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2.0.22

Released: October 12, 2023

orm

• [orm] [usecase] Added method _orm.Session.get_one() that behaves like _orm.Session.get() but raises an exception instead of returning None if no instance was found with the provided primary key. Pull request courtesy of Carlos Sousa.

  References: #10202

• [orm] [usecase] Added an option to permanently close sessions. Set to False the new parameter _orm.Session.close_resets_only will prevent a _orm.Session from performing any other operation after _orm.Session.close() has been called.

  Added new method _orm.Session.reset() that will reset a _orm.Session to its initial state. This is an alias of _orm.Session.close(), unless _orm.Session.close_resets_only is set to False.

  References: #7787

• [orm] [bug] Fixed a wide range of _orm.mapped_column() parameters that were not being transferred when using the _orm.mapped_column() object inside of a pep-593 Annotated object, including _orm.mapped_column.sort_order, _orm.mapped_column.deferred, _orm.mapped_column.autoincrement, _orm.mapped_column.system, _orm.mapped_column.info etc.

  Additionally, it remains not supported to have dataclass arguments, such as _orm.mapped_column.kw_only, _orm.mapped_column.default_factory etc. indicated within the _orm.mapped_column() received by Annotated, as this is not supported with pep-681 Dataclass Transforms. A warning is now emitted when these parameters are used within Annotated in this way (and they continue to be ignored).

  References: #10046, #10369

• [orm] [bug] Fixed issue where calling _engine.Result.unique() with a new-style select() query in the ORM, where one or more columns yields values that are of "unknown hashability", typically when using JSON functions like func.json_build_object() without providing a type, would fail internally when the returned values were not actually hashable. The behavior is repaired to test the objects as they are received for

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