Joining tables in NHibernate - nhibernate

Question

I have a query below, How can recreate this one to join the tables that will return a list of SurveyProjectNormDTO using NHibernate? Any help please?
using (var session = OpenSession()){
var projectGroupIds = session.Query<ReportingStructureNodeProjectGroups>()
.Where(x => x.NodeID == nodeId);
projectGroupIds.Fetch(x => x.ProjectGroupID).ToFuture();
var projectIds = session.Query<ProjectGroup>().Where(p => projectGroupIds.Contains(p.Id));
projectIds.Fetch(x => x.ProjectID).ToFuture();
var projectNormProjects = session.Query<SurveyProjectNorm>().Where(x => projectIds.Contains(x.SurveyProjectId));
projectNormProjects.Fetch(x => x.ShortLabels).ToFuture();
projectNormProjects.Fetch(x => x.ReportingNames).ToFuture();
projectNormProjects.Fetch(x => x.NormProject).ToFuture();
var response = new List<SurveyProjectNormDTO>();
projectNormProjects.ToList().ForEach(
p =>
{
response.Add(
new SurveyProjectNormDTO { Id = p.Id, ProjectName = p.NormProject.ProjectName, ReportingName = p.ReportingNames.Select(s => s.LocalizedText).FirstOrDefault() });
});
return response;

Answer 1

I am not sure if these let commands will work fine but you can try this. It will do a single hit on the database fetching the properties. Test it and let us know if it works.
var queryResult = (from p in session.Query<SurveyProjectNorm>()
let projectGroupIds = session.Query<ReportingStructureNodeProjectGroups>().Where(x => x.NodeID == nodeId).Select(x => x.Id)
let projectIds = session.Query<ProjectGroup>().Where(x => projectGroupIds.Contains(x.Id)).Select(x => x.Id)
where projectIds.Contains(p.SurveyProjectId)
select p)
.Fetch(x => x.ShortLabels)
.Fetch(x => x.ReportingNames)
.Fetch(x => x.NormProject)
.ToList();
var response = new List<SurveyProjectNormDTO>();
queryResult.ForEach(p =>
response.Add(new SurveyProjectNormDTO {
Id = p.Id,
ProjectName = p.NormProject.ProjectName,
ReportingName = p.ReportingNames.Select(s => s.LocalizedText).FirstOrDefault() }));
return result;