Merge branch 'switch-rails-ee' into 'master'

[EE] Switch to Rails 5 See merge request gitlab-org/gitlab-ee!7222

Merge branch 'switch-rails-ee' into 'master'
[EE] Switch to Rails 5 See merge request gitlab-org/gitlab-ee!7222
9fe715c5 · Sean McGivern · c75ae20e · 53270429 · 9fe715c5 · 9fe715c5
Commit 9fe715c5 authored Nov 14, 2018 by Sean McGivern
24 changed files
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -106,15 +106,15 @@ stages:

 # END EE-only service helpers

-.rails5: &rails5
-  allow_failure: true
-  only:
+.rails4: &rails4
+  allow_failure: false
+  except:
    variables:
-      - $CI_COMMIT_REF_NAME =~ /rails5/
-      - $RAILS5_ENABLED
+      - $CI_COMMIT_REF_NAME =~ /norails4/
+      - $RAILS5_DISABLED
  variables:
-    BUNDLE_GEMFILE: "Gemfile.rails5"
-    RAILS5: "true"
+    BUNDLE_GEMFILE: "Gemfile.rails4"
+    RAILS5: "false"

 # Skip all jobs except the ones that begin with 'docs/'.
 # Used for commits including ONLY documentation changes.
@@ -208,17 +208,17 @@ stages:
  <<: *rspec-metadata
  <<: *use-pg

-.rspec-metadata-pg-rails5: &rspec-metadata-pg-rails5
+.rspec-metadata-pg-rails4: &rspec-metadata-pg-rails4
  <<: *rspec-metadata-pg
-  <<: *rails5
+  <<: *rails4

 .rspec-metadata-mysql: &rspec-metadata-mysql
  <<: *rspec-metadata
  <<: *use-mysql

-.rspec-metadata-mysql-rails5: &rspec-metadata-mysql-rails5
+.rspec-metadata-mysql-rails4: &rspec-metadata-mysql-rails4
  <<: *rspec-metadata-mysql
-  <<: *rails5
+  <<: *rails4

 .rspec-metadata-ee: &rspec-metadata-ee
  <<: *rspec-metadata
@@ -262,21 +262,21 @@ stages:
    - scripts/gitaly-test-spawn
    - bundle exec rspec --color --format documentation --format RspecJunitFormatter --out junit_rspec.xml --tag geo ee/spec/

-.rspec-ee-pg-rails5: &rspec-ee-pg-rails5
+.rspec-ee-pg-rails4: &rspec-ee-pg-rails4
  <<: *rspec-ee-pg
-  <<: *rails5
+  <<: *rails4

-.rspec-ee-mysql-rails5: &rspec-ee-mysql-rails5
+.rspec-ee-mysql-rails4: &rspec-ee-mysql-rails4
  <<: *rspec-ee-mysql
-  <<: *rails5
+  <<: *rails4

-.rspec-geo-pg-9-6-rails5: &rspec-metadata-pg-geo-9-6-rails5
+.rspec-geo-pg-9-6-rails4: &rspec-metadata-pg-geo-9-6-rails4
  <<: *rspec-metadata-pg-geo-9-6
-  <<: *rails5
+  <<: *rails4

-.rspec-geo-pg-10-2-rails5: &rspec-metadata-pg-geo-10-2-rails5
+.rspec-geo-pg-10-2-rails4: &rspec-metadata-pg-geo-10-2-rails4
  <<: *rspec-metadata-pg-geo-10-2
-  <<: *rails5
+  <<: *rails4

 .only-canonical-masters: &only-canonical-masters
  only:
@@ -566,7 +566,7 @@ setup-test-env:
  script:
    - bundle exec ruby -Ispec -e 'require "spec_helper" ; TestEnv.init'
    - scripts/gitaly-test-build # Do not use 'bundle exec' here
-    - BUNDLE_GEMFILE=Gemfile.rails5 bundle install $BUNDLE_INSTALL_FLAGS
+    - BUNDLE_GEMFILE=Gemfile.rails4 bundle install $BUNDLE_INSTALL_FLAGS
  artifacts:
    expire_in: 7d
    paths:
@@ -610,18 +610,18 @@ rspec-mysql-ee 3 4: *rspec-ee-mysql
 rspec-pg geo 0 1: *rspec-metadata-pg-geo-9-6
 rspec-pg-10 geo 0 1: *rspec-metadata-pg-geo-10-2

-rspec-pg-ee-rails5 0 4: *rspec-ee-pg-rails5
-rspec-pg-ee-rails5 1 4: *rspec-ee-pg-rails5
-rspec-pg-ee-rails5 2 4: *rspec-ee-pg-rails5
-rspec-pg-ee-rails5 3 4: *rspec-ee-pg-rails5
+rspec-pg-ee-rails4 0 4: *rspec-ee-pg-rails4
+rspec-pg-ee-rails4 1 4: *rspec-ee-pg-rails4
+rspec-pg-ee-rails4 2 4: *rspec-ee-pg-rails4
+rspec-pg-ee-rails4 3 4: *rspec-ee-pg-rails4

-rspec-mysql-ee-rails5 0 4: *rspec-ee-mysql-rails5
-rspec-mysql-ee-rails5 1 4: *rspec-ee-mysql-rails5
-rspec-mysql-ee-rails5 2 4: *rspec-ee-mysql-rails5
-rspec-mysql-ee-rails5 3 4: *rspec-ee-mysql-rails5
+rspec-mysql-ee-rails4 0 4: *rspec-ee-mysql-rails4
+rspec-mysql-ee-rails4 1 4: *rspec-ee-mysql-rails4
+rspec-mysql-ee-rails4 2 4: *rspec-ee-mysql-rails4
+rspec-mysql-ee-rails4 3 4: *rspec-ee-mysql-rails4

