encodeKeyed method
Starts encoding a keyed collection or key-value pairs for the given key or id.
The returned KeyedEncoder should be used to encode the key-value pairs. The KeyedEncoder.end method should be called when all key-value pairs have been encoded.
Implementation
@override
KeyedEncoder encodeKeyed(String key, {int? id}) {
throw CodableException.unsupportedMethod('CsvKeyedEncoder', 'encodeKeyed',
reason: 'The csv format does not support nested objects.');
}