DatumQueryField<E, V> class

A type-safe field descriptor for an entity of type E whose value type is V.

Used with DatumQueryBuilder.whereField / DatumQueryBuilder.orderByField to get compile-time checking of both the field's existence (it must belong to E) and the comparison value's type (it must be a V). The datum_generator emits one descriptor per serializable field, e.g.:

abstract class TaskFields {
  static const title = DatumQueryField<Task, String>('title');
  static const priority = DatumQueryField<Task, int>('priority');
}

// priority must be compared to an int — `isGreaterThan: 'x'` won't compile:
query.whereField(TaskFields.priority, isGreaterThan: 2);

Named DatumQueryField (not DatumField) to avoid clashing with the @DatumField annotation from datum_generator.