EditCollectionView - how to a CreateCollectionView

[gumish]

Could you please tell me anybody how to do a collection view which wil create the main_object (also with it's child forms)?
The editing of the main_object works well with EditCollectionView but there is no CreateCollectionView.

The model case (without child collection):

class Company(models.Model):
    name = models.CharField('Name', max_length=50, unique=True)
    employees = models.IntegerField('Employes', null=True, blank=True)

class CompanyForm(forms.ModelForm):
    class Meta:
        model = Company
        fields = '__all__'

class CompanyCollection(FormCollection):
    form = CompanyForm()

class CompanyCollectionView(EditCollectionView):
    ''' editing view '''
    model = Company
    collection_class = CompanyCollection

[gumish]

In Django I usually modify get_object() of generic.UpdateView to do both create-update tasks:

def get_object(self, queryset=None):
    try:  # updateview
        return super().get_object(queryset)
    except (AttributeError, FieldError):  # createview
        return None

But this doesn't work with EditCollectionView ->

Traceback (most recent call last):
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\django\core\handlers\exception.py", line 56, in inner
    response = get_response(request)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\django\core\handlers\base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\django\views\generic\base.py", line 103, in view
    return self.dispatch(request, *args, **kwargs)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\django\views\generic\base.py", line 142, in dispatch
    return handler(request, *args, **kwargs)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\formset\views.py", line 221, in post
    return super().post(request, *args, **kwargs)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\formset\upload.py", line 99, in post
    return super().post(request, **kwargs)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\formset\views.py", line 170, in post
    return self.form_collection_valid(form_collection)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\formset\views.py", line 232, in form_collection_valid
    form_collection.construct_instance(self.object, form_collection.cleaned_data)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\formset\collection.py", line 292, in construct_instance
    construct_instance(holder, main_object, opts.fields, opts.exclude)
  File "D:\03__Web\testproject\_virtenv\lib\site-packages\django\forms\models.py", line 52, in construct_instance
    opts = instance._meta
AttributeError: 'NoneType' object has no attribute '_meta'

[jrief]

For now, please try with branch https://github.com/jrief/django-formset/tree/issue_37 and use slug company for testing.

[gumish]

Yes, it seems alright.

[suspiciousRaccoon]

The branch is no longer available and I wasn't able to find a CreateCollectionView example in the testapp. Is there a chance of adding this to the documentation?

[jrief]

This branch has been merged und hence it's deleted.

Did you try with the provided example named "company collection"?

[suspiciousRaccoon]

Hey, thanks for pointing me in the right direction. After fiddling around with the CompanyCollection view I managed to make a CreateCollectionView.

For future reference, this is what I did:

class CreateCollectionView(EditCollectionView):
    def get_object(self, queryset=None):
        return None

    def form_collection_valid(self, form_collection):
        if not self.object:
            self.object = self.model.objects.create()
        return super().form_collection_valid(form_collection)

[nicokant]

Hi, I ended up writing the same code as above, with the same AttributeError: 'NoneType' object has no attribute '_meta' error, but it's not clear to me how to solve it. It seems also that there also other questions about how to write a CreateCollectionView, but it's still not clear to me how to do it, and I can't find a solution in the documentation. Would it be possible to provide a CreateCollectionView together with the EditCollectionView?