API error: Invalid format. data.request.POST string value found, but a object is required.

[BrianPainter]

Getting this error on the rollbar side whenever an error is generated in my Django app. Have successfully sent a test error, and a couple of the errors do come through, but a majority of them give the error in the title. Installed with the middleware per the instructions on Django 1.9.13. Let me know what other information would be useful in debugging this.

[rokob]

The only way I can see how this could be possible looking at the way the post data is set is that if something goes wrong in one of the transforms, probably the SerializableTransform, which results in some sort of fail-safe stringification of the dictionary. This is because data.request.POST is always set as dict(some_object) so it should end up as a JSON object.

Let me look into the transforms to see where they could break down.

[BrianPainter]

From what I can tell, it happens during the ShortenerTransform.

[lukas-gitl]

We have the same issue and my co-worker will provide more details shortly. This appears to be a recent regression.

[MacMcIrish]

What we've seen is that passing a dict with greater than 10 keys in the request.POST data, the 11th key and forward are truncated with a ... but the entire string is wrapped in { }.

rollbar.report_message(
    'message', payload_data={
        "request": {
            "POST": {i: i for i in range(11)}
        }
    }
)

Fails whereas

rollbar.report_message(
    'message', payload_data={
        "request": {
            "POST": {i: i for i in range(10)}
        }
    }
)

Succeeds.
Rolling back to rollbar==0.13.12 fixes the issue.

[rokob]

I am very strongly suspecting #176

[ezarowny]

@rokob hmm, maybe? I don't think I changed anything involving mapping types though. The only real interesting line in that PR is https://github.com/rollbar/pyrollbar/pull/176/files#diff-6022e85ab93e5271b24f7f04696aa09aR58

[rokob]

https://github.com/rollbar/pyrollbar/pull/176/files#diff-1fcbac3a897889dbaf8984fdfe14c99cR316 seems to be the one

[lukas-gitl]

@ezarowny If the issue was present before, then this line certainly "activated" it for us: https://github.com/rollbar/pyrollbar/pull/176/files#diff-1fcbac3a897889dbaf8984fdfe14c99cR316

[ezarowny]

Yeah, it's likely that your dict objects just weren't getting shortened in the old version. Good find guys.