code-first

I have the following two models public class Account { public int Id { get; set; } public string Name { get; set; } public int CurrentPeriodId { get; set; } [ForeignKey("CurrentPeriodId")] public virtual Period CurrentPeriod { get; set; } public virtual ICollection<Period> Periods { get; set; } } public class Period { public int Id { get; set; } public int AccountId { get; set; } public DateTime StartDate { get; set; } public DateTime EndDate { get; set; } public virtual Account Account { get; set; } } And I am trying to run the following query: from p in context.Periods where p.AccountId ==

Consider that I have an Instructor class: public class Instructor { public InstructorTypesEnum Type { get; set; } public virtual ICollection<Course> Courses { get; set; } public virtual ICollection<Course> CoInstructingCourses { get; set; } } Here, InstructorTypesEnum has two values: instructor and co-instructor. So the two navigation properties Courses and CoInstructingCourses are supposed to return those different courses. Of course I am also having difficulties specifying the coresponding properties in the Course class public Guid InstructorId { get; set; } public virtual Instructor

This question is an exact duplicate of: Entity Framework database mapping relationships (Duplicate creation using Seed() method) 1 answer EDIT---- From here i tried assigning Id's in the seeding method and this was OK for Languages but not when i added Address to the customer and assign Id's as well to these addresses, than it created the dupes again... Both Address & Language are declared as DbSet<...> in my Context What i tried: Adding 1 Address (with Id) - add this to 1 customer => Creates a dupe Adding 1 language & 1 Address (with Id's) - add both to 1 customer => Creates a dupe Adding 1

I am trying to use EF to export/import the existing database of a DbContext. In this context, there are several entities with Guid Id properties with DatabaseGeneratedOption.Identity defined by the ModelBuilder. When I re-import the entities, I want to use the Id value from the serialized object, but it always generates a new Id value when I save the changes. Is there any way to force EF to use my Id value in this case? I know DatabaseGeneratedOption.None will allow me to do it, but then I will always be responsible for generating the Id. I know there segmentation issues of the index that

I hit an issue when trying to delete records due to FK constraints. I therefore went back to the drawing board and am trying to specify how the relationship should work. Here are my code first classes: public class MemberDataSet { [Key] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public int? DeferredDataId { get; set; } [ForeignKey("DeferredDataId")] public virtual DeferredData DeferredData { get; set; } } public class DeferredData { [Key] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int Id { get; set; } //other properties