SELECT * FROM `categories_description_old` WHERE ((`categories_description` = '') OR (`categories_name` = '') OR (`categories_heading_title` = ''))

我的(丑)解决方案：

conditions = [:categories_name,:categories_heading_title,:categories_description]
b = table_categories_description_old.filter(conditions.pop => "")
conditions.each do |m|
 b = b.or(m => "")
end

有没有更好的解决方案来链接或条件？