Display auth.User fields in related model - django

Question

I have created this Django model:
class Teacher(models.Model):
user = models.OneToOneField('auth.User', on_delete=models.CASCADE, default=1)
surname = models.CharField(max_length=15, null=True)
creation_date = models.DateTimeField('creation date', auto_now_add=True)
deletion_date = models.DateTimeField('deletion date', null=True, blank=True)
and a form to represent it in read-only mode:
class TeacherViewForm(ModelForm):
def __init__(self, *args, **kwargs):
super(TeacherViewForm, self).__init__(*args, **kwargs)
instance = getattr(self, 'instance', None)
if instance and instance.pk:
for field in self.fields:
self.fields[field].widget.attrs['disabled'] = True
class Meta:
model = Teacher
exclude = ['deletion_date']
The view looks like this:
class TeacherViewDetail(generic.DetailView):
model = Teacher
template_name = 'control/teacher_detail.html'
form_class = TeacherViewForm
def get_form(self):
# Instantiate the form
form = self.form_class(instance=self.object)
return form
def get_context_data(self, **kwargs):
context = super(TeacherViewDetail, self).get_context_data(**kwargs)
context.update({
'form': self.get_form(),
})
return context
As you can see, there is a OneToOne relation between the Teacher and the auth.User models. I need to displayfirst_name and last_name from auth.User model, but only the username is shown.
How can I display these fields the same way field Teacher.surname is being displayed?
Do I have to include them in the model, the form.fields or is there a property I have to modify in order to achieve it?
Thanks

Answer 1

You would have to remove the user field and add the appropriate fields instead. Then in your form's __init__, fill the initial values:
# forms.py
class TeacherViewForm(ModelForm):
first_name = forms.CharField()
last_name = forms.CharField()
def __init__(self, *args, **kwargs):
super(TeacherViewForm, self).__init__(*args, **kwargs)
instance = getattr(self, 'instance', None)
if instance and instance.pk:
for field in self.fields:
self.fields[field].widget.attrs['disabled'] = True
# set initial values
self.fields['first_name'].initial = instance.user.first_name
self.fields['last_name'].initial = instance.user.last_name
class Meta:
model = Teacher
exclude = ['user', 'deletion_date'] # exclude user
But why do you use a form at all if you disable all fields? You can just render all this information much more freely in the template.