toMap method
Implementation
Map<String, dynamic> toMap() {
var body = {
"ids": ids,
"authors": authors,
"kinds": kinds,
"#e": eTags,
"#p": pTags,
"#t": tTags,
"since": since,
"until": until,
"limit": limit,
};
// remove null values
body.removeWhere((key, value) => value == null);
return body;
}