django: forms foreign key auto corellation

Question

I have to models (demographic + diagnosis) and I've created 2 corresponding forms for these.

models.py

class demographic(models.Model):
    national_health_care_pat_id = models.IntegerField('National Health Care patient id', null=True,blank=True)
    patient_hospital_file_number = models.IntegerField(null=True,blank=True)
    patient_id = models.IntegerField(unique= True ,primary_key=True)

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

class diagnosis(models.Model):
    patient = models.ForeignKey(demographic)
    age_of_diagnosis = models.IntegerField(null=True,blank=True)

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

views.py

def input(request):

form = DemographicForm(request.POST or None)
form_diag = DiagnosisForm(request.POST or None)


context = RequestContext(request)

if form.is_valid():
    save_it = form.save(commit=False)
    save_it.save()
    return render_to_response('test.html')

if form_diag.is_valid():
    save_itd = form_diag.save(commit=False)
    save_itd.save()
    return render_to_response('test.html')

return render_to_response('input.html', {'frm':form, 'frm_d': form_diag}, context)

In my template input.html I have

<form class="tab-pane fade in active" id="demographics" method="post" >
    {%crispy frm%}
</form>
<form class="tab-pane fade" id="diagnosis" method="post">
    {%crispy frm_d%}
</form>

forms.py

class DemographicForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(DemographicForm, self).__init__(*args, **kwargs)
        self.helper=FormHelper(self)
        self.fields['date_of_birth'].widget = widgets.AdminDateWidget()
        self.helper.layout = Layout(
            'national_health_care_pat_id',
            'patient_hospital_file_number',
            'patient_id',

            FormActions(
                Submit('submit', "Save changes"),
                Submit('cancel', "Cancel")
            ),

        )
        self.helper.form_tag = False
        self.helper.form_show_labels = True

    class Meta:
        model = demographic
        exclude = []

class DiagnosisForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(DiagnosisForm, self).__init__(*args, **kwargs)
        self.helper=FormHelper(self)
        self.helper.layout = Layout(
            'patient',
            'age_of_diagnosis',

            FormActions(
                Submit('submit', "Save changes"),
               Submit('cancel',"Cancel")
            ),
        )
        self.helper.form_tag = False
        self.helper.form_show_labels = True

    class Meta:
        model = diagnosis
        exclude = []

Is there a way to correlate the demographic.patient_id with diagnosis.patient on the forms? I mean I fill and save the demographic form and next I fill the diagnosis form I want my form to have the demographic.patient_id value in diagnosis.patient without selecting it.

My head hurts just looking at that code. This isn't related to what you're asking, but wouldn't it make more sense to split things up a bit? Just for readability sake (and also maintainability and maybe extended behavior). You already have a few fields named `foo_fieldname`, so why not make a `Foo` class with those fields and link them instead of having one gigantic model with a million fields? — yuvi, Oct 21 '14 at 13:38
@yuvi Yes, I'm really sorry! I did it. Regarding your last question, that's not in my responsibilities. I have to give a solution to this problem. — zinon, Oct 21 '14 at 13:47
Well, for starters, you probably want to merge the two forms into one, then logic your way into saving the `patient`, and using the newly created object when saving the second one. — yuvi, Oct 21 '14 at 13:55
wait a minute - `tab-pane`? Are you by any chance looking for a way to implement a step-by-step type of form, commonly known as a [Form Wizard](https://docs.djangoproject.com/en/1.4/ref/contrib/formtools/form-wizard/)? Also see my [answer here](http://stackoverflow.com/questions/19471344/how-to-implement-this-in-django-back-button-keep-data-in-request/19471481#19471481) — yuvi, Oct 21 '14 at 14:00
@yuvi No, I do not want to implement formWizard. `tab-pane` is used for bootstrap template — zinon, Oct 21 '14 at 14:13

score 1 · Accepted Answer · edited May 23 '17 at 11:49

1

If you want an initial value you can try this:

form = MyForm(initial={'max_number': '3'})

You would need to replace the 3 by your patient id, which you need to figure how to pass it to the view. It is easy if you are trying something like:

my_demographic_object = my_demographic_form.save() #Object created from your old form
form = MyForm(initial={'patient': my_demographic_object.id})

If that is not what you are trying to do please explain a little more in detail

edited May 23 '17 at 11:49

Community

1
1

answered Oct 21 '14 at 13:55

cdvv7788

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Thanks. When I use `form = MyForm(initial={'patient': my_demographic.id})` I get `'DemographicForm' object has no attribute 'id'` – zinon Oct 21 '14 at 14:24
You are using the form object, not the demographic object. Editing for clarity. – cdvv7788 Oct 21 '14 at 14:27
`my_demographics = DemographicForm(request.POST or None)` and next after the `my_demographics.save()` I have `mydiagnosis= DiagnosisForm(initial={'patient': my_demographics.patient_id})`. Isn't that ok? – zinon Oct 21 '14 at 14:31
I edited my answer. I am getting a reference to the demographics object from the my_demographics.save() line – cdvv7788 Oct 21 '14 at 14:32

django: forms foreign key auto corellation

1 Answers1