python data_error ai_generated true

sqlalchemy.orm.exc.NoResultFound: No row was found for one()

ID: python/sqlalchemy-orm-exc-no-result-found

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
0Evidence
2025-04-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Using .one() method when the query returns no rows, which expects exactly one result.

generic

中文

使用 .one() 方法但查询未返回任何行，该方法期望恰好一个结果。

Workarounds

  1. 95% success Use one_or_none() with None check 
    Use .one_or_none() and handle None explicitly, e.g., user = session.query(User).filter_by(id=1).one_or_none().
  2. 85% success Use first() method 
    Use .first() if only the first result is needed, but be aware of potential multiple rows.

Dead Ends

Common approaches that don't work:

  1. Using scalar() instead 60% fail

  2. Assuming default value exists 50% fail