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# frozen_string_literal: true
class MigrateEpicMentionsToDb < ActiveRecord::Migration[5.2]
DOWNTIME = false
disable_ddl_transaction!
DELAY = 2.minutes.to_i
BATCH_SIZE = 10000
MIGRATION = 'UserMentions::CreateResourceUserMention'
JOIN = "LEFT JOIN epic_user_mentions on epics.id = epic_user_mentions.epic_id"
QUERY_CONDITIONS = "(description like '%@%' OR title like '%@%') AND epic_user_mentions.epic_id is null"
class Epic < ActiveRecord::Base
include EachBatch
self.table_name = 'epics'
end
def up
return unless Gitlab.ee?
Epic
.joins(JOIN)
.where(QUERY_CONDITIONS)
.each_batch(of: BATCH_SIZE) do |batch, index|
range = batch.pluck(Arel.sql('MIN(epics.id)'), Arel.sql('MAX(epics.id)')).first
BackgroundMigrationWorker.perform_in(index * DELAY, MIGRATION, ['Epic', JOIN, QUERY_CONDITIONS, false, *range])
end
end
def down
# no-op
end
end
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