Entity Framework - Database First - Invalid column name error - entity-framework-6

Question

I have three simple classes and I am wiring up EF6 to an existing database.
Classes are as follows
namespace Infrastructure.Models
{
[Table("Applications")]
public class Application
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public Guid ApplicationID { get; set; }
public DateTime DateTime { get; set; }
public string CompletedZipFileURL { get; set; }
public virtual BusinessInfo BusinessInfo { get; set; }
public Application()
{
this.ApplicationID = Guid.NewGuid();
this.DateTime = DateTime.Now;
this.CompletedZipFileURL = string.Empty;
this.BusinessInfo = new BusinessInfo();
this.BusinessInfo.ApplicationID = this.ApplicationID;
}
}
[Table("BusinessInfo")]
public class BusinessInfo
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public Guid BusinessID { get; set; }
public Guid ApplicationID { get; set; }
public string BusinessName { get; set; }
public string BusinessType { get; set; }
public string StreetAddress { get; set; }
public string City { get; set; }
public string State { get; set; }
public string Zip { get; set; }
public string BusinessTelephone { get; set; }
public string FEIN { get; set; }
public string ILSalesTaxNo { get; set; }
public string IncorporateDate { get; set; }
public virtual ApplicantInfo ApplicantInfo {get;set;}
public BusinessInfo()
{
this.BusinessID = Guid.NewGuid();
this.ApplicantInfo = new ApplicantInfo();
this.ApplicantInfo.BusinessID = this.BusinessID;
}
}
public class ApplicantInfo
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public Guid ApplicantID { get; set; }
public Guid BusinessID { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public string HomeAddress { get; set; }
public string City { get; set; }
public string State { get; set; }
public string Zip { get; set; }
public string EmailAddress { get; set; }
public string PhoneNo { get; set; }
public string Criminal { get; set; }
public ApplicantInfo()
{
this.ApplicantID = Guid.NewGuid();
}
}
}
My Context Class looks like the following:
public class SIDEntities : DbContext
{
public SIDEntities() : base(Settings.GetSetting("ConnectionString"))
{
base.Configuration.ProxyCreationEnabled = false;
base.Configuration.LazyLoadingEnabled = false;
}
public virtual DbSet<Infrastructure.Models.Application> Application { get; set; }
public virtual DbSet<Infrastructure.Models.BusinessInfo> BusinessInfo { get; set; }
public virtual DbSet<Infrastructure.Models.ApplicantInfo> ApplicantInfo { get; set; }
}
On my existing database, I have the following table names and fields:
Applications (ApplicationID : uniqueidentifier, DateTime : datetime, CompletedZipFileURL : varchar(500))
BusinessInfo (BusinessID : uniqueidentifier, ApplicationID : uniqueidentifier,...)
ApplicationInfo (ApplicantID : uniqueidentifier, BusinessID : uniqueidentifier, ...)
For some reason, as soon as I attempt to do a query against the root Application POCO, I am receiving an error to the effect of "{"Invalid column name 'BusinessInfo_BusinessID'."}".
I have attempted to debug this issue checking out various SO posts but the examples/fixes don't apply to my database first scenario.
The query that is throwing the exception is:
public static Infrastructure.Models.Application Find(Guid id)
{
using (SIDEntities cntx = new SIDEntities())
{
Infrastructure.Models.Application x = new Infrastructure.Models.Application();
//the line below is where the error occurs
x = cntx.Application.Where(m => m.ApplicationID == id).SingleOrDefault();
return x;
}
}
I can see while debugging that the query being generated from LINQ is as follows
SELECT 1 AS [C1],
[Extent1].[ApplicationID] AS [ApplicationID],
[Extent1].[DateTime] AS [DateTime],
[Extent1].[CompletedZipFileURL] AS [CompletedZipFileURL],
[Extent1].[BusinessInfo_BusinessID] AS [BusinessInfo_BusinessID]
FROM [dbo].[Applications] AS [Extent1]
I understand WHY I am getting the error back and that is because there is no "BusinessInfo_BusinessID" column in the Applications table.
I would greatly appreciate any help/pointers that I could get on this one.

Answer 1

Check this out
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public Guid BusinessID { get; set; }
In your query, change Where and SingleOrDefault to:
x = cntx.Application.SingleOrDefault(m => m.ApplicationID == id);
Hope it helps

Answer 2

I have discovered that because I had a one-to-one relationship (that doesn't technically exist on the SQL server, I had to add a foreign key annotation underneath the [Key] property as noted:
Entity Framework 6: one-to-one relationship with inheritance
and
http://www.entityframeworktutorial.net/entity-relationships.aspx