ManualMigration constructor

ManualMigration({
  1. required int version,
  2. required String description,
  3. required MigrationCallback onUp,
  4. MigrationCallback? onDown,
})

Create a manual migration with callbacks

version - Migration version number description - Human-readable description onUp - Callback for up migration onDown - Callback for down migration (optional)

Implementation

ManualMigration({
  required int version,
  required String description,
  required this.onUp,
  this.onDown,
}) : _version = version,
     _description = description;