假设我有以下实体:
Box
Id
Crank crank // has one required relationship
Crank
Id // does not care about the box
定义BoxMap的正确方法是什么?这够了吗?或者我需要WithRequiredPrincipal
(我不知道那是什么):
HasKey(t => t.Id);
ToTable("Boxes")
Property(t=>t.Id).HasColumnName("Id")
Property(t=>t.CrankId).HasColumnName("Crank_Id")
HasRequired(t=>t.Crank)
注意:欢迎学习流利api的任何好资源。感谢。
答案 0 :(得分:3)
public class Context : DbContext
{
public DbSet<Box> Boxes { get; set; }
public DbSet<Crank> Cranks { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Box>()
.HasRequired(m => m.Crank)
.WithOptional()
.Map(m => m.MapKey("Crank_Id"));
base.OnModelCreating(modelBuilder);
}
}
public class Box
{
public int Id { get; set; }
public Crank Crank { get; set; } // has one required relationship
}
public class Crank
{
public int Id { get; set; }
}
您无需指定:
HasKey(t => t.Id);
ToTable("Boxes")
Property(t=>t.Id).HasColumnName("Id")
Property(t=>t.CrankId).HasColumnName("Crank_Id")
HasRequired(t=>t.Crank)
将通过EF的惯例检测。