Entity Framework 6 code first fluent API one to one relation with both ends required

Entity Framework 4 Code First demonstrates how to declare a one-to-one connection (POCO)

Three approaches:...A) Declare a relationship between the two classes with navigational attributes. Add the ForeignKey attribute to the Primary Key of the dependant table in one of the tables. EF deduces this to mean:...public class AppUser { public int Id { get; set; } public string Username { get; set; } public OpenIdInfo OpenIdInfo...

The First One-to-One Relationship in Entity Framework

Your execution, in my opinion, is flawed. As far as I know, EF does not allow you to define a one-to-one connection in this way.... Look at your produced database; it has an...Account_Id... column that you've specified...Periods... table. What you need to define is as follows:...public class Account { public int Id { get; set; } public stri...

Implementing Zero Or One to Zero Or One relationship in EF Code first by Fluent API

The method used by @Masoud was:...modelBuilder.Entity<Order>() .HasOptional(o => o.Quotation) .WithOptionalPrincipal() .Map(o => o.MapKey("OrderId")); modelBuilder.Entity<Quotation>() .HasOptional(o => o.Order) .WithOptionalPrincipal() .Map(o => o.MapKey("QuotationId")); ...Gi...

One to one relationship with Entity Framework Fluent API

One-to-one correspondence issue The problem is EF and CODE First when the dependent has a Primary key that refers to the principal in a 1:1 relationship. Despite the fact that a DB can be defined in numerous ways and that it even allows for OPTIONAL FK on the Primary, This constraint is initially made by EF in the Code. Fair enough, in my opinion..

How do I establish a one to one relationship with Entity Framework Code First

One-to-one connections can only be used with EF on tables that have a common primary key. Your...AccountConfig... table has a foreign key to the table's own primary key....Account... . With this configuration, EF only allows one-to-many relationships....A good description of the 1:1 and 1:0..1 connections in EF may be found in ...This piece.... The...

One to one optional relationship using Entity Framework Fluent API

Just act as though you were in a one-to-many relationship...LoyaltyUserDetail... and ...PIIUser... hence, your mapping should...modelBuilder.Entity<LoyaltyUserDetail>() .HasRequired(m => m.PIIUser ) .WithMany() .HasForeignKey(c => c.LoyaltyUserDetailId); ...The only foreign key you should need is ...not concerned with WithMany...

Solutions with one EF6 model (db first) and one code first

Okay, let's resolve this. In essence, this is impossible if a relationship is shared between the two contexts. However, it functions if you use a different connection for both....I appreciate Ben Robinson's help in directing me in the proper way.

Entity Framework Code First Fluent API configuration for one to one identifying relationship

The main key of the dependent entity must also be a foreign key to the principal entity in order for EF to execute one-to-one relationships. As a result, the dependent's PK is inherently limited to current principle PK values....Consequently, slightly adjusted using your classes:...public class Customer { public int CustomerId { get; private se...

One or Zero to One Entity Framework Code First FluentApi

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How to define a one to one self reference using Entity Framework Code First

public class Stuff { public int Id { get; set; } public int? NextVersionId { get; set; } public int? PrevVersionId { get; set; } public virtual Stuff NextVersion { get; set; } public virtual Stuff PrevVersion { get; set; } } ...Updated: ...modelBuilder.Entity<Stuff>().HasOptional(t => t.NextVersion).WithMany().HasForeignKey...