You may want to take a look at the (from my dodgy memory) req-params
action which does a simple existential check on request parameters.
There's an example of its use in the modular database sample code's sitemap.
Cheers
Simon
Sonny Sukumar wrote:
Hi guys,
I was wondering what the best way is to validate request parameters. I
have a few questions:
1.) What is the best way to validate the *existence* of all expected
request params (both for simple queries and for posting form data)?
By this, I mean I'd ideally like to notify the client if any request
param wasn't sent. I was thinking I could write a dedicated action to
do this validation before another action extracts/formats the values.
2.) Do you think it is even a good practice to take the time/effort/cpu
power to validate that all expected request params were sent and notify
the client if they were not?
Otherwise, my action that extracts/formats the values would just end up
throwing things like NullPointerExceptions, NumberFormatExceptions, etc.
when it tries to extract/format the values. This doesn't seem very
elegant at all to me, even if I do wrap them in ProcessingExceptions
before throwing them.
One other reason I don't want to throw these seemingly odd and random
exceptions is because they'll just give a stack trace that says my code
failed on Line XXX. On my team we have another development group that
is working on buiding the actual XHTML webpages and making sure they
work with the backend. So these sorts of exceptions and stack traces
won't help them at all to figure out what went wrong. If I notify them
they forgot a param, they can say Oh , I forgot to pass the XYZ
param--that's why it's failing and fix their XHTML code in short order.
I'm interested to hear all of your thoughts!
Thanks,
Sonny
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