Question

我试图找出这个问题; （EF6）

我有三张桌子，＆＃39;目标＆＃39; ，＆＃39; GoalType＆＃39;，＆＃39; GoalBudget＆＃39;。我在Goal和GoalType之间有一对一的工作正常，但是当我对GoalBudget执行相同操作时，这不起作用 - 当我更新 - 数据库＆＃39;我收到这个错误：

Goal_GoalBudget_Source ::多重性在角色＆＃39; Goal_GoalBudget_Source＆＃39;中无效。在关系＆＃39; Goal_GoalBudget＆＃39;。由于“从属角色”是指关键属性，因此“从属角色”的多重性的上限必须为“＆＃39; 1”。

问题是什么 - 非常感谢

public class Goal
{
    public int GoalId {get;set;}
    public string Name { get; set; }
    public string Description { get; set; }
    public decimal TargetAmount { get; set; }

    public int GoalBudgetId { get; set; }
    public int GoalTypeId { get; set; }
    // Navigaiton Properties
    public virtual GoalType GoalType { get; set; }
    public virtual GoalBudget GoalBudget{ get; set; }
}

public class GoalBudget
{
    public GoalBudget()
    {
        Goals = new List<Goal>();
    }
    public int GoalBudgetId { get; set; }
    public DateTime Created { get; set; }
    // Navigation Property
    public ICollection<Goal> Goals { get; set; }
}

public class GoalType
{
    public GoalType()
    {
        Goals = new List<Goal>();
    }
    public int GoalTypeId {get;set;}
    public string Name { get; set; }
    // Navigation Property
    public ICollection<Goal> Goals { get; set; }
}

配置是：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        // GOAL 
        modelBuilder.Entity<Goal>().Property(n => n.GoalId).IsRequired();
        modelBuilder.Entity<Goal>().Property(n => n.GoalId).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        modelBuilder.Entity<Goal>().Property(n => n.Name).IsRequired();
        modelBuilder.Entity<Goal>().Property(n => n.Name).HasMaxLength(50);
        modelBuilder.Entity<Goal>().Property(n => n.TargetAmount).IsRequired();

        //-
        modelBuilder.Entity<Goal>().HasKey(k => k.GoalId);
        modelBuilder.Entity<Goal>().HasRequired(o => o.GoalType).WithMany(o => o.Goals).HasForeignKey(k => k.GoalTypeId) ;
        modelBuilder.Entity<Goal>().HasRequired(o => o.GoalBudget).WithMany(o => o.Goals).HasForeignKey(k => k.GoalId);

        // GOAL TYPE
        modelBuilder.Entity<GoalType>().HasKey(k => k.GoalTypeId);
        // GOAL BUDGET
        modelBuilder.Entity<GoalBudget>().Property(n => n.GoalBudgetId).IsRequired();
        modelBuilder.Entity<GoalBudget>().Property(n => n.GoalBudgetId).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        modelBuilder.Entity<GoalBudget>().Property(n => n.Created).IsRequired();
        modelBuilder.Entity<GoalBudget>().HasKey(k => k.GoalBudgetId);

Answer 1

您的FluentAPI映射中有错误：

modelBuilder.Entity<Goal>()
    .HasRequired(o => o.GoalBudget)
    .WithMany(o => o.Goals)
    .HasForeignKey(k => k.GoalId);

您的HasForeignKey方法正在配置错误的外键列（GoalId），而应该是GoalBudgetId。

尝试：

modelBuilder.Entity<Goal>()
    .HasRequired(o => o.GoalBudget)
    .WithMany(o => o.Goals)
    .HasForeignKey(k => k.GoalBudgetId);

Fluent API问题 - Multiplicity在Role中无效

1 个答案: