Testing ASP.NET Core series: fixed seed IDs so the app starts on EF Core 10 - #2253
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vladimir-pecanac-main merged 1 commit intoSep 27, 2026
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…ore 10
Every folder seeded its two employees with Guid.NewGuid() in HasData, so on
EF Core 9 and later the app's startup Migrate() threw PendingModelChangesWarning
("The model for context 'EmployeeContext' changes each time it is built") and
never reached the database. The tests stayed green because they skip migrations.
The seed rows now use the GUIDs the InitialMigration and the model snapshot
already record (Mark 07e57250-..., Evelin 195430d1-...), the same values in all
six folders. Nothing else changes.
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All six folders of
dotnet-testing/AspNetCoreTestingSeriesseeded their two employees withGuid.NewGuid()inHasData. On EF Core 9 and later that makes the app's startupMigrate()throwPendingModelChangesWarning("The model for context 'EmployeeContext' changes each time it is built") before it connects, soEmployeesAppcould not start against SQL Server in any folder. The tests stayed green because they never run migrations.The fix replaces the two random IDs with the GUIDs the
InitialMigrationandEmployeeContextModelSnapshotalready record, the same values in every folder:07e57250-5443-4bdc-be13-59239ada918e195430d1-9227-451e-8378-65df427be580Nothing else changes (12 lines in six
EmployeeContext.csfiles).Checked locally on .NET SDK 10.0.302, EF Core 10.0.11:
StartingProjectagainst SQL Server Express: before the change the app dies with the warning above; after it,InitialMigrationapplies, both rows land with those IDs, and/Employees/Indexreturns 200 listing Mark and Evelin.