-rspec-pg-geo-rails5 0 1: *rspec-metadata-pg-geo-9-6-rails5
-rspec-pg-10-geo-rails5 0 1: *rspec-metadata-pg-geo-10-2-rails5
+rspec-pg-geo-rails4 0 1: *rspec-metadata-pg-geo-9-6-rails4
+rspec-pg-10-geo-rails4 0 1: *rspec-metadata-pg-geo-10-2-rails4
 ## EE jobs

 rspec-pg 0 30: *rspec-metadata-pg
@@ -686,67 +686,67 @@ rspec-mysql 27 30: *rspec-metadata-mysql
 rspec-mysql 28 30: *rspec-metadata-mysql
 rspec-mysql 29 30: *rspec-metadata-mysql

-rspec-pg-rails5 0 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 1 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 2 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 3 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 4 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 5 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 6 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 7 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 8 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 9 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 10 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 11 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 12 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 13 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 14 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 15 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 16 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 17 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 18 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 19 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 20 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 21 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 22 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 23 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 24 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 25 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 26 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 27 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 28 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 29 30: *rspec-metadata-pg-rails5
-
-rspec-mysql-rails5 0 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 1 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 2 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 3 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 4 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 5 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 6 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 7 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 8 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 9 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 10 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 11 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 12 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 13 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 14 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 15 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 16 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 17 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 18 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 19 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 20 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 21 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 22 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 23 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 24 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 25 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 26 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 27 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 28 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 29 30: *rspec-metadata-mysql-rails5
+rspec-pg-rails4 0 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 1 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 2 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 3 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 4 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 5 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 6 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 7 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 8 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 9 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 10 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 11 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 12 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 13 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 14 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 15 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 16 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 17 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 18 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 19 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 20 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 21 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 22 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 23 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 24 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 25 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 26 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 27 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 28 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 29 30: *rspec-metadata-pg-rails4
+
+rspec-mysql-rails4 0 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 1 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 2 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 3 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 4 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 5 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 6 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 7 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 8 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 9 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 10 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 11 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 12 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 13 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 14 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 15 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 16 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 17 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 18 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 19 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 20 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 21 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 22 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 23 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 24 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 25 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 26 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 27 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 28 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 29 30: *rspec-metadata-mysql-rails4

 static-analysis:
  <<: *dedicated-no-docs-no-db-pull-cache-job
@@ -794,11 +794,11 @@ downtime_check:
    - /(^docs[\/-].*|.*-docs$)/
    - /(^qa[\/-].*|.*-qa$)/

-rails5_gemfile_lock_check:
+rails4_gemfile_lock_check:
  <<: *dedicated-no-docs-no-db-pull-cache-job
  <<: *except-docs-and-qa
  script:
-    - scripts/rails5-gemfile-lock-check
+    - scripts/rails4-gemfile-lock-check

 ee_compat_check:
  <<: *rake-exec

--- a/Gemfile
+++ b/Gemfile
 # --- Special code for migrating to Rails 5.0 ---
 def rails5?
-  %w[1 true].include?(ENV["RAILS5"])
+  !%w[0 false].include?(ENV["RAILS5"])
 end

