discourse/db/migrate/20140122043508_add_meta_category.rb

class AddMetaCategory < ActiveRecord::Migration
  def up
    unless Rails.env.test?
      result = Category.exec_sql "SELECT 1 FROM site_settings where name = 'meta_category_id'"
      if result.count == 0
        description = I18n.t('meta_category_description')

        name = I18n.t('meta_category_name')
        if Category.exec_sql("SELECT 1 FROM categories where name ilike '#{name}'").count == 0
          result = execute "INSERT INTO categories
                          (name, color, text_color, created_at, updated_at, user_id, slug, description, read_restricted)
                   VALUES ('#{name}', 'EEEEEE', '652D90', now(), now(), -1, '#{Slug.for(name)}', '#{description}', true)
                   RETURNING id"
          category_id = result[0]["id"].to_i

          execute "INSERT INTO site_settings(name, data_type, value, created_at, updated_at)
                   VALUES ('meta_category_id', 3, #{category_id}, now(), now())"
        end

      end
    end
  end

  def down
    # Don't reverse this change. There is so much logic around deleting a category that it's messy
    # to try to do in sql. The up method will just make sure never to create the category twice.
  end
end