discourse/db/migrate/20190325162154_make_site_settings_unique.rb

# frozen_string_literal: true

class MakeSiteSettingsUnique < ActiveRecord::Migration[5.2]
  def up
    execute <<~SQL
      DELETE
      FROM site_settings a USING site_settings b
      WHERE a.id < b.id AND a.name = b.name
    SQL

    add_index :site_settings, [:name], unique: true
  end

  def down
    remove_index :site_settings, [:name]
  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: Remove duplicate site settings and add unique index 2019-03-26 00:30:53 +08:00			`class MakeSiteSettingsUnique < ActiveRecord::Migration[5.2]`
			`def up`
			`execute <<~SQL`
			`DELETE`
			`FROM site_settings a USING site_settings b`
			`WHERE a.id < b.id AND a.name = b.name`
			`SQL`

			`add_index :site_settings, [:name], unique: true`
			`end`

			`def down`
			`remove_index :site_settings, [:name]`
			`end`
			`end`