how do I get all the objects associated with a foreignkey field-CodePudding

How do I get all the objects associated with the foreignkey field in "ProductImage". So I've multiple images for one "Product" model in "ProductImage", how do I get all of the associated ones. Currently, I'm getting an error "MultipleObjectsReturned at /shop/product-slug" idk what I'm doing wrong, would appreciate it a lot if someone can help! thx!

models.py

class Product(models.Model):
    name = models.CharField(max_length=150)
    description = models.TextField()
    image = models.ImageField(null=True, blank=True)


class ProductImage(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    name = models.CharField(max_length=50)
    image = models.ImageField(null=True, blank=True, upload_to='productimg/')

urls.py

path("<slug:slug>", views.detail_view, name="detail_view"),

views.py

def detail_view(request, slug): 
    products = Product.objects.get(slug=slug)
    productimg = ProductImage.objects.get(product=products)

CodePudding user response：

To find all related objects in Django, use filter method that returns a queryset, use get method instead if you know there is only one object that matches your query.

Read more in the official Django documentation

Another tip: when using get, it's highly recommended you surround it with try except block in order to make your code brokenless if the selected object is not found. Your code could be like that :

def detail_view(request, slug):
  try:
    products = Product.objects.get(slug=slug)
    productimg = ProductImage.objects.filter(product=products)
  except Product.DoesNotExist as e:
    print(f"My error {e}")
    # ... other error handling

  for image in  productimg :
    # your logic here