Wrong dependencies resolving for SQLAlchemy[postgresql_asyncpg]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: MacOS 12.2.1 on Apple M1 chip
• Poetry version: 1.1.13
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/evgen231/1cda84fbf99b826f9ed611d969fdd01e

Issue

After installing SQLAlchemy with postgresql_asyncpg extra there is no greenlet dependency.

# poetry update
Creating virtualenv example-OWA4dUH3-py3.9 in /Users/.../Library/Caches/pypoetry/virtualenvs
Updating dependencies
Resolving dependencies... (0.1s)

Writing lock file

Package operations: 2 installs, 0 updates, 0 removals

  • Installing asyncpg (0.25.0)
  • Installing sqlalchemy (1.4.35)
# poetry run pip freeze
asyncpg @ .../asyncpg-0.25.0.tar.gz
SQLAlchemy @ .../SQLAlchemy-1.4.35.tar.gz

Using pip:

# python -m pip install 'sqlalchemy[postgresql_asyncpg]'
...
# python -m pip freeze
asyncpg==0.25.0
greenlet==1.1.2
SQLAlchemy==1.4.35

[dimbleby]

I don’t see anything much to agree or disagree with…

Per this comment I do believe that it’s a bug. I’ve a half-memory of taking a closer look back then and deciding that it was likely to be painful. But I haven’t tried again and, you never know, maybe it’ll turn out to be easy.

[anentropic]

I already have sqlalchemy[asyncio] … I see greenlet in the lock file as a dependency but it does not get installed - this is the part that’s not working

but explicitly adding greenlet via poetry add greenlet does fix it for me