discourse/db/migrate/20191101001705_add_banner_index_to_topics.rb

# frozen_string_literal: true
class AddBannerIndexToTopics < ActiveRecord::Migration[6.0]
  def change
    # this speeds up the process for finding banners on the site
    add_index :topics, [:id], name: 'index_topics_on_id_filtered_banner', where: "archetype = 'banner' AND deleted_at IS NULL", unique: true
  end
end
PERF: add a filtered index for banners This ensures we can very quickly figure out which topics are banners if a banner is set. Previously you would have to scan an entire table to find banners 2019-11-01 08:21:57 +08:00			`# frozen_string_literal: true`
			`class AddBannerIndexToTopics < ActiveRecord::Migration[6.0]`
			`def change`
			`# this speeds up the process for finding banners on the site`
			`add_index :topics, [:id], name: 'index_topics_on_id_filtered_banner', where: "archetype = 'banner' AND deleted_at IS NULL", unique: true`
			`end`
			`end`