 gem_versions = {}

--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,41 +4,44 @@ GEM
    RedCloth (4.3.2)
    abstract_type (0.0.7)
    ace-rails-ap (4.1.2)
-    actionmailer (4.2.10)
-      actionpack (= 4.2.10)
-      actionview (= 4.2.10)
-      activejob (= 4.2.10)
+    actioncable (5.0.7)
+      actionpack (= 5.0.7)
+      nio4r (>= 1.2, < 3.0)
+      websocket-driver (~> 0.6.1)
+    actionmailer (5.0.7)
+      actionpack (= 5.0.7)
+      actionview (= 5.0.7)
+      activejob (= 5.0.7)
      mail (~> 2.5, >= 2.5.4)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
-    actionpack (4.2.10)
-      actionview (= 4.2.10)
-      activesupport (= 4.2.10)
-      rack (~> 1.6)
-      rack-test (~> 0.6.2)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.0.7)
+      actionview (= 5.0.7)
+      activesupport (= 5.0.7)
+      rack (~> 2.0)
+      rack-test (~> 0.6.3)
+      rails-dom-testing (~> 2.0)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (4.2.10)
-      activesupport (= 4.2.10)
+    actionview (5.0.7)
+      activesupport (= 5.0.7)
      builder (~> 3.1)
      erubis (~> 2.7.0)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-dom-testing (~> 2.0)
      rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (4.2.10)
-      activesupport (= 4.2.10)
-      globalid (>= 0.3.0)
-    activemodel (4.2.10)
-      activesupport (= 4.2.10)
-      builder (~> 3.1)
-    activerecord (4.2.10)
-      activemodel (= 4.2.10)
-      activesupport (= 4.2.10)
-      arel (~> 6.0)
-    activerecord_sane_schema_dumper (0.2)
-      rails (>= 4, < 5)
-    activesupport (4.2.10)
-      i18n (~> 0.7)
+    activejob (5.0.7)
+      activesupport (= 5.0.7)
+      globalid (>= 0.3.6)
+    activemodel (5.0.7)
+      activesupport (= 5.0.7)
+    activerecord (5.0.7)
+      activemodel (= 5.0.7)
+      activesupport (= 5.0.7)
+      arel (~> 7.0)
+    activerecord_sane_schema_dumper (1.0)
+      rails (>= 5, < 6)
+    activesupport (5.0.7)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    acts-as-taggable-on (5.0.0)
      activerecord (>= 4.2.8)
@@ -49,7 +52,7 @@ GEM
      public_suffix (>= 2.0.2, < 4.0)
    aes_key_wrap (1.0.1)
    akismet (2.0.0)
-    arel (6.0.4)
+    arel (7.1.4)
    asana (0.6.0)
      faraday (~> 0.9)
      faraday_middleware (~> 0.9)
@@ -151,8 +154,8 @@ GEM
      html-pipeline
    declarative (0.0.10)
    declarative-option (0.1.0)
-    default_value_for (3.0.2)
-      activerecord (>= 3.2.0, < 5.1)
+    default_value_for (3.0.5)
+      activerecord (>= 3.2.0, < 5.2)
    descendants_tracker (0.0.4)
      thread_safe (~> 0.3, >= 0.3.1)
    device_detector (1.0.0)
@@ -403,7 +406,7 @@ GEM
      json (~> 1.8)
      multi_xml (>= 0.5.2)
    httpclient (2.8.3)
-    i18n (0.9.5)
+    i18n (1.1.0)
      concurrent-ruby (~> 1.0)
    icalendar (2.4.1)
    ice_nine (0.11.2)
@@ -499,6 +502,7 @@ GEM
    net-ntp (2.1.3)
    net-ssh (5.0.1)
    netrc (0.11.0)
+    nio4r (2.3.1)
    nokogiri (1.8.4)
      mini_portile2 (~> 2.3.0)
    nokogumbo (1.5.0)
@@ -627,7 +631,7 @@ GEM
      get_process_mem (~> 0.2)
      puma (>= 2.7, < 4)
    pyu-ruby-sasl (0.0.3.3)
-    rack (1.6.11)
+    rack (2.0.5)
    rack-accept (0.4.5)
      rack (>= 0.4)
    rack-attack (4.4.1)
@@ -645,31 +649,36 @@ GEM
      rack
    rack-test (0.6.3)
      rack (>= 1.0)
-    rails (4.2.10)
-      actionmailer (= 4.2.10)
-      actionpack (= 4.2.10)
-      actionview (= 4.2.10)
-      activejob (= 4.2.10)
-      activemodel (= 4.2.10)
-      activerecord (= 4.2.10)
-      activesupport (= 4.2.10)
-      bundler (>= 1.3.0, < 2.0)
-      railties (= 4.2.10)
-      sprockets-rails
+    rails (5.0.7)
+      actioncable (= 5.0.7)
+      actionmailer (= 5.0.7)
+      actionpack (= 5.0.7)
+      actionview (= 5.0.7)
+      activejob (= 5.0.7)
+      activemodel (= 5.0.7)
+      activerecord (= 5.0.7)
+      activesupport (= 5.0.7)
+      bundler (>= 1.3.0)
+      railties (= 5.0.7)
+      sprockets-rails (>= 2.0.0)
+    rails-controller-testing (1.0.2)
+      actionpack (~> 5.x, >= 5.0.1)
+      actionview (~> 5.x, >= 5.0.1)
+      activesupport (~> 5.x)
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.9)
-      activesupport (>= 4.2.0, < 5.0)
-      nokogiri (~> 1.6)
-      rails-deprecated_sanitizer (>= 1.0.1)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
    rails-html-sanitizer (1.0.4)
      loofah (~> 2.2, >= 2.2.2)
-    rails-i18n (4.0.9)
-      i18n (~> 0.7)
-      railties (~> 4.0)
-    railties (4.2.10)
-      actionpack (= 4.2.10)
-      activesupport (= 4.2.10)
+    rails-i18n (5.1.1)
+      i18n (>= 0.7, < 2)
+      railties (>= 5.0, < 6)
+    railties (5.0.7)
+      actionpack (= 5.0.7)
+      activesupport (= 5.0.7)
+      method_source
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rainbow (3.0.0)
@@ -760,8 +769,7 @@ GEM
      rspec-core
    rspec-set (0.1.3)
    rspec-support (3.7.1)
-    rspec_junit_formatter (0.2.3)
-      builder (< 4)
+    rspec_junit_formatter (0.4.1)
      rspec-core (>= 2, < 4, != 2.12.0)
    rspec_profiling (0.0.5)
      activerecord
@@ -878,8 +886,6 @@ GEM
    sysexits (1.2.0)
    temple (0.8.0)
    test-prof (0.2.5)
-    test_after_commit (1.1.0)
-      activerecord (>= 3.2)
    text (1.3.1)
    thin (1.7.2)
      daemons (~> 1.0, >= 1.0.9)
@@ -942,6 +948,9 @@ GEM
      hashdiff
    webpack-rails (0.9.11)
      railties (>= 3.2.0)
+    websocket-driver (0.6.5)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.3)
    wikicloth (0.8.1)
      builder
      expression_parser
@@ -957,7 +966,7 @@ PLATFORMS
 DEPENDENCIES
  RedCloth (~> 4.3.2)
  ace-rails-ap (~> 4.1.0)
-  activerecord_sane_schema_dumper (= 0.2)
+  activerecord_sane_schema_dumper (= 1.0)
  acts-as-taggable-on (~> 5.0)
  addressable (~> 2.5.2)
  akismet (~> 2.0)
@@ -992,7 +1001,7 @@ DEPENDENCIES
  creole (~> 0.5.0)
  database_cleaner (~> 1.5.0)
  deckar01-task_list (= 2.0.0)
-  default_value_for (~> 3.0.0)
+  default_value_for (~> 3.0.5)
  device_detector
  devise (~> 4.4)
  devise-two-factor (~> 3.0.0)
@@ -1117,9 +1126,10 @@ DEPENDENCIES
  rack-cors (~> 1.0.0)
  rack-oauth2 (~> 1.2.1)
  rack-proxy (~> 0.6.0)
-  rails (= 4.2.10)
+  rails (= 5.0.7)
+  rails-controller-testing
  rails-deprecated_sanitizer (~> 1.0.3)
-  rails-i18n (~> 4.0.9)
+  rails-i18n (~> 5.1)
  rainbow (~> 3.0)
  raindrops (~> 0.18)
  rblineprof (~> 0.3.6)
@@ -1172,7 +1182,6 @@ DEPENDENCIES
  state_machines-activerecord (~> 0.5.1)
  sys-filesystem (~> 1.1.6)
  test-prof (~> 0.2.5)
-  test_after_commit (~> 1.1)
  thin (~> 1.7.0)
  timecop (~> 0.8.0)
  toml-rb (~> 1.0.0)

