Re: Writing a validator to look for cookie data

Thanks for the tip.

Any idea why Any() doesn't seem to run in my code when no value exists?

Matt

On Thu, Mar 12, 2009 at 2:18 PM, Ian Bicking <[email protected]> wrote:
> For something like this, I usually handle this stuff with unencoded
> values.  That is, I don't hit the validator at all when rendering the
> form.  I'd just get the defaults like:
>
> if req.method == 'POST':
>    defaults = req.POST.mixed()
>    force_defaults = True
> else:
>    defaults = {}
>    force_defaults = False
> defaults.update(cgi.parse_qs(req.cookies.get('form_defaults', '')))
> defaults.update(req.GET.mixed())
> body = htmlfill.render(form, defaults, force_defaults=force_defaults)
>
> If you want to use a validator, I'd use it on the line "defaults={}",
> and replace that with something that grabs the encoded values from
> some existing model, then runs "defaults =
> schema.from_python(values)".
>
> On Thu, Mar 12, 2009 at 12:39 PM, Matthew Wilson <[email protected]> wrote:
>> I store fields from form submissions into a cookie, and then when a
>> user hits a form, I prepopulate the form with that data.
>>
>> I want to write a validator that first tries to get values from the
>> query string, and if that is None, then the validator should check the
>> cookie.
>>
>> Here is what I have:
>>
>> class LookInCookie(FancyValidator):
>>    """
>>    Retrieves something from the cookie.  Depends on a state with an
>>    attribute named 'simple_cookie'.
>>    """
>>
>>    def __init__(self, k, d=None):
>>        """
>>        Return k from the cookie, or d if it isn't there.
>>        """
>>        self.k, self.d = k, d
>>
>>    def to_python(self, value, state=None):
>>
>>        log.debug("Inside LookInCookie.to_python with locals: %s"
>>            % locals())
>>
>>        if hasattr(state, 'simple_cookie') \
>>        and state.simple_cookie.has_key(self.k):
>>
>>            return state.simple_cookie[self.k]
>>
>>        else:
>>            return self.d
>>
>> Then I tried to combine this validator with Any() like this:
>>
>>>>> from turbogears.util import Bunch
>>>>> s = Bunch(simple_cookie={'city':1})
>>>>> v = Any(LookInCookie('city'), validators.Int())
>>>>> v.to_python('99', s)
>> 99
>>>>> v.to_python('abc', s)
>> 1
>>
>> So far, so good!  First, the Int validator runs, then when Int fails,
>> I get the value from the cookie s.
>>
>> However, here's where things fall apart.  When there is no value
>> passed in, nothing comes back out!
>>
>>>>> v.to_python('', s)
>>>>> v.to_python(None, s)
>>
>>
>> How do I force validators to run even when the value is missing?
>>
>> More generally, is there a better solution to what I'm trying to do?
>>
>> --
>> Matthew Wilson
>> [email protected]
>> http://tplus1.com
>>
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>>
>
>
>
> --
> Ian Bicking  |  http://blog.ianbicking.org
>



-- 
Matthew Wilson
[email protected]
http://tplus1.com

------------------------------------------------------------------------------
Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com