EntityFramework 无法确定复合主键顺序

Question

我正在尝试使用 EF 代码创建一个系统，在该系统中，您的团队有一个想法，但该团队也可以拥有属于其他团队的想法实体组合。我在添加迁移和使关系正常工作时遇到了麻烦。这是模型的代码：

public class Team
{
    public Team()
    {
        Portfolio = new HashSet<Portfolio>();
    }
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Balance { get; set; }
    public virtual ICollection<Portfolio> Portfolio { get; set; }
    public virtual Idea Idea { get; set; }
}

public class Idea
{
    [Key, ForeignKey("Team")]
    public int TeamId { get; set; }
    public virtual Team Team { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public decimal CurrentValue { get; set; }
}

public class Portfolio
{
    public int Id { get; set; }

    public int IdeaId { get; set; }
    public Idea Idea { get; set; }

    public int TeamId { get; set; }
    public Team Team { get; set; }
}

Team 和 Idea 是 1:1，这种关系很好。我认为问题在于我有与没有 Id 字段的想法相关的投资组合，因为它与 Team 是 1:1，它只有 teamid。

System.Data.Entity.Infrastructure.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.Entity.Core.UpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Ideas_dbo.Teams_TeamId". The conflict occurred in database "VHolsDaqDb", table "dbo.Teams", column 'Id'.

Answer 1

不确定如何重现您的迁移问题。 但是我确实在单元测试中重新创建了您的模型，并且在生成数据库时遇到了问题。
无法确定类型 “UnitTestProject1.Portfolio”的复合主键排序。使用 ColumnAttribute（参见http://go.microsoft.com/fwlink/?LinkId=386388）...

所以我添加了“列”属性，模型生成良好。
[列（顺序 = n）]
也许这可以帮助您解决迁移问题

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace UnitTestProject1
{
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            using (var context = new TestDbContext())
            {
                var teams = context.Teams.ToList();
                var ideas = context.Ideas.ToList();
                var portfolios = context.Portfolios.ToList();
            }
        }
    }


    public class TestDbContext : DbContext
    {
        public DbSet<Team> Teams { get; set; }
        public DbSet<Idea> Ideas { get; set; }
        public DbSet<Portfolio> Portfolios { get; set; }
    }

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

        public string Name { get; set; }

        [Key, ForeignKey("Idea")]
        [Column(Order = 2)]
        public int IdeaId { get; set; }

        public virtual Idea Idea { get; set; }

        [Key, ForeignKey("Team")]
        [Column(Order = 3)]
        public int TeamId { get; set; }

        public virtual Team Team { get; set; }
    }

    public class Idea
    {
        public int Id { get; set; }
        public string Name { get; set; }

        [Key, ForeignKey("Team")]
        public int TeamId { get; set; }

        public virtual Team Team { get; set; }
    }

    public class Team
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public virtual ICollection<Portfolio> Portfolios { get; set; }

        [Key, ForeignKey("Idea")]
        public int IdeaId { get; set; }

        public virtual Idea Idea { get; set; }
    }
}