Question

用户可以访问许多关联。对于给定用户，我需要为他有权访问的每个关联分配一个工作角色。如何先在EF代码中映射表格？

for(var i = 0; i < getFields.length; i++) {
    console.log(getFields[i]);
}

更新：我认为octavioccl是正确的，但我如何为用户分配Assoc？这是我的代码。它不愿意工作：

[User] 
UserId

[Association]
AssocId

[Role]
RoleId

[LNK_User_Assoc_Role]
UserId   [PK]
AssocId  [PK]
RoleId   [FK]

Answer 1

有两种方法可以满足您的需求。

使用Data Annotations：

public class User{

  [Key]
  public Guid UserId {get;set;}

  public virtual ICollection<UserRoleAssociation> UserRoleAssociations {get;set;}      
}

public class Role{
  [Key]
  public Guid RoleId {get;set;}

  public virtual ICollection<UserRoleAssociation> UserRoleAssociations {get;set;}
}

public class Association{
  [Key]
  public Guid AssociationId {get;set;}

  public virtual ICollection<UserRoleAssociation> UserRoleAssociations {get;set;}
}

public class UserRoleAssociation{

 [Key,ForeignKey("User"),Column(Order=1)]
 public Guid UserId {get;set;}

 [Key,ForeignKey("Role"),Column(Order=2)]
 public Guid RoleId {get;set;}

 [Key,ForeignKey("Associoation"),Column(Order=3)]
 public Guid AssociationId {get;set;}

 //Navigation Properties

 public virtual User User {get;set;}
 public virtual Role Role {get;set;}
 public virtual Association Association {get;set;}

}

使用Fluent Api。在这种情况下，您不需要在我上面显示的模型中使用任何属性（删除它们），只需覆盖上下文中的OnModelCreating方法并添加这些配置：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
 base.OnModelCreating(modelBuilder);

 modelBuilder.Entity<UserRoleAssociation>()
    .HasKey(c => new {c.UserId, c.RoleId, c.AssociationId});

 modelBuilder.Entity<UserRoleAssociation>()
    .HasRequired(p => p.User)
    .WithMany(u => u.UserRoleAssociations)
    .HasForeignKey(p => p.UserId);

 modelBuilder.Entity<UserRoleAssociation>()
    .HasRequired(p => p.Role)
    .WithMany(r => r.UserRoleAssociations)
    .HasForeignKey(p => p.RoleId);

 modelBuilder.Entity<UserRoleAssociation>()
    .HasRequired(p => p.Association)
    .WithMany(a => a.UserRoleAssociations)
    .HasForeignKey(p => p.AssociationId);
}

Answer 2

EF将根据对象的关系生成FK。

public class User{
    public Guid UserId {get;set;}
    public Role Role {get;set;}
    public Association Association {get;set;}
}

public class Role{
    public Guid RoleId {get;set;}
}

public class Association{
    public Guid AssociationId {get;set;}
}

EF链接表有3个外键

2 个答案: