Are trying to save data for Customer that does not exist in your
CustomerData table yet. Because I think the error is tries to inform you
that Billing data can only be created for a customer that already exists on
you CustomerData
On Sunday, August 25, 2019 at 5:17:24 PM UTC+3, Asaduzzaman Sohel wrote:
>
> I've two model. I would like to save data from ForeignKey model. I'm
> created a modelform and save with my main foreignkey model. But I got this
> error ValueError at /c/customer/1/ Cannot assign "'1'":
> "BillingData.customer" must be a "CustomerData" instance.
>
> I created Django model form and hocked up with view.
>
> models.py file
>
> class CustomerData(models.Model):
> customer_name = models.CharField(max_length=100)
> customer_no = models.CharField(max_length=100, default='', blank=True)
> mobile_number = models.IntegerField()
> alternative_phone = models.IntegerField(null=True, blank=True)
> union_name = models.ForeignKey(UnionName, on_delete=models.SET_NULL,
> null=True)
> word_name = models.ForeignKey(UnionWordName, on_delete=models.SET_NULL,
> null=True)
> full_address = models.CharField(max_length=200, null=True, blank=True)
> create_date = models.DateTimeField(auto_now_add=True)
> updated = models.DateTimeField(auto_now=True)
>
> def __str__(self):
> return '%s, Mobile: %s' % (self.customer_name, self.mobile_number)
>
> def get_absolute_url(self):
> return reverse('customer_data', kwargs={'pk': self.pk})
>
> class BillingData(models.Model):
> bill_no = models.CharField(max_length=100, default='', blank=True)
>
> customer = models.ForeignKey(CustomerData, on_delete=models.CASCADE)
> sales_person = models.ForeignKey(settings.AUTH_USER_MODEL,
> on_delete=models.SET_NULL, null=True)
> customer_money = models.IntegerField()
> create_date = models.DateTimeField(auto_now_add=True)
> updated = models.DateTimeField(auto_now=True)
>
> def __str__(self):
> return '%s %s' % (self.customer.customer_name,
> self.create_date.date())
>
> def get_absolute_url(self):
> return reverse('customers.views.BillingPage', kwargs={'pk': self.pk})
>
> forms.py file
>
> class BillCreateForms(forms.ModelForm):
> bill_no = forms.CharField(max_length=100)
> customer = forms.ChoiceField(choices=[(x.id, x.customer_name) for x in
> CustomerData.objects.all()])
> customer_money = forms.IntegerField()
>
> def save(self, commit=True):
> instance = super(BillCreateForms, self).save(commit=False)
> customer_pk = self.cleaned_data['customer']
>
> instance.customer_id = CustomerData.objects.get(pk=customer_pk).pk
> instance.save(commit)
> return instance
>
> class Meta:
> model = BillingData
> fields = ('bill_no', 'customer', 'customer_money',)
>
> views.py file
>
> class CustomerDataView(FormMixin, generic.DetailView):
> model = CustomerData
> form_class = BillCreateForms
> template_name = "customers/customerdata_detail.html"
> print(form_class)
>
> success_url = '/c/'
>
> def post(self, request, *args, **kwargs):
> if not request.user.is_authenticated:
> return HttpResponseForbidden()
> form = self.get_form()
> if form.is_valid():
> return self.form_valid(form)
> else:
> return self.form_invalid(form)
>
> I expect data save with foreignkey relation data. But doesn't save here.
>
>
> models.py file https://paste.ubuntu.com/p/8RKDGwjhgh/
> <https://paste.ubuntu.com/p/8RKDGwjhgh/?fbclid=IwAR0gO5OflCkVDFWAs9jXc3yPhNmCMn_4ZEGcr-nvL9QAZxFsgNhRG7E4YlA>
> forms.py file https://paste.ubuntu.com/p/gD4B5nFWJP/
> <https://paste.ubuntu.com/p/gD4B5nFWJP/?fbclid=IwAR2x0m3NoyLIYDeSug_xtZxPG4ZGItfp3ICzSxMozwSLOxnrt1TBVce-A0I>
> views.py file https://paste.ubuntu.com/p/njyfwNztY9/
> <https://paste.ubuntu.com/p/njyfwNztY9/?fbclid=IwAR2ZDD8Xgit0VPxm4W4qvaPUFyQsSdeNR77oqQSdWTRw9c9b5PdMU8JTKvI>
>
>
> this is full traceback paste.ubuntu.com/p/Z92rVxJpnJ
>
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