Entity Framework Code First HashSet not generating migration code

Question

• ASP.NET 4.61, EF 6.1.3
• SQL Server 2012

I have a the following POCO:

public class GdataHealthTableModel : AuditedEntity
{
    public GdataHealthTableModel()
    {
        PrevHealthAssessment = new HashSet<HealthPrevHealthAssessmentEnum>();
    }

    public HashSet<HealthPrevHealthAssessmentEnum> PrevHealthAssessment { get; set; }
}

but this does not generate a migration for the column PrevHealthAssessment . So what is the correct construct to be able to store multiple enum members so that EF "understands it" and will generate a migration?

Answer 1

You can add a new entity and name it eg PrevHealthAssessment which will have the HealthPrevHealthAssessmentEnum as a property.

public class PrevHealthAssessment
{
    public int Id { get; set; }
    public HealthPrevHealthAssessmentEnum HealthPrevHealthAssessment { get; set; }

} 

In GdataHealthTableModel , add a collection of the newly created entity like this:

public ICollection<PrevHealthAssessment> PrevHealthAssessments {get; set; }

Answer 2

You need to use the ICollection type.

 public class GdataHealthTableModel : AuditedEntity
 {
   public GdataHealthTableModel()
    {
      PrevHealthAssessment = new HashSet<HealthPrevHealthAssessmentEnum>();
    }

   public ICollection<HealthPrevHealthAssessmentEnum> PrevHealthAssessment { get; set; }
 }