我正在尝试映射以下内容：
用户与管理员1到0..1的关系。一个用户可以是一种管理员状态或没有管理员状态
用户可以打开多张票证，但票证只能分配给一个用户。用户1票证到多人
管理员（具有管理员身份的用户）已分配给他修复的故障单。票证应该有一个adminID来标识分配给它的管理员。
有人可以验证我的映射是否正确
我的故障单表格如何CLICK HERE
modelBuilder.Entity<Ticket>()
.HasMany(c => c.Administrators).WithMany(i => i.Tickets)
.Map(t => t.MapLeftKey("TicketID")
.MapRightKey("AdministratorID")
.ToTable("AdministratorsTickets"));
modelBuilder.Entity<Administrator>()
.HasKey(e => e.UserID);
modelBuilder.Entity<User>()
.HasOptional(s => s.Administrator) // Mark StudentAddress is optional for Student
.WithRequired(ad => ad.User); // Create inverse relationship
Configuration.cs
public Configuration()
{
AutomaticMigrationsEnabled = false;
}
protected override void Seed(RecreationalServicesTicketingSystem.DAL.IssueContext context)
{
var departments = new List<Department>
{
new Department { DepartmentID = 1, Name = "IT"},
new Department { DepartmentID = 2, Name = "Admin" },
new Department { DepartmentID = 3, Name = "Human Resources"},
new Department { DepartmentID = 4, Name = "Mechanics" },
new Department { DepartmentID = 5, Name = "Directors" },
new Department { DepartmentID = 6, Name = "Operations"}
};
departments.ForEach(s => context.Departments.AddOrUpdate(p => p.Name, s));
context.SaveChanges();
var depots = new List<Depot>
{
new Depot { DepotID = 1, Name = "Porana"},
new Depot { DepotID = 2, Name = "Far North"},
};
depots.ForEach(s => context.Depots.AddOrUpdate(p => p.Name, s));
context.SaveChanges();
var users = new List<User>
{
new User { FirstMidName = "Jason", LastName = "Wan",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1, DepotID = 1},
new User { FirstMidName = "Andy", LastName = "Domagas",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1,DepotID = 1},
new User { FirstMidName = "Denis", LastName = "Djohar",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1 ,DepotID = 1},
new User { FirstMidName = "Christine", LastName = "West",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1, DepotID = 1},
};
users.ForEach(s => context.Users.AddOrUpdate(p => p.FirstMidName, s));
context.SaveChanges();
users.ForEach(s => context.Users.AddOrUpdate(p => p.LastName, s));
context.SaveChanges();
var administrator = new List<Administrator>
{
new Administrator {AdminID = 1, AdminRole = "Administrator LVL1", User = users.Single ( s => s.UserID == 1),
Tickets = new List<Ticket>() },
new Administrator {AdminID = 2, AdminRole = "Administrator LVL2", User = users.Single ( s => s.UserID == 2),
Tickets = new List<Ticket>() },
new Administrator {AdminID = 3, AdminRole = "Administrator LVL3", User = users.Single ( s => s.UserID == 3),
Tickets = new List<Ticket>() }
};
administrator.ForEach(s => context.Administrators.AddOrUpdate(p => p.AdminID, s));
context.SaveChanges();
var categories = new List<Category>
{
new Category {CategoryID = 0001, Title = "Desktop"},
new Category {CategoryID = 0002, Title = "Mobile"},
new Category {CategoryID = 0003, Title = "Menzits"},
new Category {CategoryID = 0004, Title = "XMPRO"},
new Category {CategoryID = 0005, Title = "Con-X"},
new Category {CategoryID = 0006, Title = "Promapp"},
new Category {CategoryID = 0007, Title = "QGIS"},
};
categories.ForEach(s => context.Categories.AddOrUpdate(p => p.Title, s));
context.SaveChanges();
var tickets = new List<Ticket>
{
new Ticket {
UserID = users.Single(s => s.LastName == "Wan").UserID,
CategoryID = categories.Single(c => c.Title == "Con-X" ).CategoryID,
