discourse/db/migrate/20131114185225_add_participant_count_to_topics.rb

# 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
DEV: enable frozen string literal on all files This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging 2019-05-03 06:17:27 +08:00			`# frozen_string_literal: true`

Fix all the errors to get our tests green on Rails 5.1. 2017-08-31 12:06:56 +08:00			`class AddParticipantCountToTopics < ActiveRecord::Migration[4.2]`
Support for tracking the count of unique participants in a topic 2013-11-15 03:32:41 +08:00			`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`