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# frozen_string_literal: true
class ScheduleMergeTopicsWithSameName < Gitlab::Database::Migration[1.0]
MIGRATION = 'MergeTopicsWithSameName'
BATCH_SIZE = 100
disable_ddl_transaction!
class Topic < ActiveRecord::Base
self.table_name = 'topics'
end
def up
Topic.select('LOWER(name) as name').group('LOWER(name)').having('COUNT(*) > 1').order('LOWER(name)')
.in_groups_of(BATCH_SIZE, false).each_with_index do |group, i|
migrate_in((i + 1) * 2.minutes, MIGRATION, [group.map(&:name)])
end
end
def down
# no-op
end
end
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