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

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

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