Django - ModelForm Dynamic field update

Question

I\'m trying to update certain fields a ModelForm, these fields are not fixed. (I have only tutor that is autopopulated by the view)

Model:

Answer 1

You can invoke form's constructor like this:

class SessionForm(forms.ModelForm):
    class Meta:
        model = Session
        exclude = ['tutor', 'start_time']

    def __init__(self, your_extra_args, *args, **kwargs):
        super(SessionForm, self).__init__(*args, **kwargs)
        if need_end_time_start_time(your_extra_args):
            self.fields['start_time'] = forms.DateTimeField()     

To use this class, you have to pass an argument "your_extra_args" to your form:

session_form = SessionForm('foo')