--- a/Gemfile.rails4
+++ b/Gemfile.rails4
+# BUNDLE_GEMFILE=Gemfile.rails4 bundle install
+
+ENV["RAILS5"] = "false"
+
+gemfile = File.expand_path("../Gemfile", __FILE__)
+
+eval(File.read(gemfile), nil, gemfile)
--- a/Gemfile.rails5.lock
+++ b/Gemfile.rails5.lock
@@ -4,44 +4,41 @@ GEM
    RedCloth (4.3.2)
    abstract_type (0.0.7)
    ace-rails-ap (4.1.2)
-    actioncable (5.0.7)
-      actionpack (= 5.0.7)
-      nio4r (>= 1.2, < 3.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.0.7)
-      actionpack (= 5.0.7)
-      actionview (= 5.0.7)
-      activejob (= 5.0.7)
+    actionmailer (4.2.10)
+      actionpack (= 4.2.10)
+      actionview (= 4.2.10)
+      activejob (= 4.2.10)
      mail (~> 2.5, >= 2.5.4)
-      rails-dom-testing (~> 2.0)
-    actionpack (5.0.7)
-      actionview (= 5.0.7)
-      activesupport (= 5.0.7)
-      rack (~> 2.0)
-      rack-test (~> 0.6.3)
-      rails-dom-testing (~> 2.0)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+    actionpack (4.2.10)
+      actionview (= 4.2.10)
+      activesupport (= 4.2.10)
+      rack (~> 1.6)
+      rack-test (~> 0.6.2)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.0.7)
-      activesupport (= 5.0.7)
+    actionview (4.2.10)
+      activesupport (= 4.2.10)
      builder (~> 3.1)
      erubis (~> 2.7.0)
-      rails-dom-testing (~> 2.0)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.0.7)
-      activesupport (= 5.0.7)
-      globalid (>= 0.3.6)
-    activemodel (5.0.7)
-      activesupport (= 5.0.7)
-    activerecord (5.0.7)
-      activemodel (= 5.0.7)
-      activesupport (= 5.0.7)
-      arel (~> 7.0)
-    activerecord_sane_schema_dumper (1.0)
-      rails (>= 5, < 6)
-    activesupport (5.0.7)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
+    activejob (4.2.10)
+      activesupport (= 4.2.10)
+      globalid (>= 0.3.0)
+    activemodel (4.2.10)
+      activesupport (= 4.2.10)
+      builder (~> 3.1)
+    activerecord (4.2.10)
+      activemodel (= 4.2.10)
+      activesupport (= 4.2.10)
+      arel (~> 6.0)
+    activerecord_sane_schema_dumper (0.2)
+      rails (>= 4, < 5)
+    activesupport (4.2.10)
+      i18n (~> 0.7)
      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    acts-as-taggable-on (5.0.0)
      activerecord (>= 4.2.8)
@@ -52,7 +49,7 @@ GEM
      public_suffix (>= 2.0.2, < 4.0)
    aes_key_wrap (1.0.1)
    akismet (2.0.0)
-    arel (7.1.4)
+    arel (6.0.4)
    asana (0.6.0)
      faraday (~> 0.9)
      faraday_middleware (~> 0.9)
@@ -154,8 +151,8 @@ GEM
      html-pipeline
    declarative (0.0.10)
    declarative-option (0.1.0)
-    default_value_for (3.0.5)
-      activerecord (>= 3.2.0, < 5.2)
+    default_value_for (3.0.2)
+      activerecord (>= 3.2.0, < 5.1)
    descendants_tracker (0.0.4)
      thread_safe (~> 0.3, >= 0.3.1)
    device_detector (1.0.0)
@@ -406,7 +403,7 @@ GEM
      json (~> 1.8)
      multi_xml (>= 0.5.2)
    httpclient (2.8.3)
-    i18n (1.1.0)
+    i18n (0.9.5)
      concurrent-ruby (~> 1.0)
    icalendar (2.4.1)
    ice_nine (0.11.2)
@@ -482,9 +479,9 @@ GEM
    memoizable (0.4.2)
      thread_safe (~> 0.3, >= 0.3.1)
    method_source (0.9.0)
-    mime-types (3.1)
+    mime-types (3.2.2)
      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
+    mime-types-data (3.2018.0812)
    mimemagic (0.3.0)
    mini_magick (4.8.0)
    mini_mime (1.0.1)
@@ -502,7 +499,6 @@ GEM
    net-ntp (2.1.3)
    net-ssh (5.0.1)
    netrc (0.11.0)
-    nio4r (2.3.1)
    nokogiri (1.8.4)
      mini_portile2 (~> 2.3.0)
    nokogumbo (1.5.0)
@@ -631,7 +627,7 @@ GEM
      get_process_mem (~> 0.2)
      puma (>= 2.7, < 4)
    pyu-ruby-sasl (0.0.3.3)
-    rack (2.0.5)
+    rack (1.6.11)
    rack-accept (0.4.5)
      rack (>= 0.4)
    rack-attack (4.4.1)
@@ -649,36 +645,31 @@ GEM
      rack
    rack-test (0.6.3)
      rack (>= 1.0)
-    rails (5.0.7)
-      actioncable (= 5.0.7)
-      actionmailer (= 5.0.7)
-      actionpack (= 5.0.7)
-      actionview (= 5.0.7)
-      activejob (= 5.0.7)
-      activemodel (= 5.0.7)
-      activerecord (= 5.0.7)
-      activesupport (= 5.0.7)
-      bundler (>= 1.3.0)
-      railties (= 5.0.7)
-      sprockets-rails (>= 2.0.0)
-    rails-controller-testing (1.0.2)
-      actionpack (~> 5.x, >= 5.0.1)
-      actionview (~> 5.x, >= 5.0.1)
-      activesupport (~> 5.x)
+    rails (4.2.10)
+      actionmailer (= 4.2.10)
+      actionpack (= 4.2.10)
+      actionview (= 4.2.10)
+      activejob (= 4.2.10)
+      activemodel (= 4.2.10)
+      activerecord (= 4.2.10)
+      activesupport (= 4.2.10)
+      bundler (>= 1.3.0, < 2.0)
+      railties (= 4.2.10)
+      sprockets-rails
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (2.0.3)
-      activesupport (>= 4.2.0)
-      nokogiri (>= 1.6)
+    rails-dom-testing (1.0.9)
+      activesupport (>= 4.2.0, < 5.0)
+      nokogiri (~> 1.6)
+      rails-deprecated_sanitizer (>= 1.0.1)
    rails-html-sanitizer (1.0.4)
      loofah (~> 2.2, >= 2.2.2)
-    rails-i18n (5.1.1)
-      i18n (>= 0.7, < 2)
-      railties (>= 5.0, < 6)
-    railties (5.0.7)
-      actionpack (= 5.0.7)
-      activesupport (= 5.0.7)
-      method_source
+    rails-i18n (4.0.9)
+      i18n (~> 0.7)
+      railties (~> 4.0)
+    railties (4.2.10)
+      actionpack (= 4.2.10)
+      activesupport (= 4.2.10)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rainbow (3.0.0)
@@ -769,7 +760,8 @@ GEM
      rspec-core
    rspec-set (0.1.3)
    rspec-support (3.7.1)
-    rspec_junit_formatter (0.4.1)
+    rspec_junit_formatter (0.2.3)
+      builder (< 4)
      rspec-core (>= 2, < 4, != 2.12.0)
    rspec_profiling (0.0.5)
      activerecord
@@ -886,6 +878,8 @@ GEM
    sysexits (1.2.0)
    temple (0.8.0)
    test-prof (0.2.5)
+    test_after_commit (1.1.0)
+      activerecord (>= 3.2)
    text (1.3.1)
    thin (1.7.2)
      daemons (~> 1.0, >= 1.0.9)
@@ -948,9 +942,6 @@ GEM
      hashdiff
    webpack-rails (0.9.11)
      railties (>= 3.2.0)
-    websocket-driver (0.6.5)
-      websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
    wikicloth (0.8.1)
      builder
      expression_parser
@@ -966,7 +957,7 @@ PLATFORMS
 DEPENDENCIES
  RedCloth (~> 4.3.2)
  ace-rails-ap (~> 4.1.0)
-  activerecord_sane_schema_dumper (= 1.0)
+  activerecord_sane_schema_dumper (= 0.2)
  acts-as-taggable-on (~> 5.0)
  addressable (~> 2.5.2)
  akismet (~> 2.0)
@@ -1001,7 +992,7 @@ DEPENDENCIES
  creole (~> 0.5.0)
  database_cleaner (~> 1.5.0)
  deckar01-task_list (= 2.0.0)
-  default_value_for (~> 3.0.5)
+  default_value_for (~> 3.0.0)
  device_detector
  devise (~> 4.4)
  devise-two-factor (~> 3.0.0)
@@ -1126,10 +1117,9 @@ DEPENDENCIES
  rack-cors (~> 1.0.0)
  rack-oauth2 (~> 1.2.1)
  rack-proxy (~> 0.6.0)
-  rails (= 5.0.7)
-  rails-controller-testing
+  rails (= 4.2.10)
  rails-deprecated_sanitizer (~> 1.0.3)
-  rails-i18n (~> 5.1)
+  rails-i18n (~> 4.0.9)
  rainbow (~> 3.0)
  raindrops (~> 0.18)
  rblineprof (~> 0.3.6)
@@ -1182,6 +1172,7 @@ DEPENDENCIES
  state_machines-activerecord (~> 0.5.1)
  sys-filesystem (~> 1.1.6)
  test-prof (~> 0.2.5)
+  test_after_commit (~> 1.1)
  thin (~> 1.7.0)
  timecop (~> 0.8.0)
  toml-rb (~> 1.0.0)

