1.4.51

1.4.51

Released: January 2, 2024

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.

  References: #10782

asyncio

• [asyncio] [bug] Fixed critical issue in asyncio version of the connection pool where
  calling _asyncio.AsyncEngine.dispose() would produce a new connection
  pool that did not fully re-establish the use of asyncio-compatible mutexes,
  leading to the use of a plain threading.Lock() which would then cause
  deadlocks in an asyncio context when using concurrency features like
  asyncio.gather().

  References: #10813

mysql

• [mysql] [bug] Fixed regression introduced by the fix in ticket #10492 when using
  pool pre-ping with PyMySQL version older than 1.0.

  References: #10650