Editing Fromset ModelChoiceField - django

Question

When i edit formset the ModelChoiceField don't show initial value (it show the empty label). I use this example
https://whoisnicoleharris.com/2015/01/06/implementing-django-formsets.html
demande\forms.py
class LinkForm(forms.Form):
etabz = forms.ModelChoiceField(empty_label="Choisir un établissement",\
queryset=Etablissement.objects.all().order_by('univ','etablissement').distinct(),
)
# etabz = forms.CharField()
def __init__(self, *args, **kwargs):
dbz = kwargs.pop("dbz", None)
super(LinkForm, self).__init__(*args, **kwargs)
if dbz:
self.fields["etabz"].queryset = Etablissement.objects.filter(univ__corps=dbz)
class BaseLinkFormSet(BaseFormSet):
def clean(self):
if any(self.errors):
return
anchors = []
urls = []
duplicates = False
for form in self.forms:
if form.cleaned_data:
dona = form.cleaned_data.get('etabz')
anchor = dona.etablissement
if anchor :
if anchor in anchors:
duplicates = True
anchors.append(anchor)
if duplicates:
raise forms.ValidationError(
'Vous ne pouvez choisir le même établissement plusiuers fois.',
code='duplicate_etab'
)
def __init__(self, *args, **kwargs):
super(BaseLinkFormSet, self).__init__(*args, **kwargs)
for form in self.forms:
form.empty_permitted = False
Demande\views.py
#login_required
def demande(request):
user = request.user
corpsorigine = user.profile.corps
uz = get_object_or_404(session, active=True, destine = user.profile.corps)
choice_links = choix.objects.filter(demandeur = user, session = uz )
link_data = [{'etabz': l}
for l in choice_links]
LinkFormSet = formset_factory(LinkForm, formset=BaseLinkFormSet, extra=1)
if request.method == 'POST':
link_formset = LinkFormSet(request.POST,form_kwargs={'dbz':corpsorigine })
if link_formset.is_valid():
new_links = []
for link_form in link_formset:
dona = link_form.cleaned_data.get('etabz')
try:
univ = dona.univ
etablissementa = dona.etablissement
except:
messages.error(request, 'Une exception à provoqué une erreur. veuillez ré-essayer ultérieurement')
return redirect(reverse('blog:post_list'))
if etablissementa and univ:
new_links.append(choix(demandeur = user,session=uz.annee_session, etablissement_demande=etablissementa, universite_demande=univ))
try:
with transaction.atomic():
UserLink = choix.objects.all()
UserLink.filter(session= uz.annee_session,demandeur = user).delete()
UserLink.bulk_create(new_links)
messages.success(request, 'Votre demande à été correctement saisie/mis à jour.')
return redirect(reverse('blog:post_list'))
except IntegrityError: # If the transaction failed
messages.error(request, 'Une exception à provoqué une erreur. veuillez ré-essayer ultérieurement')
return redirect(reverse('blog:post_list'))
else:
link_formset = LinkFormSet(initial=link_data,form_kwargs={'dbz':corpsorigine })
context = {
'uz':uz,
'link_formset': link_formset,
'choice_links':choice_links
}
return render(request, 'edit_pro.html', context)
Account\Models.py
class universite (models.Model):
gouvernorat= models.CharField(max_length=250)
universite = models.CharField(max_length=250)
corps = models.CharField(max_length=20, choices=corps_CHOICES)
class Meta:
unique_together = ('gouvernorat', 'universite')
def __str__(self):
return self.universite
class etablissement(models.Model):
etablissement = models.CharField(max_length=250)
univ = models.ForeignKey(universite, related_name='etab_universites')
def __unicode__(self):
return "{} de l'universite {}".format(self.etablissement,self.univ)
Demande\models.py
class choix(models.Model):
demandeur = models.ForeignKey(User, related_name='user_choice')
# universite_demande = models.ForeignKey(universite, related_name='universite_choice')
session = models.CharField(max_length=250)
universite_demande = models.CharField(max_length=250)
etablissement_demande = models.CharField(max_length=250)
class Meta:
unique_together = ('demandeur', 'session','etablissement_demande')
def __unicode__(self):
return "{} de l'universite {}".format(self.etablissement_demande, self.universite_demande)
In demande\forms.py If i change forms.ModelChoiceField... to forms.CharField it works perfectly. How it can works on ModelChoiceField ?