Polymorphic Associations and Validation

Hi!

I want to validate values from a form. That wouldn't be
very
difficult, but the model I want to polulate is in a
polymorphic
association!
Here are my models:

* Document (created_at, autor, resource_id, resource_type)
   ** Folder (name)
   ** Binary (name, data, content_type)

So a document can be either a folder or a binary. But here
the problem
begins. Folder and Binary both have a
"name"-column (this column is
not in the "documents"-table), so when users
create a folder, they can
enter a name. When they upload a file, the
"name"-column of the
"binaries"-table will be set automatically to the
name of the file the
user has uploaded. That's no problem!
But I want to validate the name for a folder the user
enteres. I have
two seperate forms for folder- and binary-creation, and I
simply want
to validate the presence and the length of a new
folder-name. But
where does the validation go? And how can I display the
error-
messages?
I tried several things, but when I try to enter a folder
without a
name there will be no new record in "folders"
(which is good!) but no
error-message and an entry in the
"documents"-table.
How can I validate those entries and how can I display
error-messages?
And how can I prevent inserting "empty" entries to
the "documents"-
table?

Thanks for any help,
- Dominik


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