Save ManyToMany relationship in the model

Using Django Forms & APIs
1

I am trying to save manytomany relationship. I have a form(in the template) that submits photos for the Business model. Business has manytomany relationship with BusinessPhotos.
As a result I am getting Business saved, and BusinessPhotos saved, but they are not linked.
When I look at Business model in the admin interface I see that BusinessPhotos associated with Businss are there, and I can select them.

image
image770×178 8.92 KB

What am i doing wrong?
I want for the photos to be added to the business.photos field automatically.

UPDATE AFTER TROUBLESHOOTING
I should’ve used request.FILES.get(“photo”) to get the files instead of request.POST.get(“photo”)
I was not saving Photos at all, BusinessPhoto objects I show in the screenshot were added by me through admin panel and i confused them for a successful addition…

class Business(models.Model):
     ...
    photos = models.ManyToManyField("BusinessPhoto", null=True, blank=True)
     ...

class BusinessPhoto(models.Model):
    photo = models.ImageField(
        upload_to=business_upload_location,
        null=True,
        blank=True,
        default="business/none/default.png",
    )
    timestamp = models.DateTimeField(default=timezone.now)
    is_primary = models.BooleanField(default=False)

@login_required
def add_business(request):
    if request.method == "POST":
        ...
        photo = request.POST.get("photo")
        photo_2 = request.POST.get("photo_2")
        photo_3 = request.POST.get("photo_3")

        business = Business(
            user_id=user_id,
            name=name,
            description=description,
            type=type,
            website=website,
            street=street,
            city=city,
            state=state,
            country=country,
            zip_code=zip_code,
            schedule=schedule,
            phone=phone,
            email=email,
        )
        business.save()
        if photo:
            business_photo_primary = BusinessPhoto(
                business_id=business, photo=photo, is_primary=True
            )
            business_photo_primary.save()
            business.photos.add(business_photo_primary)

        if photo_2:
            business_photo_2 = BusinessPhoto(business_id=business, photo=photo_2)
            business_photo_2.save()
            business.photos.add(business_photo_2)

        if photo_3:
            business_photo_3 = BusinessPhoto(business_id=business, photo=photo_3)
            business_photo_3.save()
            business.photos.add(business_photo_3)

        return redirect("index")
    return render(request, "reviewerx/add_business.html", {})
2

before this again call business.save()

3

Nothing helps to troubleshoot more then trying to formulate your problem on the forum ))

I should’ve used request.FILES.get(“photo”) to get the files instead of request.POST.get(“photo”)

@login_required
def add_business(request):
    if request.method == "POST":
        ...
        photo = request.FILES.get("photo")
        photo_2 = request.FILES.get("photo_2")
        photo_3 = request.FILES.get("photo_3")
4

I found it was not necessary as per: https://docs.djangoproject.com/en/4.2/topics/db/examples/many_to_many/