Dear Railers, I recently discovered the acts_as_list feature in Active Record and tried to use it in my app. Unfortunately there are a couple of problems with it. First I looked in the API documentation but there are no explanations. Then I read the chapter in the “Agile Web Dev?…”. It mentions the feature but doesn’t go into details in the chapter “More Active Record”. The API states: “All the methods available to a record that has had acts_as_list specified. Each method works by assuming the object to be the item in the list, so chapter.move_lower would move that chapter lower in the list of all chapters. Likewise, chapter.first? would return true if that chapter is the first in the list of all chapters.” When acts_as_list is used, I found there are two major problems: 1. An inconsistence between chapter list index on object level and the automagic field position in the DB table. position seems to start with 1, where as the list index starts with 0. Mix those two and you get into serious trouble. 2. Lists don’t work as expected when there are objects of different type in it. For example, if you subclass chapter in body and comments and store them in a chapter table, the list moving doesn’t work any more. Also, i’ve got some questions that I couldn’t figure out: 1. How do I add a new element created outside to the list? What happens when I use book.chapter << someChapter ? What position is set? I’d expect it’s added at the end, but it seems to be, that it is not. Is this a good way to add elements to the list or do they have to be create@d in the list context? 2. How can I add an element to a specific position in the list? I suppose to use @insert_at, but how can I specify the element to add? Or do I have to add the element first and then to set it to a specific position? 4. Are there cases where I have to manipulate the position field by myself? Would be very nice if someone could shed some light on those questions. Best regards, Magnus