clean() method in model and field validation

Question

I have a problem with a model\'s clean() method and basic field validation. here\'s my model and the clean() method.

class Trial(mo         


        

Answer 1

I guess that's the way to go:

class TrialForm(ModelForm):

    class Meta:
        model = Trial

    def clean(self):

        data = self.cleaned_data
        if not ('movement_start' in data.keys() and 'trial_start' in data.keys()  and 'trial_stop' in data.keys()):
            raise forms.ValidationError("Please fill out missing fields.")

        trial_start = data['trial_start']
        movement_start = data['movement_start']
        trial_stop = data['trial_stop']

        if not (movement_start >= trial_start):
            raise forms.ValidationError('movement start must be >= trial start')

        if not (trial_stop >= movement_start):
            raise forms.ValidationError('trial stop must be >= movement start')

        if not (trial_stop > trial_start):
            raise forms.ValidationError('trial stop must be > trial start')

        return data

EDIT the downside of this approach is, that value checking will only work if I create objects through the form. Objects that are created on the python shell won't be checked.