What can be done to resolve the error message "Matchong query does not exist"?

Recently, I've been working on developing a like system similar to Instagram's using Django and Ajax. However, after completing the code, I encountered a frustrating error message that read "Post matching query does not exist." Despite thoroughly reviewing my code, I haven't been able to identify the issue. I suspect the problem may lie within the views.py file, as the traceback points to a specific line there. How can I troubleshoot and resolve this error?

models.py

class Post(models.Model):
      text = models.CharField(max_length=200)
      user = models.ForeignKey(User, on_delete=models.CASCADE, default='username')
      liked = models.ManyToManyField(User, default=None, blank=True, related_name='liked')

      def __str__(self):
        return str(self.id)

views.py (includes upload functionality, displaying home content, handling post likes/unlikes, and serializing for non-reloading)

def upload(request):
     ...  // (upload function code here)

def home(request):
    ...  // (home function code here)

def like_post(request):
    ...  // (like_post function code here)

def home_serialized(request):
    ...  // (home_serialized function code here)


urls.py

urlpatterns = [
    ...  // (URL patterns defined here)
]

home.html

    ...  // (Home page HTML template code here) 

traceback

Traceback (most recent call last):
  File "...", line ..., in ...
    response = get_response(request)
  ...  // (Additional traceback information here)

Answer №1

I'm not entirely certain about the contents of the traceback. If you could provide that information, it may help clarify the situation. My initial thought is that the issue lies with the line similar to

post_obj = Post.objects.get(pk=pk)
within the def like_post(request) function.

The error message indicates that a post with the specified primary key does not exist. To address this, you should verify the existence of the primary key.

if Post.objects.filter(pk=pk).exists():
    # The post exists

Alternatively, you can employ a try except approach:

try:
    post_obj = Post.objects.get(pk=pk)

    if user in post_obj.liked.all():
        post_obj.liked.remove(user)
    else:
        post_obj.liked.add(user)
except:
    # Handle cases where the post does not exist

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