fromJson static method

AggregationOperation? fromJson(dynamic value)

Returns a new AggregationOperation instance and imports its values from value if it's a Map, null otherwise.

Implementation

// ignore: prefer_constructors_over_static_methods
static AggregationOperation? fromJson(dynamic value) {
  if (value is Map) {
    final json = value.cast<String, dynamic>();

    // Ensure that the map contains the required keys.
    // Note 1: the values aren't checked for validity beyond being non-null.
    // Note 2: this code is stripped in release mode!
    assert(() {
      assert(json.containsKey(r'field'), 'Required key "AggregationOperation[field]" is missing from JSON.');
      assert(json[r'field'] != null, 'Required key "AggregationOperation[field]" has a null value in JSON.');
      assert(json.containsKey(r'op'), 'Required key "AggregationOperation[op]" is missing from JSON.');
      assert(json[r'op'] != null, 'Required key "AggregationOperation[op]" has a null value in JSON.');
      return true;
    }());

    return AggregationOperation(
      field: mapValueOfType<String>(json, r'field')!,
      op: AggregationOpType.fromJson(json[r'op'])!,
      alias: mapValueOfType<String>(json, r'alias'),
      expandArray: mapValueOfType<bool>(json, r'expandArray'),
    );
  }
  return null;
}