2009/11/12 Dirk Uys <dirkc...@gmail.com>:
> On Thu, Nov 12, 2009 at 2:23 PM, rebus_ <r.dav...@gmail.com> wrote:
>
>>
>> You can add custom clean methods in your form:
>>
>> class Event (models.Model):
>> start_date = models.DateField()
>> end_date = models.DateField()
>>
>> def clean(self):
>> start = self.cleaned_data.get('start_date', False)
>> end = self.cleaned_data.get('end_date', False)
>> if not start or not end:
>> raise forms.ValidationError('message')
>> if start > end:
>> raise forms.ValidationError('start is greater then end')
>> return self.cleaned_data
>>
>> This is just an example code.
>>
>> Using this approach validation errors will not be associated with and
>> field.
>> You could write clean_start_date and clean_end_date methods which
>> would evaluate each field and all validation errors would be
>> associated with specific field.
>>
>> To learn more about form validation read [1] or [2]:
>>
>> [1] http://docs.djangoproject.com/en/dev/ref/forms/validation/
>> [2]
>> http://code.djangoproject.com/browser/django/trunk/docs/ref/forms/validation.txt
>>
>
> Thanks! This is actually what I have done. The only problem is that I do not
> always use forms to supply data (sometimes I import from CVS) and would like
> to avoid doing the validation at two different points.
>
> For the time being, I guess this will do
>
> Cheers
> Dirk
>
Technically, i think you should be able iterate over dataset imported
from CVS and bound each data row to form, validate the form and then
use the cleaned_data to create an object of the Model and save it or
whatever. Not sure what performance impacts this would have, if any,
but i guess that would depend on the amount of data that needs
validation.
Take a look at [1] forms API for example.
Also you could factor out the clean code into standalone function for
example and then use that function to validate the given data both in
form and the place you use imported data.
But then again i am no guru on the subject, these are just my opinions.
[1] http://docs.djangoproject.com/en/dev/ref/forms/api/
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