实体框架核心错误地查询关系 [英] Entity Framework Core incorrectly querying relationships

问题描述

我有一个使用Identity 2.0的现有ASP.NET MVC应用程序。我正在尝试使用带有Ef Core 2.1的新Core 2.1应用查询用户对象。

I have an existing ASP.NET MVC app that uses Identity 2.0. I'm trying to query the user objects using a new Core 2.1 app with Ef Core 2.1.

我直接查询而不是使用UserManager / RoleManager，因为.NET MVC和.NET核心应用程序的版本不同，所以我不想陷入困境麻烦。

I'm querying directly rather than using UserManager / RoleManager as the .NET MVC and .NET core apps have different versions and I don't want to get myself into any trouble down the track.

我的问题是我无法让所有用户都扮演特定角色。

My problem is that I cannot get all the users in a particular role.

我正在尝试在我的.net核心应用程序中这样做：

I am trying to do itvlike this in my .net core application:

public partial class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
    : base(options)
    { }

    public virtual DbSet<ApplicationUser> AspNetUsers { get; set; }
    public virtual DbSet<AspNetRole> AspNetRoles { get; set; }
    public virtual DbSet<AspNetUserRole> AspNetUserRoles { get; set; }

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

        modelBuilder.Entity<AspNetUserRole>()
                        .HasKey(pc => new { pc.UserId, pc.RoleId });

    }
}

我的角色映射模型：

public class AspNetRole
{
    [Key]
    public Guid Id { get; set; }

    [MaxLength(256)]
    [Required]
    public string Name {get; set;}

    public virtual ICollection<AspNetUserRole> AspNetUserRoles {get; set;}

}

我的模型来映射用户：

 public class ApplicationUser : IdentityUser
{

    public virtual ICollection<AspNetUserRole> AspNetUserRoles {get; set;}

}

和我的联接表：

public class AspNetUserRole
{

    [MaxLength(256)]
    [Required]
    public Guid UserId { get; set; }

    public ApplicationUser User {get; set;}

    [MaxLength(256)]
    [Required]
    public Guid RoleId { get; set; }

    public AspNetRole Role {get; set;} 

}

我在存储库中运行的查询是这样的：

The query that I am running in my repository is this:

    var usersInRole = _context.AspNetRoles
        .Where(p => p.Name == "Manager")
        .SelectMany(p => p.AspNetUserRoles)
        .Select(pc => pc.User);

但是查询失败。 EF正在翻译，如下所示（我从SELECT语句中删除了一堆字段）：

However the query is failing. EF is translating is as follows (I've taken out a bunch of fields from the SELECT statement):

SELECT [p.AspNetUserRoles.User]。[Id]， [p.AspNetUserRoles.User]。[用户名]
来自[AspNetRoles] AS [p]
内连接[AspNetUserRoles] AS [p.AspNetUserRoles] ON [p]。[Id] = [p。 AspNetUserRoles]。[角色ID]
左联接[AspNetUsers] AS [p.AspNetUserRoles.User]开启[p.AspNetUserRoles]。[UserId1] = [p.AspNetUserRoles.User]。[Id]
[p]。[名称] = @__ role_0

SELECT [p.AspNetUserRoles.User].[Id], [p.AspNetUserRoles.User].[UserName] FROM [AspNetRoles] AS [p] INNER JOIN [AspNetUserRoles] AS [p.AspNetUserRoles] ON [p].[Id] = [p.AspNetUserRoles].[RoleId] LEFT JOIN [AspNetUsers] AS [p.AspNetUserRoles.User] ON [p.AspNetUserRoles].[UserId1] = [p.AspNetUserRoles.User].[Id] WHERE [p].[Name] = @__role_0

如您所见，它错误地查询了[p.AspNetUserRoles]。[UserId1]因此出现以下错误：

As you can see it's incorrectly querying [p.AspNetUserRoles].[UserId1] and therefore gives the following error:

System.Data.SqlClient.SqlException（0x80131904）：无效的列名'UserId1'。

System.Data.SqlClient.SqlException (0x80131904): Invalid column name 'UserId1'.

推荐答案

除了ApplicationDbContext类的 OnModelCreating 方法中的代码外，您还需要添加以下代码

You need to add following code in addition to your code in OnModelCreating method of ApplicationDbContext class

modelBuilder.Entity<AspNetUserRole>()
    .HasOne(aur => aur.User)
    .WithMany(aur => aur.AspNetUserRoles)
    .HasForeignKey(aur => aur.UserId);

modelBuilder.Entity<AspNetUserRole>()
    .HasOne(aur => aur.Role)
    .WithMany(aur => aur.AspNetUserRoles)
    .HasForeignKey(aur => aur.RoleId);

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