EF代碼優先遷移模型構建器

Question

我的C＃代碼中有兩個實體：

  public class Currency
{        
    public int CurrencyID { get; set; }

    public string CurrencyName { get; set; }

    public virtual ICollection<CurrencyRate> CurrentCurrencyRates { get; set; }
    public virtual ICollection<CurrencyRate> TargetCurrencyRates { get; set; }
}

 public class CurrencyRate
    {
        public int RateID { get; set; }
        public DateTime RateDate { get; set; }
        public Decimal RateValue { get; set; }
        public int CurrentCurrencyID { get; set; }
        public int TargetCurrencyID { get; set; }


        public virtual Currency CurrentCurrency { get; set; }
        public virtual Currency TargetCurrency { get; set; }
    }

我有上下文類：

public EconomicAppContext()
            : base("EconomicApp")
        { }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<CurrencyRate>().Property(v => v.RateValue).HasColumnType("Money");
            modelBuilder.Entity<CurrencyRate>().HasKey(cr => cr.RateID);
            modelBuilder.Entity<Currency>().HasKey(c => c.CurrencyID);

            modelBuilder.Entity<Currency>().
                HasMany<CurrencyRate>(c => c.CurrentCurrencyRates).
                WithRequired(c => c.CurrentCurrency).
                HasForeignKey(c => c.RateID);
            modelBuilder.Entity<Currency>().
               HasMany<CurrencyRate>(c => c.TargetCurrencyRates).
               WithRequired(c => c.TargetCurrency).
               HasForeignKey(c => c.RateID);

             base.OnModelCreating(modelBuilder);
        }

        public DbSet<CurrencyRate> CurrencyRates { get; set; }
        public DbSet<Currency> Currencies { get; set; }

我正在嘗試遷移到現有數據庫中。 我想獲取如下所示的架構：

我做錯了什么？ 有人可以幫我將表遷移到數據庫嗎？

Answer 1

嘗試如下操作：

modelBuilder.Entity<CurrencyRate>().
                HasRequired<Currency>(c => c.CurrentCurrency).
                WithMany(c => c.CurrentCurrencyRates).
                HasForeignKey(c => c.CurrentCurrencyID);
modelBuilder.Entity<CurrencyRate>().
               HasRequired<Currency>(c => c.TargetCurrency).
               WithMany(c => c.TargetCurrencyRates).
               HasForeignKey(c => c.TargetCurrencyID);