using System;
using System.Collections.Generic;
using System.Data.Entity.ModelConfiguration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace firstCodeFirstApp
{
 public class DonatorMap : EntityTypeConfiguration<Donator>
 {
 public DonatorMap()
 {
 ToTable("Donators");
 Property(m => m.Name)
 .IsRequired();
 HasMany(d => d.PayWays)
 .WithRequired()
 .HasForeignKey(p => p.DonatorId);
 }
 }

 public class DonatorTypeMap : EntityTypeConfiguration<DonatorType>
 {
 public DonatorTypeMap()
 {
 HasMany(d => d.Donators)
 .WithOptional(d => d.DonatorType) //外键约束可以为空
 .HasForeignKey(d => d.DonatorTypeId)
 .WillCascadeOnDelete(false);
 }
 }

 public class StudentMap : EntityTypeConfiguration<Student>
 {
 public StudentMap()
 {
 HasRequired(s => s.Person)
 .WithOptional(p => p.Student); // Optional 可选的

 HasKey(s => s.PersonId); //使用 HasKey 方法 指定一个表的主键

 Property(s => s.CollegeName)
 .HasMaxLength(50)
 .IsRequired();
 }
 }

 public class PersonMap : EntityTypeConfiguration<Person>
 {
 public PersonMap()
 {
 /*
 * * MapLeftKey 配置左外键的列名。左外键指向在 HasMany 调用中指定的导航属性的父实体。
 * MapRightKey 配置右外键的列名。右外键指向在 WithMany 调用中指定的导航属性的父实体。
 */


 HasMany(p => p.Companies)
 .WithMany(c => c.Persons)
 .Map(m => {
 m.MapLeftKey("PersonId");
 m.MapRightKey("CompanyId");
 });
 }
 }
}