--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
+# frozen_string_literal: true
+
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end
--- a/bin/rails
+++ b/bin/rails
 #!/usr/bin/env ruby

 # Remove this block when upgraded to rails 5.0.
-unless %w[1 true].include?(ENV["RAILS5"])
+if %w[0 false].include?(ENV["RAILS5"])
  begin
    load File.expand_path('../spring', __FILE__)
  rescue LoadError => e

--- a/bin/rake
+++ b/bin/rake
 #!/usr/bin/env ruby

 # Remove this block when upgraded to rails 5.0.
-unless %w[1 true].include?(ENV["RAILS5"])
+if %w[0 false].include?(ENV["RAILS5"])
  begin
    load File.expand_path('../spring', __FILE__)
  rescue LoadError => e

--- a/bin/rspec
+++ b/bin/rspec
@@ -2,7 +2,7 @@

 # Remove these two lines below when upgraded to rails 5.0.
 # Allow run `rspec` command as `RAILS5=1 rspec ...` instead of `BUNDLE_GEMFILE=Gemfile.rails5 rspec ...`
-gemfile = %w[1 true].include?(ENV["RAILS5"]) ? "Gemfile.rails5" : "Gemfile"
+gemfile = %w[0 false].include?(ENV["RAILS5"]) ? "Gemfile.rails4" : "Gemfile"
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../#{gemfile}", __dir__)

 begin

--- a/bin/setup
+++ b/bin/setup
 #!/usr/bin/env ruby

 def rails5?
-  %w[1 true].include?(ENV["RAILS5"])
+  !%w[0 false].include?(ENV["RAILS5"])
 end

 require "pathname"

--- a/changelogs/unreleased/switch-rails.yml
+++ b/changelogs/unreleased/switch-rails.yml
+---
+title: Switch to Rails 5
+merge_request: 21492
+author:
+type: other
--- a/config/application.rb
+++ b/config/application.rb
@@ -10,7 +10,7 @@ module Gitlab
  # This method is used for smooth upgrading from the current Rails 4.x to Rails 5.0.
  # https://gitlab.com/gitlab-org/gitlab-ce/issues/14286
  def self.rails5?
-    ENV["RAILS5"].in?(%w[1 true])
+    !%w[0 false].include?(ENV["RAILS5"])
  end

  class Application < Rails::Application

--- a/config/boot.rb
+++ b/config/boot.rb
 def rails5?
-  %w[1 true].include?(ENV["RAILS5"])
+  !%w[0 false].include?(ENV["RAILS5"])
 end

 require 'rubygems' unless rails5?

