python data_error ai_generated true

sqlalchemy.orm.exc.MultipleResultsFound: Multiple rows were found for one()

ID: python/sqlalchemy-orm-exc-multiple-results-found

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-09-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Using the .one() method when the query returns more than one row, which expects exactly one result.

generic

中文

使用 .one() 方法但查询返回了多行，该方法期望恰好一个结果。

Workarounds

  1. 90% success Use one_or_none() method 
    Use .one_or_none() to handle zero or one result, then check for None.
  2. 95% success Add unique constraints to query 
    Refine the query with additional filters to ensure uniqueness, e.g., filter by primary key.

Dead Ends

Common approaches that don't work:

  1. Using .first() without addressing duplicates 70% fail

  2. Adding LIMIT 1 to query 50% fail