【EF Core】EF core中使用FluentAPI對外鍵進行指定配置

有兩個實體，關系如下：

public class CatalogNodeEntity : FullAuditedEntity<Guid>, IMultiTenant
    {
public virtual string Name { get; protected set; }
        
        public virtual string DisplayName { get; protected set; }

        private List<CatalogLayerEntity> Layers = new List<CatalogLayerEntity>();
    }

public class CatalogLayerEntity:FullAuditedEntity<Guid>, IMultiTenant
    {

        public virtual string Name { get; protected set; }

        public virtual Guid? CatalogNodeId { get; set; }
        
        public virtual CatalogNodeEntity CatalogNode { get; set; }

     }

配置one to many 的實體關系，可這樣配置

builder.Entity<CatalogNodeEntity>(m =>
            {
                m.ToTable(options.TablePrefix + "CatalogNode", options.Schema);
                m.ConfigureByConvention();
                m.Property(o => o.Name).IsRequired().HasMaxLength(CatalogConsts.MaxNameLength);
                m.HasMany(u => u.Layers).WithOne(u=>u.CatalogNode).HasForeignKey(u=>u.CatalogNodeId).OnDelete(DeleteBehavior.Cascade);
            });

這里有個坑需要注意，如果在WithOne的函數中沒有指定實體，又在HasForeignKey中指定了外鍵，這是進行Migration就會出現兩個外鍵

m.HasMany(u => u.Layers).WithOne().HasForeignKey(u=>u.CatalogNodeId).OnDelete(DeleteBehavior.Cascade);