discourse-follow/db/migrate/20220617173420_enable_follow_if_already_installed.rb

# frozen_string_literal: true

class EnableFollowIfAlreadyInstalled < ActiveRecord::Migration[6.1]
  def up
    follow_installed_at = DB.query_single(<<~SQL)&.first
      SELECT created_at FROM schema_migration_details WHERE version='20210901115010'
    SQL

    if follow_installed_at && follow_installed_at < 1.hour.ago
      # The plugin was installed before we changed it to be disabled-by-default
      # Therefore, if there is no existing database value, enable the plugin
      execute <<~SQL
        INSERT INTO site_settings(name, data_type, value, created_at, updated_at)
        VALUES('discourse_follow_enabled', 5, 't', NOW(), NOW())
        ON CONFLICT (name) DO NOTHING
      SQL
    end
  end

  def down
    # do nothing
  end
end