writeRef method
Implementation
String writeRef(ClassElement e) {
final buf = StringBuffer();
buf.writeln('final $collectionRefTypeName $refName = FirebaseFirestore.instance');
buf.writeln('.collection(\'$collectionName\')');
buf.writeln('.withConverter<$className>(');
buf.writeln('fromFirestore: $fromMapFuncName,');
buf.writeln('toFirestore: $toMapFuncName,');
buf.writeln(');');
return buf.toString();
}