How do I achieve the following elegantly with Web2py?

Before I update an in memory record I want to check it's validators to make 
sure it makes sense before I actually update.

I.e.

client = db.client(7)

if not client:
  raise HTTP(404)

errors = client.validate(**vars)  <== Something like this.

if errors:
   raise HTTP(422) 

client.update_record(**vars)


Is that something that's possible with the current framework or could we 
have it added as it would be extremely useful.

I noticed there seems to be a private def _validate in the dal that could 
be exposed for this purpose.

Interested to hear your thoughts.

Thanks in advance,
Matt


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