我有很多课程如下:
public class ModelOneConfiguration
{
public ModelOneConfiguration(EntityTypeBuilder<ModelOne> entity)
{
entity.Property(e => e.Id).IsRequired().HasDefaultValueSql("NEWID()");
entity.Property(e => e.CreatedAt).HasDefaultValueSql("getutcdate()").ValueGeneratedOnAdd();
entity.Property(e => e.UpdatedAt).HasDefaultValueSql("getutcdate()").ValueGeneratedOnUpdate();
entity.Property(e => e.FirstName).IsRequired();
entity.Property(e => e.LastName).IsRequired();
entity.Property(e => e.Email).IsRequired();
}
}
并从Db上下文类中调用它:
protected override void OnModelCreating(ModelBuilder builder)
{
new ModelOneConfiguration(builder.Entity<ModelOne>());
….other classes as well…
base.OnModelCreating(builder);
}
当我迁移它时可以正常使用以下结果:
Id = table.Column<Guid>(nullable: false, defaultValueSql: "NEWID()"),
CreatedAt = table.Column<DateTimeOffset>(nullable: false, defaultValueSql: "getutcdate()"),
UpdatedAt = table.Column<DateTimeOffset>(nullable: true, defaultValueSql: "getutcdate()"),
FirstName = table.Column<string>(nullable: false),
LastName = table.Column<string>(nullable: false),
Email = table.Column<string>(nullable: false)
到现在为止还挺好。
现在我尝试在基类中包装Id,CreatedAt和UpdatedAt,以便我可以将它与所有其他模型配置类一起使用。所以我做了什么,我跟随这个example回答了Ivan Stoev。
所以对于我的基类我做了以下
public class BaseConfiguration<TEntity> : IEntityTypeConfiguration<TEntity> where TEntity : BaseEntities
{
public virtual void Configure(EntityTypeBuilder<TEntity> entity)
{
entity.Property(e => e.Id).IsRequired().HasDefaultValueSql("NEWID()");
entity.Property(e => e.CreatedAt).HasDefaultValueSql("getutcdate()").ValueGeneratedOnAdd();
entity.Property(e => e.UpdatedAt).HasDefaultValueSql("getutcdate()").ValueGeneratedOnUpdate();
}
}
然后我扩展了我的模型configure类:
public class ModelOneConfiguration : BaseConfiguration<ModelOne>
{
public ModelOneConfiguration(EntityTypeBuilder<ModelOne> entity)
{
entity.Property(e => e.FirstName).IsRequired();
entity.Property(e => e.LastName).IsRequired();
entity.Property(e => e.Email).IsRequired();
}
}
现在当我运行迁移它生成以下内容
Id = table.Column<Guid>(nullable: false),
CreatedAt = table.Column<DateTimeOffset>(nullable: false),
UpdatedAt = table.Column<DateTimeOffset>(nullable: true),
FirstName = table.Column<string>(nullable: false),
LastName = table.Column<string>(nullable: false),
Email = table.Column<string>(nullable: false)
我们可以看到,defaultValueSql: "NEWID()"
,defaultValueSql: "getutcdate()"
在Id
,CreatedAt
和UpdatedAt
中缺失。
我正在使用带有EF核心2.2的Core 2.2。
我的问题很简单:
我做错了什么,如何解决?
你的派生类应该在Configure
方法中进行工作,而不是在构造函数中。为此添加一个override
,并确保调用基本的Configure
方法:
public class ModelOneConfiguration : BaseConfiguration<ModelOne>
{
public override void Configure(EntityTypeBuilder<ModelOne> builder)
{
base.Configure(builder);
entity.Property(e => e.FirstName).IsRequired();
entity.Property(e => e.LastName).IsRequired();
entity.Property(e => e.Email).IsRequired();
}
}