Question

EF CORE Fluent Api配置在单独的文件中可以很好地与简单的类Ref #1 && Ref # 2一起使用。问题是从KeyedEntity或AuditableEntity

继承实体时出现的

class abstract KeyedEntity<TValue> {
      public TValue Id {get; set;}
}

class abstract  AuditableEntity<TValue> : KeyedEntityBase<TValue>{
      public DateTime DateCreated {get; set;}
      public DateTime DateModified {get; set;}
}

地图制作者会这样

public class KeyedEntityMap<TEntity, TId>
    : IEntityTypeConfiguration<TEntity> where TEntity
    : KeyedEntityBase<TId> where TId : struct
{
    public void Configure(EntityTypeBuilder<TEntity> builder)
    {
        // Primary Key
        builder.HasKey(t => t.Id);

        // Properties
        builder.Property(t => t.Id).HasColumnName("id").ValueGeneratedOnAdd();
    }
}

public class AuditableEntityMap<TEntity, TId>
    : IEntityTypeConfiguration<TEntity>    where TEntity 
    : AuditableEntity<TId>    where TId : struct
{
    public void Configure(EntityTypeBuilder<TEntity> builder)
    {
        // Properties
        builder.Property(t => t.DateCreated).HasColumnName("DateCreated");
        builder.Property(t => t.DateModified).HasColumnName("DateModified");           
    }
}

现在问题发生在继承自AuditableEntity的实体上。我需要从{Special Enitity}类和AuditableEntityMap类中注册Map。

现在，我可以忘记Map继承，而将所有复杂的继承Maps合并到实体类中，我不想这样做并且尊重DRY 。 复杂继承的问题在于它没有注册我的实体地图

Answer 1

有几种方法可以实现基本实体配置的DRY。

最接近当前设计的地方是简单地遵循配置类中的实体层次结构：

public class KeyedEntityMap<TEntity, TId> : IEntityTypeConfiguration<TEntity>
    where TEntity : KeyedEntityBase<TId>
    where TId : struct
{
    public virtual void Configure(EntityTypeBuilder<TEntity> builder)
    //       ^^^
    {
        // Primary Key
        builder.HasKey(t => t.Id);

        // Properties
        builder.Property(t => t.Id).HasColumnName("id").ValueGeneratedOnAdd();
    }
}

public class AuditableEntityMap<TEntity, TId> : KeyedEntityMap<TEntity, TId>
    //                                                 ^^^
    where TEntity : AuditableEntity<TId>
    where TId : struct
{
    public override void Configure(EntityTypeBuilder<TEntity> builder)
    //       ^^^
    {
        base.Configure(builder); // <<<
        // Properties
        builder.Property(t => t.DateCreated).HasColumnName("DateCreated");
        builder.Property(t => t.DateModified).HasColumnName("DateModified");           
    }
}

，然后针对需要其他配置的特定实体：

public class Person : AuditableEntity<int>    
{
    public string Name { get; set; }
}

您要注册

public class PersonEntityMap : AuditableEntityMap<Person, int>
{
    public override void Configure(EntityTypeBuilder<Person> builder)
    {
        base.Configure(builder);
        // Properties
        builder.Property(t => t.Name).IsRequired();
        // etc...
    }
}

带有继承的EF Core Fluent API配置

1 个答案: