invalid `trigger_id` modal.push

I found a bug in Shortcut Modal Push (https://api.slack.com/surfaces/modals/using#pushing_api).

I created a modal by this guide (https://github.com/slackapi/python-slackclient/blob/a86536766274b02f8e6a7532f9b5494f1a8ae354/docs-src/basic_usage.rst#opening-a-modal) and filled it with proper elements (input, submit and etc.) and everything works fine in slack. But when I send client.views_push() I get an error from slack’s server invalid 'trigger_id' Also I tried to reproduce this issue without python-slackclient using requests library and got same result. According to logs I respond to server less then 3 second.

Reproducible in:

client = WebClient(token=slack_token)
view = {
        "type": "modal",
        "title": {"type": "plain_text", "text": "Show me result"},
        "blocks": []
}
try:
        api_response = client.views_push(
            trigger_id=payload["trigger_id"],
            view=view,
        )
        logger.info(api_response)
    except Exception as e:
        logger.error(repr(e))
        raise

The Slack SDK version

slackclient==2.8.2

Python runtime version

Python 3.8.2

OS info

Linux semu 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Steps to reproduce:

1. if payload[“type”] == “shortcut”: api_response = client.views_open()
2. elif payload[“type”] == “view_submission”: api_response = client.views_push()

Expected result:

Expected result [‘ok’] == True and slack API except trigger_id.

Actual result:

slack.errors.SlackApiError: The request to the Slack API failed. The server responded with: {'ok': False, 'error': 'invalid_arguments', 'response_metadata': {'messages': ['[ERROR] invalid 'trigger_id' [json-pointer:/trigger_id]']}}

Requirements

For general questions/issues about Slack API platform or its server-side, could you submit questions at https://my.slack.com/help/requests/new instead. 🙇

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

[seratch]

Hi @kompotkot thanks for writing in!

In response to a view_submission type request, please use response_action: push in its HTTP response instead of calling views.push API methods. Refer to this document for details: https://api.slack.com/surfaces/modals/using#pushing_views

If you’re using Flask as with the doc you mentioned, constructing a JSON response body containing response_action: push and view, plus building an HTTP response using Flask’s make_response utility method should work for you.

[seratch]

As I’ve already answered the question here, let me close this issue now. Thanks for asking the question!