Re: DateConverter validator can't parse str(datetime.date) objects

Thanks for the quick response.  I think maybe the problem is that my
web framework (turbogears 1.0) doesn't seem to use from_python to
serialize the data back out.  Instead, it seems to use a str.

I'll start looking around there.

On Sun, Sep 7, 2008 at 12:17 PM, Ian Bicking <[email protected]> wrote:
> Matthew Wilson wrote:
>>
>> I'm using the formencodel.validators.DateConverter class to convert
>> strings collected from an HTML web form into datetime.date objects.
>>
>> On the first page load, I draw the form blank.  Then on the second
>> page, I populate the form with the values passed in.
>>
>> Here's the problem:
>>
>> DateConverter().to_python(...) returns a datetime.date object.  When I
>> convert datetime.date to a string, it renders itself like this into a
>> string that can't be parsed by the DateConverter.
>>
>> This strikes me as really weird.
>>
>> Here's some code that demonstrates my problem:
>>
>>>>> dc = formencode.validators.DateConverter()
>>>>> dc.to_python('09-06-2008') # today
>>
>> datetime.date(2008, 9, 6)
>>>>>
>>>>> today = dc.to_python('09-06-2008')
>>>>> today
>>
>> datetime.date(2008, 9, 6)
>>>>>
>>>>> str(today)
>>
>> '2008-09-06'
>>>>>
>>>>> dc.to_python(str(today))
>
> Validators do round-trips through the two methods to_python and from_python.
>  So dc.to_python(dc.from_python(today)) should work.
>
> What values the DateConverter accepts relates to what values it expects to
> produce.  str() doesn't know about where the value is going to go, so it
> can't be context-sensitive like this.
>
> --
> Ian Bicking : [email protected] : http://blog.ianbicking.org
>



-- 
Matthew Wilson
[email protected]
http://tplus1.com
216-470-6058

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