Sending data to other class is getting null in flutter dart - flutter

Question

I am using model to convert data to map. When I pass value to the model from class A it returns a map and then I am passing the returned value (Map) to class B. Before sending the valuing I am printing value in class A (It is showing data) but in class B it is showing null. here is class A function.
///Dummy Data remove later
jobPostModel = JobPostModel(
jobPost: 'Web design',
);
var data = jobPostModel.toJob(jobPostModel);
print('before $data');
JobPostScreen8(data);
Here is Model class function which is returning Map
class JobPostModel {
String jobPost;
JobPostModel(
{this.jobPost});
Map toJob(JobPostModel info){
var data = Map<String, dynamic>();
data['jobPost'] = info.jobPost;
return data;
}
factory JobPostModel.fromJob(Map<String, dynamic> data){
return JobPostModel(
jobPost: data['jobPost']
);
}
}
and here is other class where i must display data but it is showing null
class JobPostScreen8 extends StatefulWidget {
Map jobPostModelMapData;
JobPostScreen8([this.jobPostModelMapData]);
#override
_JobPostScreen8State createState() => _JobPostScreen8State();
}
class _JobPostScreen8State extends State<JobPostScreen8> {
#override
void initState() {
super.initState();
print('after ${widget.jobPostModelMapData}');
}
}

Answer 1

The solution is I was passing directly to class B. All I need is to use Navigation.
BlocListener<JobBloc, JobState>(
listener: (context, state) {
if (state is JobSuccessfulState)
Navigator.of(context)
.push(MaterialPageRoute(builder: (_) => JobPostScreen8(state.data)));
})
here is Bloc
if (event is PreviewPostJob) {
yield JobSuccessfulState(_updateModel());
}
and state
class JobSuccessfulState extends JobState {
var data;
JobSuccessfulState([this.data]);
}