Django class based view, save in another model after CreateView - django

Question

I have a create view (Loan_assetCreateView(generic.CreateView)) where I save if an asset is going to be loaned and when it will be returened in a model called Loan_asset(models.Model). Then I have the asset in a diffrent model Asset(model.Model). I would like to once I have saved my data in my Loan_assetCreateView(generic.CreateView) that is set the value in Asset.is_loaned to True. How can I do that?
My models.py:
class Asset(models.Model):
# Relationships
room = models.ForeignKey("asset_app.Room", on_delete=models.SET_NULL, blank=True, null=True)
model_hardware = models.ForeignKey("asset_app.Model_hardware", on_delete=models.SET_NULL, blank=True, null=True)
# Fields
name = models.CharField(max_length=30)
serial = models.CharField(max_length=30, unique=True, blank=True, null=True, default=None)
mac_address = models.CharField(max_length=30, null=True, blank=True)
purchased_date = models.DateField(null=True, blank=True)
may_be_loaned = models.BooleanField(default=False, blank=True, null=True)
is_loaned = models.BooleanField(default=False, blank=True, null=True)
missing = models.BooleanField(default=False, blank=True, null=True)
notes = HTMLField(default="")
ip = models.CharField(max_length=90, null=True, blank=True)
created = models.DateTimeField(auto_now_add=True, editable=False)
last_updated = models.DateTimeField(auto_now=True, editable=False)
class Loan_asset(models.Model):
# Relationships
asset = models.ForeignKey("asset_app.Asset", on_delete=models.SET_NULL, blank=True, null=True)
loaner_type = models.ForeignKey("asset_app.Loaner_type", on_delete=models.SET_NULL, blank=True, null=True)
location = models.ForeignKey("asset_app.Locations", on_delete=models.SET_NULL, blank=True, null=True)
# Fields
loaner_name = models.CharField(max_length=60)
loaner_address = models.TextField(max_length=100, null=True, blank=True)
loaner_telephone_number = models.CharField(max_length=30)
loaner_email = models.EmailField()
loaner_quicklink = models.URLField(null=True, blank=True)
loan_date = models.DateField()
return_date = models.DateField()
notes = HTMLField(default="")
returned = models.BooleanField(default=False, blank=True, null=True)
created = models.DateTimeField(auto_now_add=True, editable=False)
last_updated = models.DateTimeField(auto_now=True, editable=False)
class Meta:
pass
def __str__(self):
return str(self.loaner_name)
def get_absolute_url(self):
return reverse("asset_app_loan_asset_detail", args=(self.pk,))
def get_update_url(self):
return reverse("asset_app_loan_asset_update", args=(self.pk,))
my urls.py
`path("asset_app/loan_asset/create/", views.Loan_assetCreateView.as_view(), name="asset_app_loan_asset_create")`,
my views.py
class Loan_assetCreateView(generic.CreateView):
model = models.Loan_asset
form_class = forms.Loan_assetForm

Answer 1

Here are some options:
override form_valid method that's being called in post method implementation, so that after form will be validated (model instance saved), you'll be able to set the flag through foreign key/by creating Asset instance:
...
def form_valid(self, form):
self.object = form.save()
if self.object.asset:
self.object.asset.is_loaned = True
else:
self.object.asset = Asset.objects.create(is_loaned=True)
return HttpResponseRedirect(self.get_success_url())
use Django signals:
#receiver(post_save, sender=Loan_asset)
def create_transaction(sender, instance, created, **kwargs):
if created:
Asset.objects.create(is_loaned=True)

Answer 2

You can override the post method in your Loan_assetCreateView.
class Loan_assetCreateView(generic.CreateView):
model = models.Loan_asset
form_class = forms.Loan_assetForm
def post(request, *args, **kwargs):
response = super().post(request, *args. **kwargs)
# Do your thing
return response