Merge branch 'change-issues-closed-at-background-migration' into 'master'

Use a background migration for migrating issues.closed_at

See merge request gitlab-org/gitlab-ce!16083

2 files changed, 46 insertions, 1 deletions

diff --git a/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb b/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb
new file mode 100644
index 00000000000..be18c5866ae
--- /dev/null
+++ b/db/post_migrate/20171221140220_schedule_issues_closed_at_type_change.rb
@@ -0,0 +1,45 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class ScheduleIssuesClosedAtTypeChange < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  class Issue < ActiveRecord::Base
+    self.table_name = 'issues'
+    include EachBatch
+
+    def self.to_migrate
+      where('closed_at IS NOT NULL')
+    end
+  end
+
+  def up
+    return unless migrate_column_type?
+
+    change_column_type_using_background_migration(
+      Issue.to_migrate,
+      :closed_at,
+      :datetime_with_timezone
+    )
+  end
+
+  def down
+    return if migrate_column_type?
+
+    change_column_type_using_background_migration(
+      Issue.to_migrate,
+      :closed_at,
+      :datetime
+    )
+  end
+
+  def migrate_column_type?
+    # Some environments may have already executed the previous version of this
+    # migration, thus we don't need to migrate those environments again.
+    column_for('issues', 'closed_at').type == :datetime
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 9d3b5db117e..925629f28fb 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171220191323) do
+ActiveRecord::Schema.define(version: 20171221140220) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"