withPropertyOrder function

Map<String, dynamic> withPropertyOrder(Map<String, dynamic> schema)

Adds a propertyOrder list to every object node of a JSON-Schema-style map, taken from the insertion order of its properties.

Platform channels deliver maps without key order, and the model fills properties in schema order, so the order the caller wrote is preserved explicitly. An existing propertyOrder is kept.

Implementation

Map<String, dynamic> withPropertyOrder(Map<String, dynamic> schema) {
  final result = Map<String, dynamic>.from(schema);

  final properties = schema['properties'];
  if (properties is Map) {
    result['properties'] = {
      for (final entry in properties.entries)
        entry.key as String: entry.value is Map
            ? withPropertyOrder(Map<String, dynamic>.from(entry.value as Map))
            : entry.value,
    };
    result['propertyOrder'] ??= [
      for (final key in properties.keys) key as String,
    ];
  }

  final items = schema['items'];
  if (items is Map) {
    result['items'] = withPropertyOrder(Map<String, dynamic>.from(items));
  }

  return result;
}