />"
+          .to eq "<img src=\"#{resource.avatar.url}\" />"
       end
     end
 
diff --git a/spec/helpers/emails_helper_spec.rb b/spec/helpers/emails_helper_spec.rb
index e6aacb5b92b..d25f0c6de4a 100644
--- a/spec/helpers/emails_helper_spec.rb
+++ b/spec/helpers/emails_helper_spec.rb
@@ -103,7 +103,7 @@ describe EmailsHelper do
         appearance = create :appearance, header_logo: fixture_file_upload('spec/fixtures/dk.png')
 
         expect(header_logo).to eq(
-          %{<img style="height: 50px" src="/uploads/-/system/appearance/header_logo/#{appearance.id}/dk.png" alt="Dk" />}
+          %{<img style="height: 50px" src="/uploads/-/system/appearance/header_logo/#{appearance.id}/dk.png" />}
         )
       end
     end
diff --git a/spec/lib/api/helpers/pagination_spec.rb b/spec/lib/api/helpers/pagination_spec.rb
index c788da55cd2..b0a00392957 100644
--- a/spec/lib/api/helpers/pagination_spec.rb
+++ b/spec/lib/api/helpers/pagination_spec.rb
@@ -114,7 +114,7 @@ describe API::Helpers::Pagination do
             expect(paginated_relation.order_values).to be_present
             expect(paginated_relation.order_values.size).to eq(1)
             expect(paginated_relation.order_values.first).to be_descending
-            expect(paginated_relation.order_values.first.expr.name).to eq :id
+            expect(paginated_relation.order_values.first.expr.name).to eq 'id'
           end
         end
 
@@ -151,9 +151,9 @@ describe API::Helpers::Pagination do
             expect(paginated_relation.order_values).to be_present
             expect(paginated_relation.order_values.size).to eq(2)
             expect(paginated_relation.order_values.first).to be_descending
-            expect(paginated_relation.order_values.first.expr.name).to eq :name
+            expect(paginated_relation.order_values.first.expr.name).to eq 'name'
             expect(paginated_relation.order_values.second).to be_descending
-            expect(paginated_relation.order_values.second.expr.name).to eq :id
+            expect(paginated_relation.order_values.second.expr.name).to eq 'id'
           end
 
           it 'returns the right records (first page)' do
@@ -341,7 +341,7 @@ describe API::Helpers::Pagination do
           expect(resource.order_values).to be_empty
           expect(paginated_relation.order_values).to be_present
           expect(paginated_relation.order_values.first).to be_ascending
-          expect(paginated_relation.order_values.first.expr.name).to eq :id
+          expect(paginated_relation.order_values.first.expr.name).to eq 'id'
         end
 
         it 'is present it does not add anything' do
@@ -349,7 +349,7 @@ describe API::Helpers::Pagination do
 
           expect(paginated_relation.order_values).to be_present
           expect(paginated_relation.order_values.first).to be_descending
-          expect(paginated_relation.order_values.first.expr.name).to eq :created_at
+          expect(paginated_relation.order_values.first.expr.name).to eq 'created_at'
         end
       end
     end
diff --git a/spec/lib/gitlab/current_settings_spec.rb b/spec/lib/gitlab/current_settings_spec.rb
index 909dbffa38f..db31e5280a3 100644
--- a/spec/lib/gitlab/current_settings_spec.rb
+++ b/spec/lib/gitlab/current_settings_spec.rb
@@ -80,7 +80,7 @@ describe Gitlab::CurrentSettings do
           # during the initialization phase of the test suite, so instead let's mock the internals of it
           expect(ActiveRecord::Base.connection).not_to receive(:active?)
           expect(ActiveRecord::Base.connection).not_to receive(:cached_table_exists?)
-          expect(ActiveRecord::Migrator).not_to receive(:needs_migration?)
+          expect_any_instance_of(ActiveRecord::MigrationContext).not_to receive(:needs_migration?)
           expect(ActiveRecord::QueryRecorder.new { described_class.current_application_settings }.count).to eq(0)
         end
       end
@@ -109,7 +109,7 @@ describe Gitlab::CurrentSettings do
 
         context 'with pending migrations' do
           before do
-            expect(ActiveRecord::Migrator).to receive(:needs_migration?).and_return(true)
+            expect_any_instance_of(ActiveRecord::MigrationContext).to receive(:needs_migration?).and_return(true)
           end
 
           shared_examples 'a non-persisted ApplicationSetting object' do
diff --git a/spec/lib/gitlab/email/handler/create_issue_handler_spec.rb b/spec/lib/gitlab/email/handler/create_issue_handler_spec.rb
index 48139c2f9dc..7833b9f387d 100644
--- a/spec/lib/gitlab/email/handler/create_issue_handler_spec.rb
+++ b/spec/lib/gitlab/email/handler/create_issue_handler_spec.rb
@@ -105,6 +105,7 @@ describe Gitlab::Email::Handler::CreateIssueHandler do
     context "when the issue could not be saved" do
       before do
         allow_any_instance_of(Issue).to receive(:persisted?).and_return(false)
+        allow_any_instance_of(Issue).to receive(:ensure_metrics).and_return(nil)
       end
 
