MultipleChoiceField form not displaying user's instance of form - django

Question

I've implemented a MultipleChoiceField form with a CheckboxSelectMultiple. It works perfectly in that the form is displayed and user selected options are saved to the BaseServicesOffered model as desired. The problem is that when the user goes back to the form, the checkboxes that the user had previously selected/submitted are not selected -- they are all unchecked. I'd imagine that it's a problem with my views.py. Here is my code:
models.py
class BaseServicesOffered(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
service = models.CharField(max_length=255, default='', null=True, blank=True)
def __str__(self):
return self.user.username
forms.py
class BaseServicesOfferedForm(forms.ModelForm):
service = forms.MultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple)
def __init__(self, *args, **kwargs):
user = kwargs.pop('user') #this takes in the value of 'user', which is passed from the view function.
super(BaseServicesOfferedForm, self).__init__(*args, **kwargs)
self.fields['service'].choices = [(t.id, t.service) for t in AllServices.objects.filter(industrycode=user.userprofile.industry)]
class Meta:
exclude = ('user',)
model = BaseServicesOffered
views.py
#login_required(login_url="/accounts/login/")
def baseservicesoffered(request):
try:
base_services_offered = BaseServicesOffered.objects.create(user=request.user)
except:
pass
user = request.user
instance = get_object_or_404(BaseServicesOffered, user=user)
form = BaseServicesOfferedForm(request.POST or None, user=request.user, instance=instance)
if request.method == 'POST':
if form.is_valid():
instance = form.save(commit=False)
instance.user = request.user
service = form.cleaned_data['service']
services = [int(i) for i in service]
instance.service = services
instance.save()
return redirect('/accounts/profile/')
else:
context = {'form': form}
return render(request, 'accounts/setup8.html', context)
context = {'form': form}
return render(request, 'accounts/setup8.html', context)
setup8.html
<form id="post_form" method="post" action="" enctype="multipart/form-data">
{{ form.non_field_errors }}
{% csrf_token %}
{{ form.as_p }}
<div class="submitbutton">
<button type="submit">
SUBMIT
</button>
</div>
</form>
Update:
This is how you store a list of ints in the Charfield:
service = form.cleaned_data['service']
services = [int(i) for i in service] #converts list of strings to list of ints
instance.service = services
I've updated my code above with this.

Answer 1

multiple_choice = forms.MultipleChoiceField(
label=u"Select multiple",
choices=MY_CHOICES,
widget=forms.widgets.CheckboxSelectMultiple,
initial=(c[0] for c in MY_CHOICES)
)
You should set the inital parameter for the options to be checked for a particular user.