How to implement row ordering in Rails?

I'm trying to impl开发者_JAVA百科ement a UI feature for a listings page where the user can change the order of the records they have created.

I'd assume one way to do it would be to store a position field with some kind of editable auto-increment rule; The position values of rows could then be swapped as the user raises or the lowers the position. However I'm not quite sure how that would be done, I'm still a Rails newbie.

I should also mention that I am trying to a avoid solutions that tie me to a particular database.

Any suggestions?

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acts_as_list is the standard solution here. You will have a position column in your model that will hold the ordering.

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This is a commment/addition to the accepted answer above.

acts_as_list is not designed for anything beyond a prototype, and out of the box it does not handle concurrency or data integrity at all. At the very least, you must set your isolation level to serializable! Here's a short screen cast with more information, and some workarounds.