toJson method
Implementation
Map<String, Object?> toJson() {
var expression = this.expression;
var filter = this.filter;
var value = this.value;
final json = <String, Object?>{};
if (expression != null) {
json[r'expression'] = expression;
}
if (filter != null) {
json[r'filter'] = filter.toJson();
}
if (value != null) {
json[r'value'] = value;
}
return json;
}