Seed方法不播种

Question

我的seed方法没有显示任何错误，但是在我从PMC运行update-database之后，它肯定不会播种任何东西。我的问题非常具体，因为数据库的整体结构和身份的使用。到目前为止，Seed方法是这样的：

protected override void Seed(ApplicationDbContext context)
    {
        if (!context.Users.Any())
        {
            var userStore = new UserStore<ApplicationUser>(context);
            var userManager = new UserManager<ApplicationUser>(userStore);
            var user = new ApplicationUser()
            {

                FirstName = "Prvi",
                LastName = "Doktor",
                DateOfBirth = new DateTime(1977, 4, 3),
                EmploymentStatus = EmploymentStatus.Employed,
                PhoneNumber = "062/062-062",
                Email = "prvi@gmail.ocami",
                Address = "Kulovica 9",
                DateCreated = DateTime.Now,
                EmailConfirmed = true,

            };
            userManager.Create(user, "P@ssw0rd");
            context.SaveChanges();
        }
}

我的ApplicationDbContext类：

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{

    public DbSet<Dentist> Dentists { get; set; }
    public DbSet<Patient> Patients { get; set; }
}

我的模型从ApplicationUser扩展而来，而后者又从IdentityUser扩展而来

ApplicationUser：

public class ApplicationUser : IdentityUser, IModificationHistory
{
    [Required]
    [Display(Name = "First Name")]
    [StringLength(50)]
    public string FirstName { get; set; }

    [Required]
    [Display(Name = "Last Name")]
    [StringLength(50)]
    public string LastName { get; set; }

    [Required]
    [DataType(DataType.Password)] //DataType is very powerfull Data Annotation, which can affect our view if we use EF, so I will try to accomplish as much as possible with that
    [Display(Name = "Password")]
    public string Password { get; set; }


    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
    [Display(Name = "Date of birth")]
    public DateTime DateOfBirth { get; set; }

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

    public EmploymentStatus? EmploymentStatus { get; set; } //This value is nullable

    public DateTime DateCreated { get; set; }
    public DateTime? DateModified { get; set; }


    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here

        return userIdentity;
    }


}

牙医：

[Table("Dentist")]
public class Dentist : ApplicationUser
{

    public string Place { get; set; }


    //Relations
    public virtual ICollection<Patient> Patients { get; set; }
    public virtual Schedule Schedule { get; set; }
}

患者：

[Table("Patient")]
public class Patient : ApplicationUser
{
    //Relations
    public virtual Dentist Dentist { get; set; }

    public virtual MedicalHistory MedicalHistory { get; set; }
    public virtual ICollection<Appointment> Appointments { get; set; }
}

我想知道，为什么它没有给出任何结果，我应该如何看待我建立的这种关系，或者还有其他更符合逻辑的关系可以建立。

Answer 1

我通常使用这种方法：

1. 使用我想要的密码在我的系统中创建一个用户(或使用下面的passwordhaser类，链接如下)
2. 使用这些值在db
3. 更新Seed方法中查找用户。

这样，我就不会在Seed方法中使用任何依赖项，因为该方法将在每次迁移时运行，可能需要一段时间才能完成。

Seed方法应该使用AddOrUpdate方法：

protected override void Seed(BookService.Models.BookServiceContext context)
{
    context.Users.AddOrUpdate(x => x.Id,
    new ApplicationUser () { Id = 1, FirstName = "FirstName", LastName="LastName", PasswordHash="<hash from dbase>" }
    );       
}

要生成密码的散列，还可以使用PasswordHasher.HashPassword方法。

这样，EF就知道何时添加或更新您在Seed方法中提供的值。

当表中没有记录时，if (!context.Users.Any())将仅在新db上工作。