I am making an e-commerce app to try and learn .NET 7. I set up the models and database connection the first time and everything worked great. After I continued to develop the back-end, I added another migration and tried to update the database, but this error showed up:
System.NullReferenceException: Object reference not set to an instance of an object.
at MySql.EntityFrameworkCore.Migrations.MySQLMigrationsSqlGenerator.Generate(RenameColumnOperation operation, IModel model, MigrationCommandListBuilder builder) at Microsoft.EntityFrameworkCore.Migrations.MigrationsSqlGenerator.<>c.<.cctor>b__82_22(MigrationsSqlGenerator g, MigrationOperation o, IModel m, MigrationCommandListBuilder b) at Microsoft.EntityFrameworkCore.Migrations.MigrationsSqlGenerator.Generate(MigrationOperation operation, IModel model, MigrationCommandListBuilder builder) at MySql.EntityFrameworkCore.Migrations.MySQLMigrationsSqlGenerator.Generate(MigrationOperation operation, IModel model, MigrationCommandListBuilder builder) at Microsoft.EntityFrameworkCore.Migrations.MigrationsSqlGenerator.Generate(IReadOnlyList`1 operations, IModel model, MigrationsSqlGenerationOptions options) at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.GenerateUpSql(Migration migration, MigrationsSqlGenerationOptions options) at MySql.EntityFrameworkCore.Migrations.Internal.MySQLMigrator.GenerateUpSql(Migration migration, MigrationsSqlGenerationOptions options) at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.<>c__DisplayClass16_2.<GetMigrationCommandLists>b__2() at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration) at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.<>c__DisplayClass16_2.<GetMigrationCommandLists>b__2() at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String connectionString, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String connectionString, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
I tried removing a migration and adding a new one. I tried deleting and creating the model snapshot and the same error persists. I don't really understand the error as well. Is it saying that there's a problem with my model entities or what?
When updating the database with the --verbose setting, this is what it shows right before the error above occurs
Applying migration '20230930105241_FinalMigration'.
'DataContext' disposed.
Disposing connection to database 'ecommerce' on server 'localhost'.
Disposed connection to database 'ecommerce' on server 'localhost' (2ms).```