✨ Support SQLAlchemy keyed dict models

[nkrishnaswami]

To add support for SQLAlchemy mapped collections, I'd like to add a case for dict origins to get_relationship_to. This PR does so, with a test case using a dictionary with collection class attribute_keyed_dict.

[nkrishnaswami]

Thanks, @svlandeg!

[dcode]

Any update on this? This is a great feature add that I need. For now, I'm setting the requirement to use git at this PR.

[nkrishnaswami]

@svlandeg what is the next step in the process? How do I get this to be reviewed? (Thanks!)

[svlandeg]

Hi @nkrishnaswami! It's in our review queue, so not much to be done by you at this point in time. We'll get back to you once we've had time to go through this in details 🙏

[saky-semicolon]

Good addition — the change in _compat.py improves handling of dict annotations, and the new test (test_attribute_keyed_dict.py) clearly validates the functionality with attribute_keyed_dict.

[YuriiMotov]

Looks good!

We should probably re-export sqlalchemy.orm.collections