我正在尝试在 EF 4.3 中创建这三个模型：
- Family
- Guid FamilyId
- ICollection< Person> Members
- Company
- Guid CompanyId
- ICollection< Person> Employees
- Person
- Guid PersonId
- String Name
A person can belong to multiple families and multiple companies, as well as doesn't belong to any.
运行代码后，数据库中的映射似乎有点奇怪。未映射家庭成员和公司员工。此外，Persons 表中有四列：PersonId、Name、Family_FamilyId 和 Company_CompanyId。
我认为我的代码意味着一个人将永远属于 1 个家庭和 1 个公司。我应该如何更改代码？
你不能像你想象的那样在你的课程中表达所有这些信息。要添加额外信息，您有几个选项。
您可以将其添加到您的 EF 上下文类
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
//All people must belong to a family.
modelBuilder.Entity<Family>().HasMany(x => x.Members)
.WithRequired();
//Each person may belong to ZERO-Many companies.
modelBuilder.Entity<Company>().HasMany(x => x.Employees)
.WithMany();
}
或者这个到你的 EF 上下文类
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new ComapnyMapper());
modelBuilder.Configurations.Add(new FamilyMapper());
}
public class FamilyMapper : EntityTypeConfiguration<Family>
{
public FamilyMapper()
{
HasMany(x => x.Members)
.WithRequired();
}
}
public class CompanyMapper : EntityTypeConfiguration<Company>
{
public CompanyMapper()
{
HasMany(x => x.Employees)
.WithMany();
}
}
我最终将模型类更改为