Oupsss, another question in the step by step:
1 class InscriptionWizard(SessionWizardView):
2 def done(self, form_list, **kwargs):
3 instance = Customer()
4 for form in form_list:
5 for field, value in form.cleaned_data.iteritems():
6 if field == 'category':
7 instance.save()
8 setattr(instance, field, value)
9 instance.save()
Line 7 : Will save in the DB all fields that have been already
iterated. Then I suppose the instance.save() will not clear
informations affected by the setattr() otherwise the PK is lost ...
and the Line 9 doesn't know wich PK to use ....
Then I suppose the Line 9 will save all informations of the form,
those which have been already saved by Line 7 and add category. Then I
suppose Django will perform an "UPDATE" rather than an "INSERT" SQL
statement ?
Is it right ?
Again, regards for the time spend to answer.
Alain
On 2 nov, 19:03, Furbee <furbeena...@gmail.com> wrote:
> 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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