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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class MigrateRemainingIssuesClosedAt < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
class Issue < ActiveRecord::Base
self.table_name = 'issues'
include EachBatch
end
def up
Gitlab::BackgroundMigration.steal('CopyColumn')
Gitlab::BackgroundMigration.steal('CleanupConcurrentTypeChange')
if migrate_column_type?
if closed_at_for_type_change_exists?
migrate_remaining_rows
else
# Due to some EE merge problems some environments may not have the
# "closed_at_for_type_change" column. If this is the case we have no
# other option than to migrate the data _right now_.
change_column_type_concurrently(:issues, :closed_at, :datetime_with_timezone)
cleanup_concurrent_column_type_change(:issues, :closed_at)
end
end
end
def down
# Previous migrations already revert the changes made here.
end
def migrate_remaining_rows
Issue.where('closed_at_for_type_change IS NULL AND closed_at IS NOT NULL').each_batch do |batch|
batch.update_all('closed_at_for_type_change = closed_at')
end
cleanup_concurrent_column_type_change(:issues, :closed_at)
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 # rubocop:disable Migration/Datetime
end
def closed_at_for_type_change_exists?
columns('issues').any? { |col| col.name == 'closed_at_for_type_change' }
end
end
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