This is getting into django-users territory, but I wanted to point out that 
it's often better to leave out the field instead of using a hidden input.

You can then override the form_valid() method, and set the value before the 
form is saved.

    class PatientCreate(LoginRequiredMixin, UserOrgRequiredMixin, CreateView):
        model = models.Patient
        fields = ['name', 'caregiver_name', 'sex', 'birth_date',
                  'residence']


        def form_valid(self, form):

            form.instance.country = get_country()  # e.g. get country from 
self.request.user

            return super().form_valid(form)


Cheers,
Alasdair


On Wednesday, 5 December 2018 16:06:57 UTC, Dan F wrote:
>
> Ah, I see.
>
> It looks like I can use modelform_factory. So:
>
> class PatientCreate(LoginRequiredMixin, UserOrgRequiredMixin, CreateView):
>     model = models.Patient
>     fields = ['name', 'caregiver_name', 'sex', 'birth_date',
>               'residence', 'country']
>
> becomes
>
> from django.forms.models import modelform_factory
>
> _patient_create_form = modelform_factory(
>     models.Patient,
>     fields=['name', 'caregiver_name', 'sex', 'birth_date',
>             'residence', 'country'])
>
> class PatientCreate(LoginRequiredMixin, UserOrgRequiredMixin, CreateView):
>     form_class = _patient_create_form
>     template_name = 'healthdbapp/patient_form.html'
>
> and then I can add the widgets:
>
> from django.forms import HiddenInput
>
> from django.forms.models import modelform_factory
>
> _patient_create_form = modelform_factory(
>     models.Patient,
>     fields=['name', 'caregiver_name', 'sex', 'birth_date',
>             'residence', 'country'],
>     widgets={'country': HiddenInput()})
>
>
> class PatientCreate(LoginRequiredMixin, UserOrgRequiredMixin, CreateView):
>     form_class = _patient_create_form
>     template_name = 'healthdbapp/patient_form.html'
>
>
> Works for me.
>
> On Tue, Dec 4, 2018 at 5:04 PM charettes <chare...@gmail.com <javascript:>> 
> wrote:
>
>> I agree with Tim that this is a slippery slope.
>>
>> Maybe that adding a ModelFormMixin.get_form_class_options() that returns 
>> a
>> {'fields': self.fields} dict by default and is passed to 
>> modelform_factory(**kwargs)
>> in get_form_class() would be a good compromise? 
>>
>> Best,
>> Simon
>>
>> On Tuesday, December 4, 2018 17:28:39 UTC-5, Tim Graham wrote:
>>>
>>> What I meant is that modelform_factory() also has these parameters:
>>>
>>> localized_fields is a list of names of fields which should be localized.
>>>
>>> labels is a dictionary of model field names mapped to a label.
>>>
>>> help_texts is a dictionary of model field names mapped to a help text.
>>>
>>> error_messages is a dictionary of model field names mapped to a 
>>> dictionary of error messages.
>>> field_classes is a dictionary of model field names mapped to a form 
>>> field class. 
>>>
>>> If we accept the patch for widgets, then are we headed down the road of 
>>> adding support for the rest of those arguments? Customizing a form directly 
>>> rather than indirectly via the view seems like better design to me. It 
>>> doesn't require adding features to ModelFormMixin as they are added to 
>>> ModelForm.
>>>
>>> On Tuesday, December 4, 2018 at 4:57:40 PM UTC-5, Dan F wrote:
>>>>
>>>> https://code.djangoproject.com/ticket/24589
>>>>
>>>> This ticket has a patch to pass through the "widgets" argument for 
>>>> generic class-based views.
>>>>
>>>> It was closed with "won't fix" with this comment: "*I don't think the 
>>>> possibility of saving a few lines of user code justifies the complexity of 
>>>> reimplementing the parameters to modelform_factory() as CBV parameters and 
>>>> methods.*"
>>>>
>>>> I don't understand. The patch was quite small (doesn't seem complex), 
>>>> and it could give everyone the ability to overload widgets.
>>>>
>>>> Aside from just saving lines of code, it also would act more as 
>>>> expected. I tried using "widgets" before seeing that it didn't work. Also, 
>>>> it would support not making a new form class where every field just has to 
>>>> be copied (useless boilerplate).
>>>>
>>>> Can you accept the patch?
>>>>
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