fromJson static method

DropRateSchema? fromJson(dynamic value)

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

Implementation

// ignore: prefer_constructors_over_static_methods
static DropRateSchema? 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'code'),
          'Required key "DropRateSchema[code]" is missing from JSON.');
      assert(json[r'code'] != null,
          'Required key "DropRateSchema[code]" has a null value in JSON.');
      assert(json.containsKey(r'rate'),
          'Required key "DropRateSchema[rate]" is missing from JSON.');
      assert(json[r'rate'] != null,
          'Required key "DropRateSchema[rate]" has a null value in JSON.');
      assert(json.containsKey(r'min_quantity'),
          'Required key "DropRateSchema[min_quantity]" is missing from JSON.');
      assert(json[r'min_quantity'] != null,
          'Required key "DropRateSchema[min_quantity]" has a null value in JSON.');
      assert(json.containsKey(r'max_quantity'),
          'Required key "DropRateSchema[max_quantity]" is missing from JSON.');
      assert(json[r'max_quantity'] != null,
          'Required key "DropRateSchema[max_quantity]" has a null value in JSON.');
      return true;
    }());

    return DropRateSchema(
      code: mapValueOfType<String>(json, r'code')!,
      rate: mapValueOfType<int>(json, r'rate')!,
      minQuantity: mapValueOfType<int>(json, r'min_quantity')!,
      maxQuantity: mapValueOfType<int>(json, r'max_quantity')!,
    );
  }
  return null;
}