"Mike Hansen" <[EMAIL PROTECTED]> wrote
> I've got a web form with a lot of form fields. I'd like to be able
> to map
> the form fields to an object's attributes. I'm having a little
> trouble
> figuring out how.
John has answered that bit.
> There will be some fields I'll need to validate(boolean or int), but
> the
> majority are just text fields that can be passed to the object.
One thing you can do is store the validation functions in the
dictionary with the value.
def intValidator(i):
try: return int(i)
except: return None
def boolValidator(b):
try: return b and True or False
except: return None
mapping = { 'field': (intvalue, intValidator),
'another': (boolvalue,boolValidator)...}
You can then access the validator like so:
value = mapping[fieldname][0]
validator = mapping[fieldname][1]
value = validator(value)
if value == None: #ooops!
or more concisely:
value = mapping[fieldname][1](mapping[fieldname]0])
This style of validation has the "benefit" (or side-effect if you
prefer)
of converting compatible types into true types. eg. validating a
string
or float representation of an integer returns the actual integer
value.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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