toJson method
Serializes to json object
Implementation
Map<String, Object?> toJson() {
final json = <String, Object?>{};
final groupOperators = _groupOperators.map((it) => '$it');
if (groupOperators.contains(operator)) {
// Filters with group operators are encoded in the following form:
// { $<operator>: [ <filter 1>, <filter 2> ] }
json[operator!] = value;
} else if (operator != null) {
// Normal filters are encoded in the following form:
// { key: { $<operator>: <value> } }
json[key!] = {operator: value};
} else if (key != null) {
json[key!] = value;
} else {
return value as Map<String, Object?>;
}
return json;
}