I know that changing the shape of a query causes Entity Framework to ignore the include calls but is there a way I can get it to load the sub properties when I do a select many and a group by. In the following example I want to notify all the employees who have a job booked in a certain time period. Calling .ToArray() after the where only hits the database once but I am doing the SelectMany and GroupBy in memory. Is there a way I can get the SelectMany and the GroupBy to happen on the SQL server and still include the ServiceType and Ship and the Employee details?
I am looking for a way to make one SQL call to the database and end up with a list of Employees who have a job in the time period and the jobs they are assigned to.
var employeeJobs = DataContext.Jobs.
Include("ServiceType").
Include("Ship").
Include("JobEmployees.Employee").
Where(j => j.Start >= now && j.Start <= finish).
OrderBy(j => j.Start).
ToArray().
SelectMany(j => j.JobEmployees, (j, je) => new {
Job = j,
Employee = je.Employee
}).GroupBy(j => j.Employee);
The following should work:
var q = from e in DataContext.Employees
where e.Job.Start > ....
order by e.Job.Start
select new {Employee = e, Job = e.Job, Ship = e.Job.Ship, ServiceType = e.Job.ServiceType}; // No db hit yet.
var l = q.GroupBy(item=>item.Employee) // no db hit yet.
.ToList(); // This one causes a db hit.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With