discourse/db/migrate/20170704142141_add_visible_back_to_groups.rb

class AddVisibleBackToGroups < ActiveRecord::Migration
  def change
    # add the visible column so it is delay dropped this cleans up some deploy issues
    add_column :groups, :visible, :boolean, default: true, null: false
    execute 'UPDATE groups set visible = false where visibility_level > 0'
  end
end