-gemfile = rails5? ? "Gemfile.rails5" : "Gemfile"
+gemfile = rails5? ? "Gemfile" : "Gemfile.rails4"
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../#{gemfile}", __dir__)

 # Set up gems listed in the Gemfile.

--- a/config/environment.rb
+++ b/config/environment.rb
 # Load the rails application

 # Remove this condition when upgraded to rails 5.0.
-if %w[1 true].include?(ENV["RAILS5"])
-  require_relative 'application'
-else
+if %w[0 false].include?(ENV["RAILS5"])
  require File.expand_path('application', __dir__)
+else
+  require_relative 'application'
 end

 # Initialize the rails application

--- a/config/initializers/mysql_set_length_for_binary_indexes.rb
+++ b/config/initializers/mysql_set_length_for_binary_indexes.rb
@@ -24,28 +24,46 @@ if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
  ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:prepend, MysqlSetLengthForBinaryIndex)
 end

-if Gitlab.rails5?
-  module MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema
-    # This method is used in Rails 5 schema loading as t.index
-    def index(column_names, options = {})
-      options[:length] ||= {}
-      Array(column_names).each do |column_name|
-        column = columns.find { |c| c.name == column_name }
-
-        if column&.type == :binary
-          options[:length][column_name] = 20
-        end
-      end
+module MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema
+  # This method is used in Rails 5 schema loading as t.index
+  def index(column_names, options = {})
+    # Ignore indexes that use opclasses,
+    # also see config/initializers/mysql_ignore_postgresql_options.rb
+    if options[:opclasses]
+      warn "WARNING: index on columns #{column_names} uses unsupported option, skipping."
+      return
+    end
+
+    # when running rails 4 with rails 5 schema, rails 4 doesn't support multiple
+    # indexes on the same set of columns. Mysql doesn't support partial indexes, so if
+    # an index already exists and we add another index, skip it if it's partial:
+    # see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21492#note_102821326
+    if !Gitlab.rails5? && indexes[column_names] && options[:where]
+      warn "WARNING: index on columns #{column_names} already exists and partial index is not supported, skipping."
+      return
+    end
+
+    options[:length] ||= {}
+    Array(column_names).each do |column_name|
+      column = columns.find { |c| c.name == column_name }

-      # Ignore indexes that use opclasses,
-      # also see config/initializers/mysql_ignore_postgresql_options.rb
-      unless options[:opclasses]
-        super(column_names, options)
+      if column&.type == :binary
+        options[:length][column_name] = 20
      end
    end
+
+    super(column_names, options)
  end
+end

+def mysql_adapter?
+  defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter) && ActiveRecord::Base.connection.is_a?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
+end
+
+if Gitlab.rails5?
  if defined?(ActiveRecord::ConnectionAdapters::MySQL::TableDefinition)
    ActiveRecord::ConnectionAdapters::MySQL::TableDefinition.send(:prepend, MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema)
  end
+elsif mysql_adapter? && defined?(ActiveRecord::ConnectionAdapters::TableDefinition)
+  ActiveRecord::ConnectionAdapters::TableDefinition.send(:prepend, MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema)
 end
--- a/db/schema.rb
+++ b/db/schema.rb
--- a/doc/development/README.md
+++ b/doc/development/README.md
@@ -54,6 +54,7 @@ description: 'Learn how to contribute to GitLab.'
 - [Guidelines for reusing abstractions](reusing_abstractions.md)
 - [DeclarativePolicy framework](policies.md)
 - [Geo development](geo.md)
+- [Switching to Rails 5](switching_to_rails5.md)

 ## Performance guides


--- a/doc/development/switching_to_rails5.md
+++ b/doc/development/switching_to_rails5.md
+# Switching to Rails 5
+
+GitLab switched recently to Rails 5. This is a big change (especially for backend development) and it introduces couple of temporary inconveniences.
+
+## After the switch, I found a broken feature. What do I do?
+
+Many fixes and tweaks were done to make our codebase compatible with Rails 5, but it's possible that not all issues were found. If you find an bug, please create an issue and assign it the ~rails5 label.
+
+## It takes much longer to run CI pipelines that build GitLab. Why?
+
+We are temporarily running CI pipelines with Rails 4 and 5 so that we ensure we remain compatible with Rails 4 in case we must revert back to Rails 4 from Rails 5 (this can double the duration of CI pipelines).
+
+We might revert back to Rails 4 if we found a major issue we were unable to quickly fix.
+
+Once we are sure we can stay with Rails 5, we will stop running CI pipelines with Rails 4.
+
+## Can I skip running Rails 4 tests?
+
+If you are sure that your merge request doesn't introduce any incompatibility, you can just include `norails4` anywhere in your branch name and Rails 4 tests will be skipped.
+
+## CI is failing on my test with Rails 4. How can I debug it?
+
+You can run specs locally with Rails 4 using the following command:
+
+```sh
+BUNDLE_GEMFILE=Gemfile.rails4 RAILS5=0 bundle exec rspec ...
+```
--- a/ee/db/geo/schema.rb
+++ b/ee/db/geo/schema.rb
-# encoding: UTF-8
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
@@ -16,41 +15,39 @@ ActiveRecord::Schema.define(version: 20180806020615) do
  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

-  create_table "event_log_states", primary_key: "event_id", force: :cascade do |t|
+  create_table "event_log_states", primary_key: "event_id", id: :bigint, force: :cascade do |t|
  end

  create_table "file_registry", force: :cascade do |t|
    t.string "file_type", null: false
    t.integer "file_id", null: false
-    t.integer "bytes", limit: 8
+    t.bigint "bytes"
    t.string "sha256"
    t.datetime "created_at", null: false
    t.boolean "success", default: false, null: false
    t.integer "retry_count"
    t.datetime "retry_at"
    t.boolean "missing_on_primary", default: false, null: false
+    t.index ["file_type", "file_id"], name: "index_file_registry_on_file_type_and_file_id", unique: true, using: :btree
+    t.index ["file_type"], name: "index_file_registry_on_file_type", using: :btree
+    t.index ["retry_at"], name: "index_file_registry_on_retry_at", using: :btree
+    t.index ["success"], name: "index_file_registry_on_success", using: :btree
  end

