LINQ query with sub-query list - asp.net-mvc

Question

The query below should be selecting a list of information from different tables, and should also bring back a list of VehicleNames that are related to each ID coming back from db.Reservations
The query brings back data, but the list of VehicleNames only has one record, and it should bring back anywhere up to 5 records, depending on how many vehicles were reserved for that specific instance. I have tried adding a foreach to the VehicleName line in the select but I don't think I am using it right. Does anyone have any ideas as to how I can retrieve the list of values I need?
var query = from r in db.Reservations
let e = db.Employees.Where(x => r.RequestorID == x.ColleagueID).FirstOrDefault()
let rtv = db.ReservationToVehicle.Where(x => r.ID == x.ReservationID).FirstOrDefault()
let rs = db.ReservationStatus.Where(x => r.ID == x.ReservationID).FirstOrDefault()
let rst = db.ReservationStatusTypes.Where(x => rs.ReservationStatusTypeID == x.ID).FirstOrDefault()
select new
{
StartDate = r.StartDate,
EndDate = r.EndDate,
Destination = r.Destination,
PurposeOfTrip = r.PurposeOfTrip,
TransportingStudents = r.TransportStudentsFG,
EmployeeName = e.FirstName + " " + e.LastName,
ApprovalStatus = rst.StatusType,
ThemeColor = r.ThemeColor,
VehicleName = (from v in db.Vehicles
where v.ID == rtv.VehicleID
select v.VehicleName).ToList()
};
EDIT: Updated query, still uncertain how to get back list of Vehicles that have been reserved
var query = from r in db.Reservations
let e = db.Employees.Where(x => r.RequestorID == x.ColleagueID).FirstOrDefault()
let rtv = db.ReservationToVehicle.Where(x => r.ID == x.ReservationID).Select(y => y.VehicleID).ToList()
let rs = db.ReservationStatus.Where(x => r.ID == x.ReservationID).FirstOrDefault()
let rst = db.ReservationStatusTypes.Where(x => rs.ReservationStatusTypeID == x.ID).FirstOrDefault()
select new
{
StartDate = r.StartDate,
EndDate = r.EndDate,
Destination = r.Destination,
PurposeOfTrip = r.PurposeOfTrip,
TransportingStudents = r.TransportStudentsFG,
EmployeeName = e.FirstName + " " + e.LastName,
ApprovalStatus = rst.StatusType,
ThemeColor = r.ThemeColor,
VehicleName = (from v in db.Vehicles
where v.ID == rtv.VehicleID
select v.VehicleName).ToList()
};
rtv.VehicleID does not exist anymore, now rtv comes back with a list of IDs....I need to be able to get into that list to find where v.ID is IN the rtv list

Answer 1

Looks like people already told you this in the comments, but here's the code that ought to work:
var query = from r in db.Reservations
let e = db.Employees.Where(x => r.RequestorID == x.ColleagueID).FirstOrDefault()
let rtv = db.ReservationToVehicle.Where(x => r.ID == x.ReservationID).Select(y => y.VehicleID)
let rs = db.ReservationStatus.Where(x => r.ID == x.ReservationID).FirstOrDefault()
let rst = db.ReservationStatusTypes.Where(x => rs.ReservationStatusTypeID == x.ID).FirstOrDefault()
select new
{
StartDate = r.StartDate,
EndDate = r.EndDate,
Destination = r.Destination,
PurposeOfTrip = r.PurposeOfTrip,
TransportingStudents = r.TransportStudentsFG,
EmployeeName = e.FirstName + " " + e.LastName,
ApprovalStatus = rst.StatusType,
ThemeColor = r.ThemeColor,
VehicleName = (from v in db.Vehicles
where rtv.Contains(v.ID)
select v.VehicleName).ToList()
};
I'd also recommend looking at setting up navigation properties between your entities. Your query could be much simpler, something like this:
var query = from r in db.Reservations
let e = r.Requestor
let rs = r.ReservationStatus
let rst = rs.ReservationStatusType
select new
{
StartDate = r.StartDate,
EndDate = r.EndDate,
Destination = r.Destination,
PurposeOfTrip = r.PurposeOfTrip,
TransportingStudents = r.TransportStudentsFG,
EmployeeName = e.FirstName + " " + e.LastName,
ApprovalStatus = rst.StatusType,
ThemeColor = r.ThemeColor,
VehicleName = r.Vehicles.Select(v => v.VehicleName).ToList()
};