Limit the choices of a choice field in a form based on a user condition

I'm having a problem with a choice field in Django. I need to have a form to add order movements to a work orders.

These are the choices in choices.py

STATUS_CHOICES = (
    (1, ("Orden Creada")),
    (2, ("En Tienda Asociada")),
    (3, ("Recibida en Cuyotek")),
    (4, ("En Mesa de Trabajo")),
    (5, ("Trabajo completado")),
    (6, ("Sin Solución")),
    (7, ("Lista para retirar en Cuyotek")),
    (8, ("Lista para retirar en Tienda Asociada")),
    (9, ("Es necesario contactar al cliente")),
    (10, ("En espera de Repuestos")),
    (20, ("ENTREGADA")),
)

And I need to limit the choices to show only "8 and 20" if the user is not staff.

This is the model in models.py

class OrderMovements(models.Model):
    fk_workorder = models.ForeignKey(WorkOrder)
    status = models.IntegerField(choices=STATUS_CHOICES, default=1)
    timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)

    def __str__(self):
        return str(self.fk_workorder)

And this the form in forms.py

class AddMovementForm(forms.ModelForm):

    class Meta:
        model = OrderMovements
        fields = ['status']

    def clean_status(self):
        status = self.cleaned_data.get('status')
        return status

I can't find info about how to make this filter.

Thanks for your help!

Solution

You need to define an __init__() method in your form class which takes is_staff as an argument. is_staff can be a boolean value.

def __init__(self, *args, **kwargs):
    is_staff = kwargs.pop('is_staff')
    super(AddMovementForm, self).__init__(*args, **kwargs)
    if is_staff:
        self.fields['status'].choices = STAFF_STATUS_CHOICES
    else:
        self.fields['status'].choices = STATUS_CHOICES

When you initialize your form, you can do

AddMovementForm(is_staff=True)  # or
AddMovementForm(is_staff=False)