Rails - Jan 2006 - Validation with AJAX; how to DRY validation?

What are some good ways of doing validation with AJAX in Rails (with 
Prototype/Scriptaculous)? I have some Ajax.InPlaceEditors, and I would 
like the page with the editors on it to display errors if the data given 
is e.g. too short, too long, wrong format...

Ideally, this should be DRY in regard to the validators.

A related question: is there any way of DRY between the database table 
field constraints and validators? That is, can you make your model 
automatically pick up on e.g. maxlength based on the table field''s 
varchar length?

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Try out this plugin I created.... http://railsrtv.rubyforge.org/
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Made an new rails app, then run the ajax scaffold generator. Since it
worked from here I copied over all files from the public/javascript
folder to my old app, and rerun the ajax scaffold generator here, and
now it works.

- henrik