Sorry to be "that noob" but help with Create/Post using TemplateHTMLRenderer and a nested serializer?

[Toni Marie Swats]

Here's my Stackoverflow question.

https://stackoverflow.com/q/53268218/3507247

bottom line, I have the browsable API working great but I need to render a
frontend form for Create. Frontend form for Update was fairly easy to get
using the DRF official docs. I'm just stumped on the Create form.

I feel stupid, but I'm new and I just want to get this project going.

[Carlton Gibson]

Hi Toni

I guess you’re hitting this:

https://github.com/encode/django-rest-framework/issues/5236 <https://github.com/encode/django-rest-framework/issues/5236>

See the PR here:

https://github.com/encode/django-rest-framework/pull/6095 <https://github.com/encode/django-rest-framework/pull/6095>

Basically TemplateRenderer needs a context dict (like a Django template) like this:

```
response.data = {'results': response.data}
```

I remember struggling with this. Nothing noob about it 😀

Kind Regards,

Carlton

[Toni Marie]

Yes I'm sure that's part of it. I tried a totally separate view for create:
class LicensedSoftwareList(APIView):
queryset = LicensedSoftware.objects.all()
serializer_class = LicensedSoftwareSerializer
renderer_classes = [TemplateHTMLRenderer]
template_name = 'licsoftware-detail.html'

def get(self, request, format=None):
licsoftware = LicensedSoftware.objects.all()
serializer = LicensedSoftwareSerializer(licsoftware)
return Response(serializer.data)

def post(self, request, format=None):
serializer = LicensedSoftwareSerializer(data=request.data)
serializer.save()

return redirect('../../licsoftware/')

The error returned is :

Got AttributeError when attempting to get a value for field `software` on serializer `LicensedSoftwareSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `QuerySet` instance.
Original exception text was: 'QuerySet' object has no attribute 'software'.


"software" is the nested model/serializer.

But I also tried it with a non-nested model and I got the same error for a field. Thoughts?

[Carlton Gibson]

Well, you can’t see from what you’ve provided but you LicencedSoftware model doesn’t have a foreign key called software to your Software model.

Sort that out and it will work. (Look at your references and make sure the names match.)

Sent from my iPhone

Post by Toni Marie
queryset = LicensedSoftware.objects.all()
serializer_class = LicensedSoftwareSerializer
renderer_classes = [TemplateHTMLRenderer]
template_name = 'licsoftware-detail.html'
licsoftware = LicensedSoftware.objects.all()
serializer = LicensedSoftwareSerializer(licsoftware)
return Response(serializer.data)
serializer = LicensedSoftwareSerializer(data=request.data)
serializer.save()
return redirect('../../licsoftware/')
Got AttributeError when attempting to get a value for field `software` on serializer `LicensedSoftwareSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `QuerySet` instance.
Original exception text was: 'QuerySet' object has no attribute 'software'.
"software" is the nested model/serializer.
But I also tried it with a non-nested model and I got the same error for a field. Thoughts?
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[Toni Marie]

It does, sadly so that isn't it:

class Software (models.Model):
brand = models.CharField(max_length=50, blank=True, null=False)
title = models.CharField(max_length=50, blank=True, null=False,
verbose_name="Software Title")
version = models.CharField(max_length=50, blank=True, null=False)
website = models.CharField(max_length=100, blank=True, null=False)
active = models.BooleanField()
notes = models.CharField(max_length=1000, blank=True, null=True)
assignees = models.ManyToManyField(User, related_name=
'software_assigned', blank=True, verbose_name="Installed Users:")


def __str__(self):
return "{0} {1} Version {2}".format(self.brand, self.title, str(self
.version))




class LicensedSoftware(models.Model):


software = models.OneToOneField(Software, primary_key=True, on_delete=
models.CASCADE)
vehicle = models.CharField(max_length=50, blank=True, null=False,
verbose_name="Contract/Purchase Vehicle")
vendor = models.CharField(max_length=50, blank=True, null=False)
licensekey = models.CharField(max_length=50, blank=True, null=False)
subscription = models.BooleanField()
term = models.CharField(max_length=50, blank=True, null=False)
renewaldate = models.DateField(blank=True, null=True, verbose_name="Renew
By")
supportincluded = models.BooleanField(verbose_name="Support Included")
numpurchased = models.IntegerField(blank=True, null=False, verbose_name="Licenses
Purchased")

[Carlton Gibson]

Looking at your original error, it seems you have a QuerySet where you should have an instance:

Got AttributeError when attempting to get a value for field `software` on serializer `LicensedSoftwareSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `QuerySet` instance.
Original exception text was: 'QuerySet' object has no attribute 'software'.

Most strange. Are you forgetting to call `get()` somewhere?

I can’t tell from the code you’ve posted.

software = models.OneToOneField(Software, primary_key=True,on_delete=models.CASCADE)

[Toni Marie]

Post by Toni Marie
queryset = LicensedSoftware.objects.all()
serializer_class = LicensedSoftwareSerializer
renderer_classes = [TemplateHTMLRenderer]
template_name = 'licsoftware-detail.html'
licsoftware = LicensedSoftware.objects.all()
serializer = LicensedSoftwareSerializer(licsoftware)
return Response(serializer.data)
serializer = LicensedSoftwareSerializer(data=request.data)
serializer.save()
return redirect('../../licsoftware/')
I totally get that I'm NOT doing something right. If someone can figure

it out I even put up a Stackoverflow bounty. I will pay cash money to get
just one working create form that I can replicate for the project (I have
many serializers after this for my app)

[Dipen bhatt]

Hey there Toni, I have posted an answer on stackoverflow. Check it out and
hope it helps. And do mention if i did something you wanted differently.
Peace

Post by Toni Marie

Post by Toni Marie
queryset = LicensedSoftware.objects.all()
serializer_class = LicensedSoftwareSerializer
renderer_classes = [TemplateHTMLRenderer]
template_name = 'licsoftware-detail.html'
licsoftware = LicensedSoftware.objects.all()
serializer = LicensedSoftwareSerializer(licsoftware)
return Response(serializer.data)
serializer = LicensedSoftwareSerializer(data=request.data)
serializer.save()
return redirect('../../licsoftware/')
I totally get that I'm NOT doing something right. If someone can figure

it out I even put up a Stackoverflow bounty. I will pay cash money to get
just one working create form that I can replicate for the project (I have
many serializers after this for my app)
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[Toni Marie]

I really appreciate you taking the time to help.

My issue is not with the APIView, it works fine in the API itself.

My issue is a frontend HTML form. The docs on TemplateHTMLRenderer are
very clear on how to create an update form,
https://www.django-rest-framework.org/topics/html-and-forms/#rendering-forms

HOWEVER, creating a blank form to CREATE, I can't seem to pull the correct
"get" method to serialize the form fields.

[Toni Marie]

This is finally working. If anyone has a similar issue with
TemplateHTMLRenderer creates, see the above StackOverflow thread. There's
a small glitch that was solved in our discussion, which is to make sure
that the POST response is to redirect to a new url. Which I did in my
application.