toJson method
Implementation
String toJson() {
var x = '';
var r = '';
cancelAllChanges();
_records.where((element) => element.isReady).forEach((element) {
r = '';
element.fields.forEach((field) {
r += ', ${field.toJson()}';
});
x += ', {${r.replaceFirst(', ', '')}}';
});
return '[${x.replaceFirst(', ', '')}]';
}