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EFCorePossibleBug

EF Core possible bug reproduction mini project.

Prerequisites:
.NET 5.0

Project uses an SQLite database. If you wish to inspect it, I recommend downloading DB Browser for SQLite https://sqlitebrowser.org/dl/

Install dotnet-ef CLI if you do not have it already:
dotnet tool install --global dotnet-ef

Please follow these steps to reproduce the issue:

  1. Run these commands:
    dotnet ef migrations add InitialMigration
    dotnet ef database update
    dotnet run - this will insert one item into db.
    The state of the Offers table should be:

     Id           Score_Score 
     someGuid   14.0        

  2. Comment out the code marked with "! Comment out (step 2)" in Model.cs.

  3. Uncomment the code marked with "! Uncomment (step 3)" in Model.cs and Program.cs.

  4. Run:
    dotnet ef migrations add ScoreComponents
    dotnet ef database update
    The state of the Offers table should now be:

     Id           Score_Score   Score_DeliveryTypeScore 
    someGuid  14.0          NULL                    

  5. Run dotnet run or debug the project and you should recieve the error resulting from the whole
    Score owned entity being null, although one of its properties Score_Score has value.

This issue can be reproduced with any number of properties that have some value - as long as one of them is null, the whole owned entity object is returned as null.