ef-fluent-api

When creating a database using Entity Framework code-first, a lot of the database model is can be extracted from the code. Fluent API and/or Attributes can be used to fine tune the model. What are the advantages and disadvantages of Fluent Api in comparison to Data Annotations? In other words: Even if in certain situations both methods can be used, in what cases should one method prevail above the other? Everything what you can configure with DataAnnotations is also possible with the Fluent API. The reverse is not true. So, from the viewpoint of configuration options and flexibility the Fluent

I'm trying to build an EF Entity with Code First, and an EntityTypeConfiguration using fluent API. creating primary keys is easy but not so with a Unique Constraint. I was seeing old posts that suggested executing native SQL commands for this, but that seem to defeat the purpose. is this possible with EF6? Yorro On EF6.2 , you can use HasIndex() to add indexes for migration through fluent API. https://github.com/aspnet/EntityFramework6/issues/274 Example modelBuilder .Entity<User>() .HasIndex(u => u.Email) .IsUnique(); On EF6.1 onwards, you can use IndexAnnotation() to add indexes for

We want to use one to one optional relationship using Entity Framework Code First. We have two entities. public class PIIUser { public int Id { get; set; } public int? LoyaltyUserDetailId { get; set; } public LoyaltyUserDetail LoyaltyUserDetail { get; set; } } public class LoyaltyUserDetail { public int Id { get; set; } public double? AvailablePoints { get; set; } public int PIIUserId { get; set; } public PIIUser PIIUser { get; set; } } PIIUser may have a LoyaltyUserDetail but LoyaltyUserDetail must have a PIIUser . We tried these fluent approach techniques. modelBuilder.Entity<PIIUser>()

I have seen lots of examples in LINQ to SQL examples on how to do a join in query syntax but I am wondering how to do it with method syntax? For example how might I do the following var result = from sc in enumerableOfSomeClass join soc in enumerableOfSomeOtherClass on sc.Property1 equals soc.Property2 select new { SomeClass = sc, SomeOtherClass = soc } with a .Join() ? Can anyone illustrate or provide another simple example? Justin Niessner var result = from sc in enumerableOfSomeClass join soc in enumerableOfSomeOtherClass on sc.Property1 equals soc.Property2 select new { SomeClass = sc,