add extra field to ModelForm

Question

I am adding an extra field to a Django ModelForm like that:

class form(forms.ModelForm):
    extra_field = forms.CharField(label='Name of Institution')
    class Meta:
        model = db_institutionInstitution
        fields = ['conn_kind','time','inst_name2']

The form is actually working fine, but I cant prepopulate it. I use it in a modelformset_factory:

formset = modelformset_factory(db_institutionInstitution,form=form)

I manually run through a queryset and add the entry in the dictionary needed for the additional form in the formset. However, when I call:

formset1 = formset(prefix='brch',queryset=qs1)

the extra_field is not prepopulated as intended (the rest is working fine).

Can anyone help?

score 19 · Accepted Answer · edited Jul 06 '20 at 08:42

19

If you want to set a default.

extra_field = forms.CharField(label='Name of Institution', initial="harvard")

If you want to dynamically set a value put it on form initialization:

def __init__(self, *args, **kwargs):
    super(form, self).__init__(*args, **kwargs)
    self.fields['extra_field'].initial = "harvard"

edited Jul 06 '20 at 08:42

Alif Jahan

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answered Jun 10 '15 at 17:33

professorDante

2,290
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"default" should be "initial" – Chris SH Jun 02 '18 at 15:27
`AttributeError: module 'django.forms' has no attribute 'Charfield'`. Anyone knows how this answer will work in django 2.1? – Gonzalo Garcia Apr 23 '19 at 15:58
Has 'CharField' – ruslan_krivoshein Feb 07 '20 at 07:30
if i do this my `form.is_valid()` always return false – shellbot97 May 27 '20 at 07:41

add extra field to ModelForm

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