       it "raises an InvalidIssueError" do
diff --git a/spec/migrations/active_record/schema_spec.rb b/spec/migrations/active_record/schema_spec.rb
index fbf5d387d0e..bc246f88685 100644
--- a/spec/migrations/active_record/schema_spec.rb
+++ b/spec/migrations/active_record/schema_spec.rb
@@ -15,7 +15,7 @@ describe ActiveRecord::Schema do
   it '> schema version equals last migration timestamp' do
     defined_schema_version = File.open(Rails.root.join('db', 'schema.rb')) do |file|
       file.find { |line| line =~ /ActiveRecord::Schema.define/ }
-    end.match(/(\d+)/)[0].to_i
+    end.match(/(\d{4}_\d{2}_\d{2}_\d{6})/)[0].to_i
 
     expect(defined_schema_version).to eq(latest_migration_timestamp)
   end
diff --git a/spec/models/cycle_analytics/issue_spec.rb b/spec/models/cycle_analytics/issue_spec.rb
index 7b18e24a351..4ccbdf29df6 100644
--- a/spec/models/cycle_analytics/issue_spec.rb
+++ b/spec/models/cycle_analytics/issue_spec.rb
@@ -24,7 +24,7 @@ describe 'CycleAnalytics#issue' do
                             ["list label added to issue",
                              -> (context, data) do
                                if data[:issue].persisted?
-                                 data[:issue].update(label_ids: [context.create(:label, lists: [context.create(:list)]).id])
+                                 data[:issue].update(label_ids: [context.create(:list).label_id])
                                end
                              end]],
     post_fn: -> (context, data) do
diff --git a/spec/models/cycle_analytics/plan_spec.rb b/spec/models/cycle_analytics/plan_spec.rb
index 73fc98ba6cf..c99c38e9cf3 100644
--- a/spec/models/cycle_analytics/plan_spec.rb
+++ b/spec/models/cycle_analytics/plan_spec.rb
@@ -25,7 +25,7 @@ describe 'CycleAnalytics#plan' do
                              end],
                             ["list label added to issue",
                              -> (context, data) do
-                               data[:issue].update(label_ids: [context.create(:label, lists: [context.create(:list)]).id])
+                               data[:issue].update(label_ids: [context.create(:list).label_id])
                              end]],
     end_time_conditions:   [["issue mentioned in a commit",
                              -> (context, data) do
diff --git a/spec/models/issue/metrics_spec.rb b/spec/models/issue/metrics_spec.rb
index 07858fe8a70..7aa0d97b194 100644
--- a/spec/models/issue/metrics_spec.rb
+++ b/spec/models/issue/metrics_spec.rb
@@ -32,7 +32,7 @@ describe Issue::Metrics do
 
     context "list labels" do
       it "records the first time an issue is associated with a list label" do
-        list_label = create(:label, lists: [create(:list)])
+        list_label = create(:list).label
         time = Time.now
         Timecop.freeze(time) { subject.update(label_ids: [list_label.id]) }
         metrics = subject.metrics
@@ -43,9 +43,9 @@ describe Issue::Metrics do
 
       it "does not record the second time an issue is associated with a list label" do
         time = Time.now
-        first_list_label = create(:label, lists: [create(:list)])
+        first_list_label = create(:list).label
         Timecop.freeze(time) { subject.update(label_ids: [first_list_label.id]) }
-        second_list_label = create(:label, lists: [create(:list)])
+        second_list_label = create(:list).label
         Timecop.freeze(time + 5.hours) { subject.update(label_ids: [second_list_label.id]) }
         metrics = subject.metrics
 
diff --git a/spec/services/notification_service_spec.rb b/spec/services/notification_service_spec.rb
index 1d7bf91fda1..3e3de051732 100644
--- a/spec/services/notification_service_spec.rb
+++ b/spec/services/notification_service_spec.rb
@@ -1844,7 +1844,7 @@ describe NotificationService, :mailer do
 
   describe 'ProjectMember' do
     let(:project) { create(:project) }
-    set(:added_user) { create(:user) }
+    let(:added_user) { create(:user) }
 
     describe '#new_access_request' do
       context 'for a project in a user namespace' do
diff --git a/spec/support/helpers/migrations_helpers.rb b/spec/support/helpers/migrations_helpers.rb
index cc1a28cb264..272b24f7541 100644
--- a/spec/support/helpers/migrations_helpers.rb
+++ b/spec/support/helpers/migrations_helpers.rb
@@ -18,8 +18,12 @@ module MigrationsHelpers
     ActiveRecord::Migrator.migrations_paths
   end
 
