Problem with sending django channels event from models

[luan fonceca]

Hello, i'm trying to implement a "post_save" signal wherever some user are update. I setup everything by following the documentation and some tutorials for Channels 2. I wrote a test using "py.test" to assert that everything is working as expected but i'm getting a exception.

On this link i have posted a gist.

Thanks in advance.

[Andrew Godwin]

You need to post the full traceback, not just the last section. I suspect what you are doing is calling model methods directly in an async function, but I can't confirm that without a full traceback.

Andrew

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[luan fonceca]

Hello Andrew, sorry for the lack of traceback on the gist. I have changed my code a bit, i was using the `async_to_sync` but now i'm using this way inside my User save method:

channel_layer = get_channel_layer()

channel_layer.group_send(

    'users_{}'.format(self.pk), {

        'type': 'users.post_save',

        'user_pk': self.pk

    }

)

And everything works fine, but my tests are raising warnings on each test, like this, if you want to see the full traceback of my test, click here:

users/tests/test_consumers.py::test_user_consumer

  /Users/luan/Sources/channels-test/users/models.py:56: RuntimeWarning: coroutine 'RedisChannelLayer.group_send' was never awaited

    'user_pk': self.pk

I have update my gist, if you want to see something else, but in general i'm using py.test, as you can see in here.

https://gist.github.com/luanfonceca/dafecba067d4caa8bfcf22d683409531

Thanks for everything, Andrew.

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[Andrew Godwin]

Yes, you can't just call "group_send" without awaiting it, or you'll get those warnings. You need async_to_sync, I'm afraid. Otherwise, you're not actually waiting for the group_send function to finish and you'll start getting some unreliable test results.

Andrew

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