OwnsOne从表键中删除身份

问题描述 投票:3回答:1

我已经创建了一个订单实体,现在我有一个Money类型,我想将其作为自己的类型包括在我的Order实体中。

public class Money
{
    public decimal Value { get; set; }

    public Currency Currency { get; set; }
}

并且我的Order类类似于以下内容

public class Order
{
   [Key]
   public long OrderId { get; set; }
}

现在我要向订单实体添加货币类型,如下所示:

public class Order
{
    [Key]
    public long OrderId { get; set; }
    public Money Amount { get; set; }
}

并且OrderContext如下所示:

 protected override void OnModelCreating(ModelBuilder modelBuilder)
 {
     modelBuilder.Entity<Order>().OwnsOne(o => o.Amount);
 }

该问题在我运行实体框架迁移时发生。这是运行迁移后得到的:

protected override void Up(MigrationBuilder migrationBuilder)
  {
      migrationBuilder.AlterColumn<long>(
          name: "OrderId",
          table: "Order",
          nullable: false,
          oldClrType: typeof(long),
          oldType: "bigint")
          .OldAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);

      migrationBuilder.AddColumn<int>(
          name: "Amount_Currency",
          table: "Order",
          nullable: true);

      migrationBuilder.AddColumn<decimal>(
          name: "Amount_Value",
          table: "Order",
          nullable: true);
  }

如您所见,由于某些原因,使用OwnOne会更改我的OrderId列,当我检查生成的sql时,它似乎会从中删除IDENTITY。

BEGIN
    IF NOT EXISTS(SELECT 1 FROM "__EFMigrationsHistory" WHERE "MigrationId" = '20200311224448_1.0.108-g5d3eec73db-Order') THEN
    ALTER TABLE `Order` ALTER COLUMN "OrderId" TYPE bigint;
    ALTER TABLE `Order` ALTER COLUMN "OrderId" SET NOT NULL;
    ALTER TABLE `Order` ALTER COLUMN "OrderId" DROP IDENTITY;
    ALTER TABLE `Order` ALTER COLUMN "OrderId" DROP DEFAULT;
    END IF;
END $$;

DO $$
BEGIN
    IF NOT EXISTS(SELECT 1 FROM "__EFMigrationsHistory" WHERE "MigrationId" = '20200311224448_1.0.108-g5d3eec73db-Order') THEN
    ALTER TABLE `Order` ADD "Amount_Currency" integer NULL;
    END IF;
END $$;

DO $$
BEGIN
    IF NOT EXISTS(SELECT 1 FROM "__EFMigrationsHistory" WHERE "MigrationId" = '20200311224448_1.0.108-g5d3eec73db-Order') THEN
    ALTER TABLE `Order` ADD "Amount_Value" numeric NULL;
    END IF;
END $$;

有人知道为什么在Entity Framework和postgresql数据库中添加自有类型会导致此行为,并且如何确保键字段不会被更改?

  • PostgreSQL 11.7
  • Microsoft.AspNetCore.App 3.1.2
  • Microsoft.NETCore.App 3.1.2
  • Microsoft.EntityFrameworkCore.Design版本= 3.1.1
  • Npgsql.EntityFrameworkCore.PostgreSQL版本= 3.1.2
c# postgresql .net-core entity-framework-core npgsql
1个回答
0
投票

这是Npgsql EF Core提供程序中的错误,请参阅https://github.com/npgsql/efcore.pg/issues/1324。修复程序将合并为3.1.4。

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