Merge branch 'warning-pending-migrations' into 'master'

Raise an error on page load when there are pending migrations in
development mode.

Fixes #5990 

See merge request !2491

.gitlab-ci.yml

@@ -8,7 +8,7 @@ before_script:
   - touch log/application.log
   - touch log/test.log
   - bundle install --without postgres production --jobs $(nproc)  "${FLAGS[@]}"
-  - bundle exec rake db:reset db:create RAILS_ENV=test
+  - RAILS_ENV=test bundle exec rake db:drop db:create db:schema:load db:migrate
 spec:feature:
   script:
@@ -118,7 +118,7 @@ flay:
     - mysql
 bundler:audit:
-  script: 
+  script:
     - "bundle exec bundle-audit update"
     - "bundle exec bundle-audit check"
   tags:

config/environments/development.rb

@@ -16,6 +16,9 @@ Rails.application.configure do
   # Print deprecation notices to the Rails logger
   config.active_support.deprecation = :log
+  # Raise an error on page load if there are pending migrations
+  config.active_record.migration_error = :page_load
+
   # Only use best-standards-support built into browsers
   config.action_dispatch.best_standards_support = :builtin

lib/gitlab/current_settings.rb

@@ -39,7 +39,6 @@ module Gitlab
                end
       use_db && ActiveRecord::Base.connection.active? &&
-                !ActiveRecord::Migrator.needs_migration? &&
                 ActiveRecord::Base.connection.table_exists?('application_settings')
     rescue ActiveRecord::NoDatabaseError