-  add_index "file_registry", ["file_type", "file_id"], name: "index_file_registry_on_file_type_and_file_id", unique: true, using: :btree
-  add_index "file_registry", ["file_type"], name: "index_file_registry_on_file_type", using: :btree
-  add_index "file_registry", ["retry_at"], name: "index_file_registry_on_retry_at", using: :btree
-  add_index "file_registry", ["success"], name: "index_file_registry_on_success", using: :btree
-
  create_table "job_artifact_registry", force: :cascade do |t|
    t.datetime_with_timezone "created_at"
    t.datetime_with_timezone "retry_at"
-    t.integer "bytes", limit: 8
+    t.bigint "bytes"
    t.integer "artifact_id"
    t.integer "retry_count"
    t.boolean "success"
    t.string "sha256"
    t.boolean "missing_on_primary", default: false, null: false
+    t.index ["artifact_id"], name: "index_job_artifact_registry_on_artifact_id", using: :btree
+    t.index ["retry_at"], name: "index_job_artifact_registry_on_retry_at", using: :btree
+    t.index ["success"], name: "index_job_artifact_registry_on_success", using: :btree
  end

-  add_index "job_artifact_registry", ["artifact_id"], name: "index_job_artifact_registry_on_artifact_id", using: :btree
-  add_index "job_artifact_registry", ["retry_at"], name: "index_job_artifact_registry_on_retry_at", using: :btree
-  add_index "job_artifact_registry", ["success"], name: "index_job_artifact_registry_on_success", using: :btree
-
  create_table "project_registry", force: :cascade do |t|
    t.integer "project_id", null: false
    t.datetime "last_repository_synced_at"
@@ -82,26 +79,24 @@ ActiveRecord::Schema.define(version: 20180806020615) do
    t.boolean "wiki_missing_on_primary"
    t.integer "repository_verification_retry_count"
    t.integer "wiki_verification_retry_count"
+    t.index ["last_repository_successful_sync_at"], name: "idx_project_registry_synced_repositories_partial", where: "((resync_repository = false) AND (repository_retry_count IS NULL) AND (repository_verification_checksum_sha IS NOT NULL))", using: :btree
+    t.index ["last_repository_successful_sync_at"], name: "index_project_registry_on_last_repository_successful_sync_at", using: :btree
+    t.index ["last_repository_synced_at"], name: "index_project_registry_on_last_repository_synced_at", using: :btree
+    t.index ["project_id"], name: "idx_project_registry_on_repo_checksums_and_failure_partial", where: "((repository_verification_checksum_sha IS NULL) AND (last_repository_verification_failure IS NULL))", using: :btree
+    t.index ["project_id"], name: "idx_project_registry_on_repository_failure_partial", where: "(last_repository_verification_failure IS NOT NULL)", using: :btree
+    t.index ["project_id"], name: "idx_project_registry_on_wiki_checksums_and_failure_partial", where: "((wiki_verification_checksum_sha IS NULL) AND (last_wiki_verification_failure IS NULL))", using: :btree
+    t.index ["project_id"], name: "idx_project_registry_on_wiki_failure_partial", where: "(last_wiki_verification_failure IS NOT NULL)", using: :btree
+    t.index ["project_id"], name: "idx_repository_checksum_mismatch", where: "(repository_checksum_mismatch = true)", using: :btree
+    t.index ["project_id"], name: "idx_wiki_checksum_mismatch", where: "(wiki_checksum_mismatch = true)", using: :btree
+    t.index ["project_id"], name: "index_project_registry_on_project_id", unique: true, using: :btree
+    t.index ["repository_retry_at"], name: "index_project_registry_on_repository_retry_at", using: :btree
+    t.index ["repository_retry_count"], name: "idx_project_registry_failed_repositories_partial", where: "((repository_retry_count > 0) OR (last_repository_verification_failure IS NOT NULL) OR repository_checksum_mismatch)", using: :btree
+    t.index ["repository_retry_count"], name: "idx_project_registry_pending_repositories_partial", where: "((repository_retry_count IS NULL) AND (last_repository_successful_sync_at IS NOT NULL) AND ((resync_repository = true) OR ((repository_verification_checksum_sha IS NULL) AND (last_repository_verification_failure IS NULL))))", using: :btree
+    t.index ["repository_verification_checksum_sha"], name: "idx_project_registry_on_repository_checksum_sha_partial", where: "(repository_verification_checksum_sha IS NULL)", using: :btree
+    t.index ["resync_repository"], name: "index_project_registry_on_resync_repository", using: :btree
+    t.index ["resync_wiki"], name: "index_project_registry_on_resync_wiki", using: :btree
+    t.index ["wiki_retry_at"], name: "index_project_registry_on_wiki_retry_at", using: :btree
+    t.index ["wiki_verification_checksum_sha"], name: "idx_project_registry_on_wiki_checksum_sha_partial", where: "(wiki_verification_checksum_sha IS NULL)", using: :btree
  end

