Question

给出以下数据库模型

我有两个流畅的实体框架配置，一个在我读取时工作（设置了setupFields列表），另一个用于写入，如果我也用于读取，则总是带有一个空的SetupFields列表

[Table("[BALANCE.SETUP]")]
public class SetupEntity
{
    [Key]
    public Guid Id { get; set; }

    public string Title { get; set; }

    public virtual ChassisEntity Chassis { get; set; }

    public virtual EventEntity Event { get; set; }

    public virtual ICollection<SetupFieldEntity> SetupFields { get; set; }
}

[Table("[BALANCE.SETUP.FIELD]")]
public class SetupFieldEntity
{
    [Key]
    [Column(Order = 0)]
    public Guid SetupId { get; set; }

    [Key]
    [Column(Order = 1)]
    public int Sequence { get; set; }

    public string Section { get; set; }

    public string Name { get; set; }

    public string Value { get; set; }

    public virtual SetupEntity Setup { get; set; }
}

（可以阅读）

        modelBuilder.Entity<SetupEntity>()
            .HasMany(x => x.SetupFields)
            .WithRequired(x => x.Setup)
            .Map(x => x.MapKey("SETUPID"));

（可以写）

        modelBuilder.Entity<SetupEntity>()
            .HasMany(x => x.SetupFields)
            .WithRequired()
            .HasForeignKey(x => x.SetupId);

如果我使用读取配置来读取，这是我得到的错误：

在SET子句中多次指定列名“SETUPID”。在同一SET子句中不能为列分配多个值。修改SET子句以确保列只更新一次。如果SET子句更新视图的列，则列名“SETUPID”可能在视图定义中出现两次。

更新1

为了清楚说明，模型是延迟加载的，我明确地将它们包含在内，因此，在使用第一个配置时，模型按预期设置：

if (includeFields)
{
    x = x.Include(entity => entity.SetupFields);
}

更新2

根据下面的评论，我将映射更改为只在插入时有效，但在读取子集合时仍为空：

modelBuilder.Entity<SetupEntity>().HasMany(x => x.SetupFields);


[Table("[BALANCE.SETUP]")]
public class SetupEntity
{
    [Key]
    public Guid Id { get; set; }

    public string Title { get; set; }

    public virtual ChassisEntity Chassis { get; set; }

    public virtual EventEntity Event { get; set; }

    public virtual ICollection<SetupFieldEntity> SetupFields { get; set; }
}

[Table("[BALANCE.SETUP.FIELD]")]
public class SetupFieldEntity
{
    [Key]
    [Column(Order = 0)]
    public Guid SetupId { get; set; }

    [Key]
    [Column(Order = 1)]
    public int Sequence { get; set; }

    public string Section { get; set; }

    public string Name { get; set; }

    public string Value { get; set; }

    public virtual SetupEntity Setup { get; set; }
}

更新3

根据评论我完全从实体中删除了属性，但collection属性仍为null：（

public class SetupEntity
{
    public Guid Id { get; set; }

    public string Title { get; set; }

    public virtual ChassisEntity Chassis { get; set; }

    public virtual EventEntity Event { get; set; }

    public virtual ICollection<SetupFieldEntity> SetupFields { get; set; }
}

[Table("[BALANCE.SETUP.FIELD]")]
public class SetupFieldEntity
{
    public Guid SetupId { get; set; }

    public int Sequence { get; set; }

    public string Section { get; set; }

    public string Name { get; set; }

    public string Value { get; set; }

    public virtual SetupEntity Setup { get; set; }
}

modelBuilder.Entity<SetupEntity>()
    .HasKey(x => x.Id)
    .HasMany(x => x.SetupFields)
    .WithRequired(x => x.Setup);

modelBuilder.Entity<SetupFieldEntity>()
    .HasKey(x => x.SetupId)
    .HasKey(x => x.Sequence);

欢迎任何帮助。感谢

实体框架，用于读取和写入的配置

0 个答案: