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# frozen_string_literal: true
class MigrateAllMergeRequestUserMentionsToDb < ActiveRecord::Migration[6.0]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
DELAY = 2.minutes.to_i
BATCH_SIZE = 100_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
end
def up
delay = DELAY
MergeRequest.each_batch(of: BATCH_SIZE) do |batch, _|
range = batch.pluck('MIN(merge_requests.id)', 'MAX(merge_requests.id)').first
records_count = MergeRequest.joins(JOIN).where(QUERY_CONDITIONS).where(id: range.first..range.last).count
if records_count > 0
migrate_in(delay, MIGRATION, ['MergeRequest', JOIN, QUERY_CONDITIONS, false, *range])
delay += [DELAY, (records_count / 500 + 1).minutes.to_i].max
end
end
end
def down
# no-op
end
end
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