django object has no attribute 'count'

Question

I am learning django / python and I am stuck on an issue.

I have a view: create_document.py in which I want to count the number of name details from a models class: NameDetails.

I cannot get the correct syntax!

Here is my models.py code:

class NameDetails(FillableModelWithLanguageVersion):
    user = models.ForeignKey(User)
    name_details_prefix_title = models.CharField(null=True, blank=True, max_length=25)
    name_details_first_name = models.CharField(null=False, blank=False, max_length=50)
    name_details_middle_name = models.CharField(null=True, blank=True, max_length=100)
    ....

Here is my create_document.py code in which I have a django wizard. I want to make sure the user has more than 1 name before they can create a document:

from app_name.core.models import NameDetails

class CreateDocumentWizard(SessionWizardView):
    template_name = 'documents/document_create.html'

    form_list = [
        core_forms.CreateDocumentWizardForm01,
        core_forms.CreateDocumentWizardForm02,
        core_forms.CreateDocumentWizardForm03,
        core_forms.CreateDocumentWizardForm04,
    ]

    def get_form_kwargs(self, step=None):
        kwargs = super(CreateDocumentWizard, self).get_form_kwargs(step)
        kwargs.setdefault('user', self.request.user)
        return kwargs

    def get_context_data(self, form, **kwargs):

        name_details_count = NameDetails(user=self.request.user).count()
        if name_details_count < 1:
            return redirect(settings.MENU_DETAIL_LINK_NAME_DETAILS)

When I use the line to determine the count of NameDetails of the user: name_details_count = NameDetails(user=self.request.user).count(), I get the following error:

NameDetails' object has no attribute 'count'

I have tried many permutations, but I am stuck.

Answer 1

It should be like that in your get_context_data function:

name_details_count = NameDetails.objects.filter(user=self.request.user).count()

Answer 2

At the moment you're creating a brand new NameDetails instance with request.user as the user. Instead, you should query the database for existing NameDetails for the current user, and count them. You can query the database through NameDetails.objects:

name_details_count = NameDetails.objects.filter(user=self.request.user).count()

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