This repo demonstrates an issue with Upserts for SQL Server in Gorm.
To test set SQLSERVER_DSN env variable to a valid DSN for SQL Server.
Expectation: If I run this example the Data column for the TestModel with Matcher foobar should be updated to foobaz.
What happens: It throws mssql: Cannot insert duplicate key row in object 'dbo.test_models' with unique index 'idx_test_models_matcher'. The duplicate key value is (foobar). for SQL Server.
Observation: The expectation holds for the sqlite database, so the implementation seems correct.