Dart APIunself_local_databaseCollectionFromOrm CollectionFromOrm extension Null safety on CollectionOrm Methods toData() → CollectionData unself_local_database unself_local_database CollectionFromOrm extension unself_local_database library Classes $CollectionTable $FieldTable Collection CollectionCompanion CollectionDao CollectionData CollectionOrm DocumentDao Field FieldCompanion FieldData ListConverter LocalDatabase MapConverter Extensions CollectionFromDomain CollectionFromOrm CollectionToOrm FieldFromDomain FieldFromOrm FieldToOrm Methods toData