How do I add a class attribute to a field on ModelForm

Using Django
1

Hi
So I’m trying to add a class atrribute to this field on my ModelForm to allow for Bootstrap styling:

category = forms.ModelChoiceField(queryset=Category.objects.all())

I tried this:

category = forms.ModelChoiceField(queryset=Category.objects.all(), widget=forms.ModelChoiceField(attrs={'class':'form-control'}))

and got this error:

TypeError: __init__() missing 1 required positional argument: 'queryset'

How do I solve this?

2

You’re getting the error because you’re trying to add forms.ModelChoiceField as a widget into a forms.ModelChoiceField instance. In this case, I think you’re looking for forms.Select or forms.CheckboxInput. From there you should be able to add the widget attribute :slight_smile:

Here’s the documentation as a second resource just in case I’m wrong –

Hope this helps!

3

Thank you Suttonium. I managed to find the answer and this worked for me:

category = forms.ModelChoiceField(queryset=Category.objects.all(),)
category.widget.attrs.update({'class': 'form-control'})

or someone else did say I could try this as well:

category = forms.ModelChoiceField(
        queryset=Category.objects.all(),
        widget=forms.Select(attrs={'class': 'form-control'})
     )

I imagine the code immediately above is along the lines of what you were trying to recommend.

4

You’re correct! The latter choice is what I was referring to. You can also edit the widget attribute in the Meta class on your form (which is what the former choice is referring to, just not in a “django-esque” way). Both are valid options if they work for you :slight_smile: