discourse/db/migrate/20131114185225_add_particip...

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# frozen_string_literal: true
class AddParticipantCountToTopics < ActiveRecord::Migration[4.2]
def up
add_column :topics, :participant_count, :integer, default: 1
execute "UPDATE topics SET participant_count =
(SELECT COUNT(DISTINCT p.user_id) FROM posts AS p WHERE p.topic_id = topics.id)"
end
def down
remove_column :topics, :participant_count
end
end