toValue method
Implementation
String toValue() {
switch (this) {
case OperatorType.eq:
return 'eq';
case OperatorType.lt:
return 'lt';
case OperatorType.gt:
return 'gt';
case OperatorType.le:
return 'le';
case OperatorType.ge:
return 'ge';
case OperatorType.$in:
return 'in';
case OperatorType.between:
return 'between';
}
}