Formset configuration

Using Django Forms & APIs
1

Hi,

I’m trying to use a Formset_factory form so the user can update multiple records on the same template. But I need that only one field is enabled for update.

I’m getting the data from a classe model only with FK.

What happens is if I use a widget on the field to set it as read-only, the form only displays the IDs but if I don’t run that line on the form I get the name of the student and I can update it.

How can I make the field showning the name and at the same time being read-only?

Here is my code so far:

model class

class Registers(models.Model):

    class Meta:
        verbose_name_plural = 'Registers'

    lesson_at = models.DateTimeField(auto_now_add=True)
    regclasseid = models.ForeignKey(Turmas, on_delete=models.CASCADE, verbose_name="Classe:")
    regalunoid = models.ForeignKey(Alunos, on_delete=models.CASCADE, verbose_name="Aluno:")

    PRESENT_ABSENT = (
        ('P', 'Present'),
        ('A', 'Absent'),
    )

    status = models.CharField(max_length=1, choices=PRESENT_ABSENT, verbose_name="Presence/Absence:")

    def __int__(self):
        return self.regalunoid

form

from django import forms
from .models import Registers


class RegisterForm(forms.ModelForm):
    regalunoid = forms.CharField(widget=forms.TextInput(attrs={'readonly': 'readonly'}))

    class Meta:
        model = Registers
        fields = ["regalunoid", "status"]

view

def RegisterUpdate(request, **kwargs):

    t = Turmas.objects.get(id=kwargs['pk'])

    RegisterFormSet = modelformset_factory(Registers, form=RegisterForm)
    form = RegisterFormSet(queryset=Registers.objects.filter(regclasseid=kwargs['pk']))
    return render(request, 'schooladmin/registers.html', {'form': form, 'turma': t})

Screenshot 2023-11-26 at 16.06.24
Screenshot 2023-11-26 at 16.06.241362×128 15.3 KB

Screenshot 2023-11-26 at 16.07.05

Thanks in advance

2

The issue here is that the Model field regalunoid is a ForeignKey, but you’re trying to render it as a TextInput field.

By default, the ForeignKey field should render as a ModelChoiceField, with the display value being defined by the __str__ method on the target model (Alunos).

I think you can get the result you want by using the ModelChoiceField as the field type, using the select widget with the disabled attribute True.

Note: Do not rely upon the readonly attribute (it’s not relevant to select fields anyway). You want to use the disabled attribute.

3

Thank you, it’s working now!

Two last questions about these forms:

1 - Can we use CSS on them?
2 - How can we get rid off the last empty row?

4

Yes, the same way you would style any form.

See the information about the extra attribute in the docs.

5

Thanks you for your help.