+  def migration_context
+    ActiveRecord::MigrationContext.new(migrations_paths)
+  end
+
   def migrations
-    ActiveRecord::Migrator.migrations(migrations_paths)
+    migration_context.migrations
   end
 
   def clear_schema_cache!
@@ -96,8 +100,7 @@ module MigrationsHelpers
 
   def schema_migrate_down!
     disable_migrations_output do
-      ActiveRecord::Migrator.migrate(migrations_paths,
-                                     migration_schema_version)
+      migration_context.down(migration_schema_version)
     end
 
     reset_column_in_all_models
@@ -107,7 +110,7 @@ module MigrationsHelpers
     reset_column_in_all_models
 
     disable_migrations_output do
-      ActiveRecord::Migrator.migrate(migrations_paths)
+      migration_context.up
     end
 
     reset_column_in_all_models
@@ -123,7 +126,7 @@ module MigrationsHelpers
   end
 
   def migrate!
-    ActiveRecord::Migrator.up(migrations_paths) do |migration|
+    migration_context.up do |migration|
       migration.name == described_class.name
     end
   end
diff --git a/spec/views/notify/pipeline_failed_email.html.haml_spec.rb b/spec/views/notify/pipeline_failed_email.html.haml_spec.rb
index 623237b111a..bf633a118ca 100644
--- a/spec/views/notify/pipeline_failed_email.html.haml_spec.rb
+++ b/spec/views/notify/pipeline_failed_email.html.haml_spec.rb
@@ -28,7 +28,7 @@ describe 'notify/pipeline_failed_email.html.haml' do
 
       expect(rendered).to have_content "Your pipeline has failed"
       expect(rendered).to have_content pipeline.project.name
-      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub!(/\s+/, ' ')
+      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub(/\s+/, ' ')
       expect(rendered).to have_content pipeline.commit.author_name
       expect(rendered).to have_content "##{pipeline.id}"
       expect(rendered).to have_content pipeline.user.name
@@ -45,7 +45,7 @@ describe 'notify/pipeline_failed_email.html.haml' do
 
       expect(rendered).to have_content "Your pipeline has failed"
       expect(rendered).to have_content pipeline.project.name
-      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub!(/\s+/, ' ')
+      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub(/\s+/, ' ')
       expect(rendered).to have_content pipeline.commit.author_name
       expect(rendered).to have_content "##{pipeline.id}"
       expect(rendered).to have_content "by API"
diff --git a/spec/views/notify/pipeline_failed_email.text.erb_spec.rb b/spec/views/notify/pipeline_failed_email.text.erb_spec.rb
index 81245239eba..060274eb56a 100644
--- a/spec/views/notify/pipeline_failed_email.text.erb_spec.rb
+++ b/spec/views/notify/pipeline_failed_email.text.erb_spec.rb
@@ -30,7 +30,7 @@ describe 'notify/pipeline_failed_email.text.erb' do
 
     expect(rendered).to have_content('Your pipeline has failed')
     expect(rendered).to have_content(pipeline.project.name)
-    expect(rendered).to have_content(pipeline.git_commit_message.truncate(50).gsub!(/\s+/, ' '))
+    expect(rendered).to have_content(pipeline.git_commit_message.truncate(50).gsub(/\s+/, ' '))
     expect(rendered).to have_content(pipeline.commit.author_name)
     expect(rendered).to have_content("##{pipeline.id}")
     expect(rendered).to have_content(pipeline.user.name)
diff --git a/spec/views/notify/pipeline_success_email.html.haml_spec.rb b/spec/views/notify/pipeline_success_email.html.haml_spec.rb
index a876bf13e11..46a6c908863 100644
--- a/spec/views/notify/pipeline_success_email.html.haml_spec.rb
+++ b/spec/views/notify/pipeline_success_email.html.haml_spec.rb
@@ -28,7 +28,7 @@ describe 'notify/pipeline_success_email.html.haml' do
 
       expect(rendered).to have_content "Your pipeline has passed"
       expect(rendered).to have_content pipeline.project.name
-      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub!(/\s+/, ' ')
+      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub(/\s+/, ' ')
       expect(rendered).to have_content pipeline.commit.author_name
       expect(rendered).to have_content "##{pipeline.id}"
       expect(rendered).to have_content pipeline.user.name
@@ -45,7 +45,7 @@ describe 'notify/pipeline_success_email.html.haml' do
 
       expect(rendered).to have_content "Your pipeline has passed"
       expect(rendered).to have_content pipeline.project.name
-      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub!(/\s+/, ' ')
+      expect(rendered).to have_content pipeline.git_commit_message.truncate(50).gsub(/\s+/, ' ')
       expect(rendered).to have_content pipeline.commit.author_name
       expect(rendered).to have_content "##{pipeline.id}"
       expect(rendered).to have_content "by API"