Entity Framework not binding entity - linq

Question

I have the following db structure:
I am using EF6 to create the entities from database and have the following classes created by EF6:
public partial class Mechanic
{
public Mechanic()
{
this.MechanicAddresses = new HashSet<MechanicAddress>();
this.MechanicServices = new HashSet<MechanicService>();
}
public string ID { get; set; }
public string Email { get; set; }
public bool EmailConfirmed { get; set; }
public string PasswordHash { get; set; }
public string SecurityStamp { get; set; }
public string PhoneNumber { get; set; }
public bool PhoneNumberConfirmed { get; set; }
public bool TwoFactorEnabled { get; set; }
public Nullable<System.DateTime> LockoutEndDateUtc { get; set; }
public bool LockoutEnabled { get; set; }
public int AccessFailedCount { get; set; }
public string UserName { get; set; }
public string CompanyName { get; set; }
public string ContactName { get; set; }
public string MobileNumber { get; set; }
public Nullable<bool> IsMobile { get; set; }
public string Url { get; set; }
public string FaceBookUrl { get; set; }
public string TwitterUrl { get; set; }
public string Description { get; set; }
public string Discriminator { get; set; }
public bool IsEnabled { get; set; }
public bool IsAuthorised { get; set; }
public string Logo { get; set; }
public System.DateTime CreationTimestamp { get; set; }
public virtual ICollection<MechanicAddress> MechanicAddresses { get; set; }
public virtual ICollection<MechanicService> MechanicServices { get; set; }
}
public partial class MechanicAddress
{
public int ID { get; set; }
public string MechanicId { get; set; }
public string AddressLine1 { get; set; }
public string AddressLine2 { get; set; }
public string AddressLine3 { get; set; }
public string District { get; set; }
public string Region { get; set; }
public string PostalCode { get; set; }
public int CountryId { get; set; }
public System.DateTime CreationTimestamp { get; set; }
public bool IsPrimary { get; set; }
public Nullable<double> Latitude { get; set; }
public Nullable<double> Longitude { get; set; }
public System.Data.Entity.Spatial.DbGeography Location { get; set; }
public virtual Country Country { get; set; }
public virtual Mechanic Mechanic { get; set; }
}
public partial class MechanicService
{
public int ID { get; set; }
public string MechanicId { get; set; }
public string Service { get; set; }
public virtual Mechanic Mechanic { get; set; }
}
The data is correct so i expect to get data in all entities.
When i run the following linq query in my DAL:
Mechanic mech = context.Mechanics.Where(a => a.ID == id).Include(a => a.MechanicAddresses).Include(a => a.MechanicServices).FirstOrDefault();
It returns the mechanic and mechanicAddresses but mechanicServices is always empty (count == 0).
When i run the same query in LinqPad I get all entities filled as expected.
I have removed the edmx and re-created it but still get the same issue.

Answer 1

Please check if "MultipleActiveResultSets" is set to true and LazyLoadingEnabled is enabled in connection string. It may help.

Answer 2

And what about your OnModelCreating?
protected override void OnModelCreating(DbModelBuilder modelBuilder)
It's not necessary to use Include if you have LazyLoading (virtual). And If it works fine in LinqPad try to do migration into empty DB (just test). And then try to get data from test DB.

Answer 3

The only way i was able to resolve this was to:
delete the EDMX
script the create for the mechanicsServices table
script the data
drop the mechanicsServices table
run the create table script from above
run the insert data script
regenerate the EDMX
This now works, WTF! Can't explain it.
I know it's always best to understand what went wrong but this one beat me.

Answer 4

I had same problem.
If you using git, please check .edmx file old version. SSDL content may be missing.