-  add_index "project_registry", ["last_repository_successful_sync_at"], name: "idx_project_registry_synced_repositories_partial", where: "((resync_repository = false) AND (repository_retry_count IS NULL) AND (repository_verification_checksum_sha IS NOT NULL))", using: :btree
-  add_index "project_registry", ["last_repository_successful_sync_at"], name: "idx_unsynced_repositories_partial", where: "(last_repository_successful_sync_at IS NULL)", using: :btree
-  add_index "project_registry", ["last_repository_successful_sync_at"], name: "index_project_registry_on_last_repository_successful_sync_at", using: :btree
-  add_index "project_registry", ["last_repository_synced_at"], name: "index_project_registry_on_last_repository_synced_at", using: :btree
-  add_index "project_registry", ["project_id"], name: "idx_project_registry_on_repo_checksums_and_failure_partial", where: "((repository_verification_checksum_sha IS NULL) AND (last_repository_verification_failure IS NULL))", using: :btree
-  add_index "project_registry", ["project_id"], name: "idx_project_registry_on_repository_failure_partial", where: "(last_repository_verification_failure IS NOT NULL)", using: :btree
-  add_index "project_registry", ["project_id"], name: "idx_project_registry_on_wiki_checksums_and_failure_partial", where: "((wiki_verification_checksum_sha IS NULL) AND (last_wiki_verification_failure IS NULL))", using: :btree
-  add_index "project_registry", ["project_id"], name: "idx_project_registry_on_wiki_failure_partial", where: "(last_wiki_verification_failure IS NOT NULL)", using: :btree
-  add_index "project_registry", ["project_id"], name: "idx_repository_checksum_mismatch", where: "(repository_checksum_mismatch = true)", using: :btree
-  add_index "project_registry", ["project_id"], name: "idx_wiki_checksum_mismatch", where: "(wiki_checksum_mismatch = true)", using: :btree
-  add_index "project_registry", ["project_id"], name: "index_project_registry_on_project_id", unique: true, using: :btree
-  add_index "project_registry", ["repository_retry_at"], name: "index_project_registry_on_repository_retry_at", using: :btree
-  add_index "project_registry", ["repository_retry_count"], name: "idx_project_registry_failed_repositories_partial", where: "((repository_retry_count > 0) OR (last_repository_verification_failure IS NOT NULL) OR repository_checksum_mismatch)", using: :btree
-  add_index "project_registry", ["repository_retry_count"], name: "idx_project_registry_pending_repositories_partial", where: "((repository_retry_count IS NULL) AND (last_repository_successful_sync_at IS NOT NULL) AND ((resync_repository = true) OR ((repository_verification_checksum_sha IS NULL) AND (last_repository_verification_failure IS NULL))))", using: :btree
-  add_index "project_registry", ["repository_verification_checksum_sha"], name: "idx_project_registry_on_repository_checksum_sha_partial", where: "(repository_verification_checksum_sha IS NULL)", using: :btree
-  add_index "project_registry", ["resync_repository"], name: "index_project_registry_on_resync_repository", using: :btree
-  add_index "project_registry", ["resync_wiki"], name: "index_project_registry_on_resync_wiki", using: :btree
-  add_index "project_registry", ["wiki_retry_at"], name: "index_project_registry_on_wiki_retry_at", using: :btree
-  add_index "project_registry", ["wiki_verification_checksum_sha"], name: "idx_project_registry_on_wiki_checksum_sha_partial", where: "(wiki_verification_checksum_sha IS NULL)", using: :btree
-
 end
--- a/scripts/rails4-gemfile-lock-check
+++ b/scripts/rails4-gemfile-lock-check
+#!/usr/bin/env bash
+
+echo -e "=> Checking if Gemfile.rails4.lock is up-to-date...\\n"
+
+cp Gemfile.rails4.lock Gemfile.rails4.lock.orig
+BUNDLE_GEMFILE=Gemfile.rails4 bundle install "$BUNDLE_INSTALL_FLAGS"
+diff -u Gemfile.rails4.lock.orig Gemfile.rails4.lock >/dev/null 2>&1
+
+if [ $? == 1 ]
+then
+  diff -u Gemfile.rails4.lock.orig Gemfile.rails4.lock
+
+  echo -e "\\n✖ ERROR: Gemfile.rails4.lock is not up-to-date!
+         Please run 'BUNDLE_GEMFILE=Gemfile.rails4 bundle install'\\n" >&2
+  exit 1
+fi
+
+echo "✔ Gemfile.rails4.lock is up-to-date"
+exit 0
--- a/scripts/rails5-gemfile-lock-check
+++ b/scripts/rails5-gemfile-lock-check
-#!/usr/bin/env bash
-
-echo -e "=> Checking if Gemfile.rails5.lock is up-to-date...\\n"
-
-cp Gemfile.rails5.lock Gemfile.rails5.lock.orig
-BUNDLE_GEMFILE=Gemfile.rails5 bundle install "$BUNDLE_INSTALL_FLAGS"
-diff -u Gemfile.rails5.lock.orig Gemfile.rails5.lock >/dev/null 2>&1
-
-if [ $? == 1 ]
-then
-  diff -u Gemfile.rails5.lock.orig Gemfile.rails5.lock
-
-  echo -e "\\n✖ ERROR: Gemfile.rails5.lock is not up-to-date!
-         Please run 'BUNDLE_GEMFILE=Gemfile.rails5 bundle install'\\n" >&2
-  exit 1
-fi
-
-echo "✔ Gemfile.rails5.lock is up-to-date"
-exit 0
--- a/spec/lib/gitlab/database/migration_helpers_spec.rb
+++ b/spec/lib/gitlab/database/migration_helpers_spec.rb
@@ -1338,7 +1338,12 @@ describe Gitlab::Database::MigrationHelpers do
  end

  describe '#index_exists_by_name?' do
-    it 'returns true if an index exists' do
+    # TODO: remove rails5-only after removing rails4 tests
+    # rails 4 can not handle multiple indexes on the same column set if
+    # index was added by 't.index' - t.index is used by default in schema.rb in
+    # rails 5. Let's run this test only in rails 5 env:
+    # see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21492#note_113602758
+    it 'returns true if an index exists', :rails5 do
      expect(model.index_exists_by_name?(:projects, 'index_projects_on_path'))
        .to be_truthy
    end

--- a/spec/lib/gitlab/github_import/importer/pull_request_importer_spec.rb
+++ b/spec/lib/gitlab/github_import/importer/pull_request_importer_spec.rb
@@ -240,7 +240,12 @@ describe Gitlab::GithubImport::Importer::PullRequestImporter, :clean_gitlab_redi
          .and_return(user.id)
      end

-      it 'returns the existing merge request' do
+      # TODO: remove rails5-only after removing rails4 tests
+      # rails 4 can not handle multiple indexes on the same column set if
+      # index was added by 't.index' - t.index is used by default in schema.rb in
+      # rails 5. Let's run this test only in rails 5 env:
+      # see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21492#note_113602758
+      it 'returns the existing merge request', :rails5 do
        mr1, exists1 = importer.create_merge_request
        mr2, exists2 = importer.create_merge_request


--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -237,6 +237,10 @@ RSpec.configure do |config|
    example.run if Gitlab::Database.mysql?
  end

+  config.around(:each, :rails5) do |example|
+    example.run if Gitlab.rails5?
+  end
+
  # This makes sure the `ApplicationController#can?` method is stubbed with the
  # original implementation for all view specs.
  config.before(:each, type: :view) do