DatumSchemaReader<E extends DatumEntityInterface> class final

Reads field values out of one raw map with precise, field-named errors — the as-cast-free way to implement fromMap:

factory Task.fromMap(Map<String, dynamic> map) {
  final r = taskSchema.reader(map);
  return Task(id: r(idField), title: r(TaskFields.title), due: r.maybe(TaskFields.due));
}

Constructors

DatumSchemaReader(String schemaName, Map<String, dynamic> raw)

Properties

hashCode → int
The hash code for this object.
no setterinherited
raw → Map<String, dynamic>
The raw map being read.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
schemaName → String
The owning schema's name, used in error messages.
final

Methods

call<V>(DatumFieldSpec<E, V> field) → V
Shorthand for get: r(TaskFields.title).
get<V>(DatumFieldSpec<E, V> field) → V
The decoded value of field; throws SchemaReadException on a missing key (for non-nullable fields), a null value, or a decode failure.
getOr<V>(DatumFieldSpec<E, V> field, V fallback) → V
Like get, but returns fallback when the key is absent or null.
maybe<V>(DatumFieldSpec<E, V> field) → V?
Like get, but returns null when the key is absent or null.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited