Nested LINQ returning a this method cannot be translated into a store expression exception

Question

The following LINQ:

retval = ( from jm in entities.JobMasters
                 where jm.UserId == userId && jm.IsRemote == false
                 sel         


        

Answer 1

Don't call ToList on the inner query (the one for JobDetails). The error is "This .ToList method you speak of -- it can't be translated to T-SQL!"

This should work:

retval = ( from jm in entities.JobMasters
             where jm.UserId == userId && jm.IsRemote == false
             select new JobDto
             {
                 JobMasterId = jm.JobMasterId,
                 ExternalTaskId = jm.ExternalTaskId,
                 JobDetails =   from jd in entities.JobDetails
                                where jd.JobMasterId == jm.JobMasterId
                                select new JobDetailDto { ScreenFieldId = jd.ScreenFieldId, FieldValue = jd.FieldValue }
                 )
             }
        ).ToList();

Note that you can call ToList on the end of the query, as that part doesn't need to be translated to T-SQL.