Sourced from sqlalchemy's releases.

2.0.24

Released: December 28, 2023

orm

• [orm] [bug] Improved a fix first implemented for #3208 released in version 0.9.8, where the registry of classes used internally by declarative could be subject to a race condition in the case where individual mapped classes are being garbage collected at the same time while new mapped classes are being constructed, as can happen in some test suite configurations or dynamic class creation environments. In addition to the weakref check already added, the list of items being iterated is also copied first to avoid "list changed while iterating" errors. Pull request courtesy Yilei Yang.

  This change is also backported to: 1.4.51

  References: #10782

• [orm] [bug] Fixed issue where use of _orm.foreign() annotation on a non-initialized _orm.mapped_column() construct would produce an expression without a type, which was then not updated at initialization time of the actual column, leading to issues such as relationships not determining use_get appropriately.

  References: #10597

• [orm] [bug] Improved the error message produced when the unit of work process sets the value of a primary key column to NULL due to a related object with a dependency rule on that column being deleted, to include not just the destination object and column name but also the source column from which the NULL value is originating. Pull request courtesy Jan Vollmer.

  References: #10668

• [orm] [bug] Modified the __init_subclass__() method used by _orm.MappedAsDataclass, _orm.DeclarativeBase and _orm.DeclarativeBaseNoMeta to accept arbitrary **kw and to propagate them to the super() call, allowing greater flexibility in arranging custom superclasses and mixins which make use of __init_subclass__() keyword arguments. Pull request courtesy Michael Oliver.

  References: #10732

• [orm] [bug] Ensured the use case of Bundle objects used in the returning() portion of ORM-enabled INSERT, UPDATE and DELETE statements is tested and works fully. This was never explicitly implemented or

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