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# frozen_string_literal: true
class MigrateMergeRequestMentionsToDb < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
DELAY = 3.minutes.to_i
BATCH_SIZE = 1_000
MIGRATION = 'UserMentions::CreateResourceUserMention'
JOIN = "LEFT JOIN merge_request_user_mentions on merge_requests.id = merge_request_user_mentions.merge_request_id"
QUERY_CONDITIONS = "(description like '%@%' OR title like '%@%') AND merge_request_user_mentions.merge_request_id IS NULL"
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
include EachBatch
self.table_name = 'merge_requests'
end
def up
MergeRequest
.joins(JOIN)
.where(QUERY_CONDITIONS)
.each_batch(of: BATCH_SIZE) do |batch, index|
range = batch.pluck(Arel.sql('MIN(merge_requests.id)'), Arel.sql('MAX(merge_requests.id)')).first
migrate_in(index * DELAY, MIGRATION, ['MergeRequest', JOIN, QUERY_CONDITIONS, false, *range])
end
end
def down
# no-op
end
end
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