Streaming upload with StreamReader as data is not working

[Shivelight]

Long story short

I'm trying to re-upload images by chaining get and post requests as explained in the docs but it doesn't work.
https://docs.aiohttp.org/en/latest/client_quickstart.html#streaming-uploads

Expected behaviour

I'm not sure, is this expected behavior?

Actual behaviour

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/aiohttp/client_reqrep.py", line 372, in update_body_from_data
    body = payload.PAYLOAD_REGISTRY.get(body, disposition=None)
  File "/usr/lib/python3.6/site-packages/aiohttp/payload.py", line 62, in get
    raise LookupError()
aiohttp.payload.LookupError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.6/asyncio/base_events.py", line 467, in run_until_complete
    return future.result()
  File "<stdin>", line 4, in main
  File "/usr/lib/python3.6/site-packages/aiohttp/client.py", line 312, in _request
    ssl=ssl, proxy_headers=proxy_headers)
  File "/usr/lib/python3.6/site-packages/aiohttp/client_reqrep.py", line 208, in __init__
    self.update_body_from_data(data)
  File "/usr/lib/python3.6/site-packages/aiohttp/client_reqrep.py", line 374, in update_body_from_data
    body = FormData(body)()
  File "/usr/lib/python3.6/site-packages/aiohttp/formdata.py", line 28, in __init__
    self.add_fields(*fields)
  File "/usr/lib/python3.6/site-packages/aiohttp/formdata.py", line 90, in add_fields
    .format(rec))
TypeError: Only io.IOBase, multidict and (name, file) pairs allowed, use .add_field() for passing more complex parameters, got <StreamReader 2138 bytes>

Steps to reproduce

Just run the last example code of streaming upload section.

Your environment

Arch Linux, Python 3.6.4, aiohttp 3.0.5

[asvetlov]

StreamReader is not supported anymore, sorry.

Documentation should be updated.

[Shivelight]

I'll use the streamer decorator instead. Thanks for the clarify!

[asvetlov]

Welcome!

[asvetlov]

As of #2802 you can pass .content again.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new