Re: Passing hidden foreign key to form as initial value

Can somebody explain why did occurs with widget=forms.HiddenInput ?

Thank's.

Em quarta-feira, 31 de março de 2010 10:20:48 UTC-3, Phoebe Bright escreveu:

Displayed fields resolve as expected, hidden fields cause errors.

This works:

in the model
CourseBook has a foreign key to Course

In the view:

course = Course.objects.get(pk=whatever)
form = CouseBook(initial = {'course': course})

in the Form:

class CourseBook(ModelForm):
    class Meta:
        model = CourseBooking

The web page now displays a picklist of courses with the initial value
highlighted.  I can now do a form.save() no problem.

However, if I make the course a hidden field, which is what I want.

class CourseBook(ModelForm):
    course = forms.CharField(widget=forms.HiddenInput())

    class Meta:
        model = CourseBooking

then when I come to save() I get a ValueError, unable to assign "My
course"  etc. as it tries to put the name of the course into the
foreign key instead of a course instance.

I can work around this putting a save method on the form, but it seems
to me django should resolve this for me????

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