Share validators between Records and forms

[zerocrates]

Zend_Form has nice ways of showing validation errors on a per-field basis, so we use that pretty often.

At the same time, we need to keep the validators that run within a record to keep developers from manually saving invalid records.

It would be nice, and should be possible, to define validators within the Record in such a way that it's easy to bulk-apply them to an Omeka_Form instance so we don't have to specify a bunch of validators twice where we have a form that lets you set basically every piece of data for a record.

[jeremyboggs]

Would be great to share the error messages for each validator too.

[zerocrates]

@clioweb That would be #47, I believe.

[jeremyboggs]

@clioweb That would be #47, I believe.

That seems to just cover duplicate messages among different forms. I meant sharing messages between the form and the record.

[zerocrates]

Ah.

I think this would involve instantiating the validator classes in just one place. That would mean the messages would only be defined once, too.