Fix update relationship

[CosmoV]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.79%. Comparing base (39d995b) to head (651172e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   78.75%   78.79%   +0.04%     
==========================================
  Files          40       40              
  Lines        2537     2542       +5     
  Branches      374      376       +2     
==========================================
+ Hits         1998     2003       +5     
  Misses        467      467              
  Partials       72       72              

Flag	Coverage Δ
unittests	78.79% <100.00%> (+0.04%)	⬆️

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Files	Coverage Δ
fastapi_jsonapi/data_layers/sqla_orm.py	78.82% <100.00%> (+0.31%)	⬆️