Re: Unable to save object with images while using FormWizard in Django 1.7 and Python 3.4

Hi,

Use items() instead of iteritems().

Collin

On Thursday, January 22, 2015 at 11:31:23 AM UTC-5, Frankline wrote:

​Hi all​,

I am having a problem saving a Django form using the FormWizard while using Django 1.7 and Python 3.4. Below is my code:

models.py

...  class Advert(models.Model):      ... # Some irelevant code removed for brevity      owner = models.ForeignKey(settings.AUTH_USER_MODEL, db_index=True, blank=False, null=False)      title = models.CharField(_("Title"), max_length=120)      description = models.TextField(_("Description"), default='')      category = models.ForeignKey(AdCategory, db_index=True, related_name='ad_category', verbose_name=_('Category'))      status = models.IntegerField(choices=ADVERT_STATES, default=0)      adtype = models.IntegerField(choices=ADTYPES, default=1)      price = models.DecimalField(_('Price'), max_digits=12, decimal_places=2, blank=True, default=0,                              help_text=_('Price'), validators=[MinValueValidator(0)])                                ...  class AdvertImage(models.Model):        def generate_new_filename(instance, filename):          IMAGE_UPLOAD_DIR = "advert_images"          old_fname, extension = os.path.splitext(filename)          return '%s/%s%s' % (IMAGE_UPLOAD_DIR, uuid.uuid4().hex, extension)                advert = models.ForeignKey(Advert, related_name='images')      image = models.ImageField(upload_to=generate_new_filename, null=True, blank=True)

forms.py

from django.forms.models import inlineformset_factory  from django import forms  from django.forms import ModelForm, RadioSelect, TextInput    from .models import Advert, AdvertImage      class AdvertCategoryForm(ModelForm):        class Meta:          model = Advert          fields = ('category',)      class AdvertDetailsForm(ModelForm):        class Meta:          model = Advert          fields = ('title', 'description', 'location', 'adtype', 'price')      class AdvertImageForm(ModelForm):        class Meta:          model = AdvertImage          fields = ('image',)    AdvertImageFormset = inlineformset_factory(Advert, AdvertImage, fields=('image',), can_delete=False, extra=3, max_num=3)      FORMS = [("ad_category", AdvertCategoryForm),           ("ad_details", AdvertDetailsForm),           ("ad_images", AdvertImageFormset)]    TEMPLATES = {"ad_category": "adverts/advert_category_step.html",               "ad_details": "adverts/advert_details_step.html",               "ad_images": "adverts/advert_images_step.html"}

views.py

...  class AdvertWizard(LoginRequiredMixin, SessionWizardView):        form_list = FORMS      file_storage = FileSystemStorage(location=os.path.join(settings.MEDIA_ROOT))        def get_template_names(self):          return [TEMPLATES[self.steps.current]]        ...        def done(self, form_list, **kwargs):          advert = Advert()          """for form in form_list:              for field, value in form.cleaned_data.iteritems():                  setattr(advert, field, value)"""            form_dict = {}          for form in form_list:              form_dict.update(form.cleaned_data)            advert.owner = self.request.user          advert.save()          redirect(advert)

​The problem occurs in the done method while saving the form:

ValueError at /ads/new
dictionary update sequence element #0 has length 3; 2 is required
Request Method:
POST
Request URL:
http://localhost:8000/ads/new
Django Version:
1.7.1
Exception Type:
ValueError
Exception Value:
dictionary update sequence element #0 has length 3; 2 is required
Exception Location:
/home/frank/Projects/python/django/pet_store/src/petstore/apps/adverts/views.py in done, line 147
Python Executable:
/home/frank/.virtualenvs/petstore/bin/python
Python Version:
3.4.0
/home/frank/Projects/python/django/pet_store/src/petstore/apps/adverts/views.py in done
            form_dict.update(form.cleaned_data)
 ...
▶ Local vars

However, when I replace the following code:

form_dict = {}          for form in form_list:              form_dict.update(form.cleaned_data)

with this one

for form in form_list:      for field, value in form.cleaned_data.iteritems():          setattr(advert, field, value)

I now get the following error:

AttributeError at /ads/new
'dict' object has no attribute 'iteritems'
Request Method:
POST
Request URL:
http://localhost:8000/ads/new
Django Version:
1.7.1
Exception Type:
AttributeError
Exception Value:
'dict' object has no attribute 'iteritems'
Exception Location:
/home/frank/Projects/python/django/pet_store/src/petstore/apps/adverts/views.py in done, line 140
Python Executable:
/home/frank/.virtualenvs/petstore/bin/python
Python Version:
3.4.0
Python Path:
['/home/frank/Projects/python/django/pet_store/src/petstore',   '/home/frank/.virtualenvs/petstore/lib/python3.4',   '/home/frank/.virtualenvs/petstore/lib/python3.4/plat-x86_64-linux-gnu',   '/home/frank/.virtualenvs/petstore/lib/python3.4/lib-dynload',   '/usr/lib/python3.4',   '/usr/lib/python3.4/plat-x86_64-linux-gnu',   '/home/frank/.virtualenvs/petstore/lib/python3.4/site-packages'
Server time:
Thu, 22 Jan 2015 19:25:22 +0300

Probably this has to do with the images that have been added through inlineformset, and the lack of iteritems method in Python 3.4.

How can I fix this to be able to save the object along with the images through Django's FormWizard?

Thanks

P.S.: Apologies for the long post.

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