Update data

If you had no problems with the Create and Retrieve operations, you should be able to easily understand the logic of updating data. Let's break down the logic into certain steps:

1. Extract the object and write it in a variable.
2. Reassign attributes.
3. Save the changes using the save() method

Let's look at the example.

URL pattern

path("posts/<int:pk>/update/", post_update, name="post-update")

View function

def post_update(request, pk):
    post = Post.objects.get(pk=pk)
    post.title = "Updated Post"
    post.text = "This post was updated"

    post.save()

    return HttpResponse(f"<h1>Post with id {post.id} updated</h1>")

Result

The provided code updates the Post using pk (id) received from the URL address.

Delete Data

To delete data, you just need to extract data and use the delete() object method.

URL pattern

path("posts/<int:pk>/delete/", post_delete, name="post-delete")

View function

def post_delete(request, pk):
    post = Post.objects.get(pk=pk)
    post.delete()

    return HttpResponse(f"Delete Post (id {post.id})")

Result

You can see that None is displayed instead of post id. The fact is that the object was already deleted by the delete() method, and, accordingly, it does not have an id because it is no longer in the database.

To display the id of the deleted object, you can store it in a variable and then output it using HttpResponse.

def post_delete(request, pk):
    post = Post.objects.get(pk=pk)
    post_id = post.id  # new
    post.delete()

    return HttpResponse(f"Delete Post (id {post_id})")  # updated