ASP.NET MVC身份关系

Question

I am new to ASP.NET MVC 4 and i'm developing an application. In my application i have a districts table with properties id, name. i want to associate this district table to applicationUser in the identityModel.cs file. My main goal is to establish a one to many relationship between my users and districts. As in, a more than one user maps to a single district. i tried this in my applicationUser class

public class ApplicationUser : IdentityUser
{
    public int ApplicationUserID { get; set; }

    [ForeignKey("District")]
    public int DistrictID { get; set; }
    public virtual District District { get; set; }
}

this is my districts table too

public class District
{
    public int DistrictID { get; set; }

    [Required]
    [Display(Name="District Name")]
    public string Name { get; set; }

    public string Status { get; set; }

    //Retrieving the region value through the id
    [Display(Name = "Region")]
    public int RegionID { get; set; }
    public virtual Region Region { get; set; }

    public virtual List<AreaCouncil> AreaCouncils { get; set; }

    public virtual List<ApplicationUser> ApplicationUsers { get; set; }
}

When i try to scaffold, i receive the following error message:

'Unable to retrieve metadata for 'Basis.Models.Region'. One or more validation >errors were detected during model generation. Basis.Models.IdentityUserLogin::Entity Type 'IdentityUserLogin' has no key >defined. Define the key for this Entity Type. Basis.Models.IdentityUserRole::Entity Type 'IdentityUserRole' has no key >defined. Define the key for this Entity Type.'........

Can anyone please help me out in accomplishing this relationship?

Answer 1

In ApplicationUser you just want a property of District. You don't want to have it virtual unless you actually want runtime polymorphism.

I would name the property something else than District. Eg

public District HomeDistrict {get;set}

Answer 2

IdentityUser already has a PK. remove

public int ApplicationUserID { get; set; }

from your ApplicationUser Class