Is request.data truly immutable?

[roozmr]

Hi, I am developing a POST API in which I send multipart/form-data content including an optional file field in request body.

Testing the API, I sent only text data in form fields and I encountered an error trying to add an extra field (like the code below) to request.data saying that This QueryDict instance is immutable and by Querydict it means request.data.

ticket = fetch_some_object()
request.data["ticket"] = ticket.id

But when I include files in form, API works without an error.

I traced the error and it seems when files are included in request.data, the request's self._mutable is True while it is False when files are not included.

In the screen shot below from django.http.request.QueryDict, AttributeError is raised as I did not inlcude any files.

In the next one raise statement is bypassed for self._mutable is True (attachments attribute includes InMemoryUploadedFiles).

So, which one is the desired output?

[roozmr]

I found a previous closed issue #7633 addressing this problem. But I am using the latest DRF version and issue still persists.

[auvipy]

what about #7634 ?

[roozmr]

I see, the commit is merged to master in 2020, yet the latest release has been out from Nov 2022 and I ran into the same error using the latest version.