In your Customer model there are fields which cannot be Null, so you cannot
instance.save() before setting those properties. So, you may have to check
for the category field in your loop and if it is category, save the
instance first. Something like the following:
views.py (in clients application)
---------------------------------------------
class InscriptionWizard(SessionWizardView):
def done(self, form_list, **kwargs):
instance = Customer()
for form in form_list:
for field, value in form.cleaned_data.iteritems():
if field == 'category':
instance.save()
setattr(instance, field, value)
instance.save()
---------------------------------------------
This would of course depend on your ordering of the fields. In other words,
category would have to be the first Allow Null field in your model, because
you cannot save() until all Not Null fields have a value. If you cannot
order these fields so the category is last, you may have to do something
like:
views.py (in clients application)
---------------------------------------------
class InscriptionWizard(SessionWizardView):
def done(self, form_list, **kwargs):
instance = Customer()
for form in form_list:
for field, value in form.cleaned_data.iteritems():
if field != 'category':
setattr(instance, field, value)
instance.save()
for form in form_list:
for field, value in form.cleaned_data.iteritems():
if field == 'category':
setattr(instance, field, value)
---------------------------------------------
I'm sure there is a MUCH more elegant way of getting just the categories
from the forms and field/value pairs, this is brute force (not very
scalable for large number of fields), but should work. Anybody else please,
show code that could get the specific forms and field/values for categories.
Furbeenator
On Wed, Nov 2, 2011 at 10:28 AM, youpsla <youp...@gmail.com> wrote:
> Hello,
> i'm currently doning a website where user can register (without
> password, without auth module of Django). They put some informations
> and at the end (Step5Form) do multiple choices by clicking on
> checkboxes. When I click on validate on the last step I've "instance
> needs to have a primary key value before a many-to-many relationship
> can be used" error. I've search the web to find a solution but ..... :-
> (
>
> Here is my code:
>
> models.py for Customer (in clients application)
> ---------------------------------------------
> class Customer (models.Model):
>
> email_adresse = models.EmailField(max_length=255, unique=True)
> some fields ..... for Step2 to Step4 of the form
> category = models.ManyToManyField(Categories)
> ---------------------------------------------
>
> models.py for categories (in categories application)
> ---------------------------------------------
> class Categories (models.Model):
> category = models.CharField(max_length=200)
>
> def __unicode__(self):
> return unicode(self.category)
> ---------------------------------------------
>
> The ManyToMany field has created(syncdb) a table
> clients_customer_category with the following columns:
> 1 id int(11)
> AUTO_INCREMENT
> 2 customer_id int(11)
> 3 categories_id int(11)
>
>
> urls.py
> ---------------------------------------------
> urlpatterns = patterns('',
> (r'^clients/$', InscriptionWizard.as_view([Step1Form, Step2Form,
> Step3Form, Step4Form, Step5Form])),
> )
> ---------------------------------------------
>
>
> forms.py (in clients application)
> ---------------------------------------------
> from django import forms
> from clients.models import Customer
> from categories.models import Categories
>
> class Step1Form(forms.Form):
> email_adresse = forms.EmailField(max_length=255)
>
> class Step5Form(forms.Form):
> category =
> forms.ModelMultipleChoiceField(queryset=Categories.objects.all(),
> widget=forms.CheckboxSelectMultiple, required=True)
>
>
> views.py (in clients application)
> ---------------------------------------------
> class InscriptionWizard(SessionWizardView):
> def done(self, form_list, **kwargs):
> instance = Customer()
> for form in form_list:
> for field, value in form.cleaned_data.iteritems():
> setattr(instance, field, value)
> instance.save()
> ---------------------------------------------
>
> I got the following error:
> ---------------------------------------------
> Request Method: POST
> Request URL: http://127.0.0.1:8010/clients/
> Django Version: 1.3.1
> Exception Type: ValueError
> Exception Value:
> 'Customer' instance needs to have a primary key value before a many-to-
> many relationship can be used.
> ...............
> ...............
> ▶ Local vars
> C:\dev\Flash\clients\views.py in done
> setattr(instance, field, value) ...
> ---------------------------------------------
>
>
> What I've tried:
> 1)I've search the web and didn't find any way to solve this. I've read
> on save_m2m() wich doesn't apply here as far I understand because no
> "commit=False" and this form is not a ModelForm.
>
>
> 2)I've trie to save in 2 steps with the hope an id has been set in the
> DB:
> -First step : for form in form_list[0:3]: ...... instance.save()
> -Second step :
> for form in form_list[4]:
> for field, value in form.cleaned_data.iteritems():
> instance.category.add(value)
>
> I've the following error : 'BoundField' object has no attribute
> 'cleaned_data' for the line "for field, value in
> form.cleaned_data.iteritems():" in Second step.
>
>
> Then I can maybe split my form in 2 forms, one from Step0 to Step3 and
> another one for Step4 and passing the id_customer in teh session but
> maybe there is a solution to solve this issue in one form.
>
>
> Help will be really appreciated.
>
> I apologize if my explanations are not enough clear (and for my
> english) and feel free to ask informations.
>
> Regards
>
> Alain
>
>
>
>
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