2009/11/12 Dirk Uys <dirkc...@gmail.com>:
> I have a model with a from and to date:
>
> class Event (models.Model):
> start_date = models.DateField()
> end_date = models.DateField()
>
> In order to ensure start_date is always before end_date i can think of 3
> options:
>
> 1. Use form validation iow in the clean method of an inherited form
> 2. Use the django.db.models.signals.pre_save signal
> 3. Create a custor field that takes an parameter of the date field wich must
> allways be greater than or less than
>
> What is the easiest way to achieve this?
>
> Regards
> Dirk
>
> --
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
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