> Hobos supporting plain assocs by offering an automagically generated
> dropdown.

I can't think of a decent equivalent for polymorphic menus. I think it  
might be a design mistake if your app needs this. Whenever I've needed  
polymorphic associations I find I want to edit them from the other end.

For example, a couple of common use cases are a generic comment model,  
and tagging. In both cases you add the comment or the tag to the thing  
you want to comment/tag. You don't start with the comment or tag and  
indicate what thing it should belong to.

Do you have a counter example? What kind of an input control would you  
like to see.

> Having a polymorphic associations I get an input box for the type
> field…

You could declare never_show on the field

Tom


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