How to configure a one-to-many relationship?

Fluent API:

modelBuilder.Entity<Blog>()

.HasMany(b => b.Posts)

.WithOne(p => p.Blog)

.HasForeignKey(p => p.BlogId);

Data annotations:

public class Post

public int BlogId { get; set; }

[ForeignKey("BlogId")]

public Blog Blog { get; set; }

• A foreign key exists in the many-side entity (Post).
• EF infers this relationship from navigation + FK.