Cannot return null for non-nullable field Subscription.count

[vkholodov]

I have same issue as in #2756. Can't make work simple subscription example from strawberry docs.

System Information

• Operating system: Ubuntu 18.04.6 LTS
• Strawberry version (if applicable): 0.217.1
• Python version 3.11.3

Additional Context

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[patrick91]

hi @vkholodov! Is that postman?

[vkholodov]

@patrick91 Yes, it is.

[patrick91]

@vkholodov can you try with this guide? https://blog.postman.com/how-to-use-graphql-subscriptions/

the screenshot makes me thing it's doing a POST request and not a WS

(maybe we should do a better error in that case)

[vkholodov]

After your question I tried graphiql web app and it works. Trying to figure out what's wrong with postman request.

[erikwrede]

Maybe we can work on improving the error message in the web view here. Especially with regard to SSE/Multipart Subscriptions, indicating that a wrong / unsupported method is used will be a valuable addition.