Django form validation logic helpers

forms.py

from models import *
from django import forms
from django.forms.util import ErrorList

class PatientAdminForm(forms.ModelForm):
    
    class Meta:
        model = Patient
    
    def require_fields(self, *fields):
        "Mark field/s as required if empty.  Return True if all are valid."
        is_valid=True
        for field in fields:
            if not self.cleaned_data[field]:
                self._errors[field] = ErrorList(['Required field'])
                is_valid=False
        return is_valid
        
    def clean(self):
        if not self.cleaned_data['nursing_home']:
            if not self.require_fields('street','suburb','postcode'):
                raise forms.ValidationError('Please complete residential address details for day patients')
        else:
            if not self.require_fields('date_of_admission','wing','room'):
                raise forms.ValidationError('Please complete nursing-home details admitted patients')
        return self.cleaned_data