toJson method
Implementation
Map toJson(){
Map _result = {};
if (databaseID != null) _result.addAll({"databaseID": databaseID});
if (version != null) _result.addAll({"version": version});
if (date != null) _result.addAll({"date": date});
if (databaseDescription != null) _result.addAll({"databaseDescription": databaseDescription});
if (countriesNumber != null) _result.addAll({"countriesNumber": countriesNumber});
if (documentsNumber != null) _result.addAll({"documentsNumber": documentsNumber});
if (size != null) _result.addAll({"size": size});
return _result;
}