Django template keyword `choice_value` in no longer work in 1.11

Question

There is a multiple checkbox in template, if value contain in render the choice will checked by default. It works well with 1.10.

form.py:

class NewForm(forms.Form):
    project = forms.ModelMultipleChoiceField(
        widget=forms.CheckboxSelectMultiple, 
        queryset=Project.objects.filter(enable=True)
    )

template:

{% for p in form.project %}
<label for="{{ p.id_for_label }}">
    <input type="checkbox" name="{{ p.name }}" id="{{ p.id_for_label }}"
        value="{{ p.choice_value }}"
        {% if p.choice_value|add:"0" in form.project.initial %} checked{% endif %}>
    <p>{{ p.choice_label }}</p>
</label>
{% endfor %}

views.py:

def order_start(request, order_id):
    if request.method == 'POST':
        form = NewForm(request.POST)
        if form.is_valid():
            order.end_time = timezone.now()
            order.save()
            order.project = form.cleaned_data['project']
            order.save()
            return HttpResponsec(order.id)
    else:
        form = NewForm(initial={
            'project': [p.pk for p in order.project.all()],
        })

    return render(request, 'orders/start.html', {'form': form, 'order': orderc})

When I upgrade to Django 1.11, {{ p.name }} and {{ p.choice_value }} return nothing. I know 1.11 has removed choice_value, but how to solve this problem?

1.10 https://docs.djangoproject.com/en/1.10/_modules/django/forms/widgets/
1.11 https://docs.djangoproject.com/en/1.11/_modules/django/forms/widgets/

Vehement

Did you tried value instead of choice_value ? – Revolution

@L_S I tried value return nothing. – Vehement

You can debug it youself from server side like dir(form.project[0]) – Revolution

Answer 1

As @L_S 's comments. I debug with dir(form), all value contained in form.project.data here's the correct code:

{% for choice in form.project %}
<labelc for="{{ choice.id_for_label }}">
    <input type="checkbox" name="{{ choice.data.name }}" id="{{ choice.id_for_label }}" 
    value="{{ choice.data.value }}"{% if choice.data.selected %} checked{% endif %}>
    {{ choice.data.label }}
</label>
{% endfor %}

Vehement

though already reflected in your solution, it may be worth noting that in django 1.11 the checked attribute rendered by form widgets now uses HTML5 boolean syntax rather than XHTML’s checked='checked' – Nacred

finally got it {{ choice.data.value }}. thanks, dude! +1 – Daveta

We ran into this problem when we upgraded from Django 1.9.5 to 2.x, and the same fix worked for us. – Premeditate