adding initial value to Django model form

Question

I just want to add an initial value to one field when it gets populated, this is my view

def add_program(request):
    module = Module.objects.all()
    last_item = Programme.objects.filter(module_id__in=module).last()
    if last_item:
        day = last_item.day + 1
    else:
        day = 1
    initial_data = {
        'day': day
    }
    if request.method == 'POST':
        form = ProgramAddForm(request.POST or None, request.FILES or None, initial=initial_data)
        if form.is_valid():
            instance = form.save(commit=False)
            instance.save()
            return redirect('program_add')
    else:
        form = ProgramAddForm()
    return render(request, 'client_apps/program/form.html', {'form': form})

and form

class ProgramAddForm(forms.ModelForm):

    class Meta:
        model = Programme
        fields = ['module', 'day', .........]

even though initial value is passed nothing is visible in day field when form populates, is there any alternative method?

willeM_ Van Onsem · Accepted Answer · 2020-10-26 00:03:02Z

2

That is because you only use it in case of the POST request, not the GET request:

def add_program(request):
    module = Module.objects.all()
    last_item = Programme.objects.filter(module_id__in=module).last()
    if last_item:
        day = last_item.day + 1
    else:
        day = 1
    initial_data = {
        'day': day
    }
    if request.method == 'POST':
        form = ProgramAddForm(request.POST, request.FILES, initial=initial_data)
        if form.is_valid():
            instance = form.save()
            return redirect('program_add')
    else:
        form = ProgramAddForm(initial=initial_data)  # ← initial data for a GET request
    return render(request, 'client_apps/program/form.html', {'form': form})

answered Oct 26, 2020 at 0:03

willeM_ Van Onsem

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4 Comments

bmons Over a year ago

may I ask, how it can be done with class based views?

willeM_ Van Onsem Over a year ago

@bmons: you override the get_initial method (docs.djangoproject.com/en/3.1/ref/class-based-views/…) and return a dictionary in that method that thus maps keys to values like you do in the function-based view here.

AnonymousUser Over a year ago

I didn't do anything for me. I have a OneToOneField.

AnonymousUser Over a year ago

I used a Class Based View, but now when I changed to a Function Based View it works.

josue · Accepted Answer · 2020-10-26 02:31:04Z

0

you can add it in the init method

class ProgramAddForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(YoutubeModelForm, self).__init__(*args, **kwargs)
        self.fields["day"].value = "day"
        self.fields["day"].initial = "day"
        self.fields["day"].initial = "padding-top: 0;"

        class Meta:
             model = Programme

this to load in the form and in the admin of django

answered Oct 26, 2020 at 2:31

josue

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