I have been trying to set a default value on a ModelChoiceField for days and it just will not work (this is a form which the user can edit after creating it).. here is my code:
views.py
@login_required(login_url='/admin/login')
def edit_keydef(request, id):
data = {'title': 'View or Edit Key Definition'}
template = 'generate_keys/edit_keydef.html'
keydef = get_object_or_404(KeyDefinition, pk=id)
if request.method == "POST":
keydetails_form_instance = KeyDefDetailsForm(request.POST, instance=keydef)
if 'Save' in request.POST:
# stuff that saves the edited form.
if 'Generate' in request.POST:
# stuff that generates a key for the user
else:
keydetails_form_instance = None
if not id:
keydetails_form_instance = KeyDefDetailsForm()
else:
# Retrieve a previously saved form.
try:
keydetails = KeyDefinition.objects.get(pk=id)
keydetails_form_instance = KeyDefDetailsForm(keydetails.to_dict(),
instance = keydetails)
except KeyDefinition.DoesNotExist as e:
return redirect('/record_does_not_exist')
# Form instance has been saved at this stage so update the variant list.
keydetails_form_instance.update_variants(keydef)
keydetails_form_instance.update_available_hosts(keydef)
data['form'] = keydetails_form_instance
data['set_product_options_url'] = reverse_lazy('set_product_options', kwargs={'id':id})
return render(request, template, data)
forms.py
class KeyDefDetailsForm (ModelForm) :
def __init__(self, *args, **kwargs) :
super(ModelForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
self.helper.form_method = 'post'
self.fields['version'].widget.attrs['class'] = "major_minor"
self.fields['available_hosts'].default = self.fields['host_label']
def update_variants(self, keydef_obj):
# some code that updates the feature_variant field
def update_available_hosts(self, keydef_obj):
print(keydef_obj.host_label)
# only show hosts that have been created by this user
self.fields.update({
'available_hosts': forms.ModelChoiceField(
empty_label=None,
widget=Select(),
queryset = AvailableHosts.objects.filter(host_developer_email=keydef_obj.developer_email),
required = False,
label = "Available Hosts"
)
})
class Meta :
model = KeyDefinition
fields = '__all__'
widgets = {
'customer_name' : TextInput(),
'host_method' : TextInput(),
'issue_date' : TextInput(attrs={'type':'date'}),
'expiry_date': TextInput(attrs={"type":"date"}),
'available_hosts' : Select(),
'country' : Select(),
'feature' : Select(),
'activation_request' : HiddenInput(),
'hostid_provision' : HiddenInput(),
}
My problem is that I want to display a default value on the Available Hosts and hence why I have the line self.fields['available_hosts'].default = self.fields['host_label']
but this doesn't work unless I set empty_label="some string".. which is not what I want - I want the empty_label=None. However, with empty_label=None, the default value ends up being the one above self.fields['host_label'] -- I am so confused!!
