python runtime_error ai_generated true

sqlalchemy.exc.InvalidRequestError: Could not evaluate current criteria in Python. Specify 'fetch' or False for the synchronize_session parameter.

ID: python/sqlalchemy-unhashable-condition

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-11-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Using a bulk update/delete with a complex expression that SQLAlchemy cannot evaluate in the session, especially with certain database-specific functions.

generic

中文

在批量更新/删除中使用复杂表达式，SQLAlchemy 无法在会话中评估，尤其使用特定数据库函数时。

Workarounds

  1. 95% success 
    session.query(User).filter(User.age > 30).update({'active': False}, synchronize_session=False)
  2. 90% success 
    session.query(User).filter(User.age > 30).update({'active': False}, synchronize_session='fetch')

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Default is 'auto' which may still fail for complex criteria.

  2. 30% fail

    May bypass ORM features but not always desired.