hi, i have used a relaction has_and_belongs_to_many to implementing a backoffice where the customer settings categories and products: the products can have multiple categories, it selet them with a combobox. Now the problem is the customer ask me needly to choice a category by default: products are indicizated on google, when this links are opening the product must by reporting the default category. how i obtain this with an has_and_belongs_to_many relaction? -- Posted via http://www.ruby-forum.com/.