Issue = ("Test Error NEW TEST"),
AdminID = 1,
Priority = Priority.High
},
new Ticket {
UserID = users.Single(s => s.LastName == "Wan").UserID,
CategoryID = categories.Single(c => c.Title == "Desktop" ).CategoryID,
Issue = ("Test Error 2"),
AdminID = 2,
Priority = Priority.Med
},
};
foreach (Ticket e in tickets)
{
var ticketInDataBase = context.Tickets.Where(
s =>
s.User.UserID == e.UserID &&
s.Category.CategoryID == e.CategoryID).SingleOrDefault();
if (ticketInDataBase == null)
{
context.Tickets.Add(e);
}
}
context.SaveChanges();
}
Ticket.cs
public enum Priority
{
Low, Med, High
}
public class Ticket
{
public string Issue { get; set; }
[DisplayFormat(NullDisplayText = "No Priority")]
public Priority? Priority { get; set; }
public int CategoryID { get; set; }
[ForeignKey("CategoryID")]
public virtual Category Category { get; set; }
public int TicketID { get; set; }
public int AdminID { get; set; }
public virtual ICollection<Administrator> Administrators { get; set; }
public int UserID { get; set; }
//[ForeignKey("TicketID")]
public virtual User User { get; set; }
}
User.cs
public class User
{
public int UserID { get; set; }
[StringLength(50, MinimumLength = 1)]
public string LastName { get; set; }
[StringLength(50, MinimumLength = 1, ErrorMessage = "First name cannot be longer than 50 characters.")]
[Column("FirstName")]
public string FirstMidName { get; set; }
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime EnrollmentDate { get; set; }
public string FullName
{
get { return LastName + ", " + FirstMidName; }
}
public int AdministratorID { get; set; }
[ForeignKey("AdministratorID")]
public virtual Administrator Administrator { get; set; }
public int DepartmentID { get; set; }
[ForeignKey("DepartmentID")]
public virtual Department Department { get; set; }
public int DepotID { get; set; }
[ForeignKey("DepotID")]
public virtual Depot Depot { get; set; }
public int TicketID { get; set; }
public virtual ICollection<Ticket> Tickets { get; set; }
}
Administrator.cs
public class Administrator
{
[Key, ForeignKey("User")]
public int UserID { get; set; }
public int AdminID { get; set; }
public int TicketID { get; set; }
[StringLength(50)]
public string AdminRole { get; set; }
public virtual ICollection<Ticket> Tickets { get; set; }
public virtual User User { get; set; }
}
IssueContext.cs
public class IssueContext : DbContext
{
public DbSet<User> Users { get; set; }
public DbSet<Ticket> Tickets { get; set; }
public DbSet<Category> Categories { get; set; }
public DbSet<Department> Departments { get; set; }
public DbSet<Administrator> Administrators { get; set; }
public DbSet<Depot> Depots { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
modelBuilder.Entity<Ticket>()
.HasMany(c => c.Administrators).WithMany(i => i.Tickets)
.Map(t => t.MapLeftKey("TicketID")
.MapRightKey("AdministratorID")
.ToTable("AdministratorsTickets"));
modelBuilder.Entity<Administrator>()
.HasKey(e => e.UserID);
modelBuilder.Entity<User>()
.HasOptional(s => s.Administrator) // Mark StudentAddress is optional for Student
.WithRequired(ad => ad.User); // Create inverse relationship
}
}
答案 0 :(得分：0)
映射不是100％正确，这些部分对我来说是错误的：
modelBuilder.Entity<Administrator>()
.HasKey(e => e.UserID);
[Key, ForeignKey("User")]
public int UserID { get; set; }
从这些行看起来您正在使用Administrator.UserID同时使用主键和外键。
相反，您应该将您的Administrator.AdministratorId设为主键：
modelBuilder.Entity<Administrator>()
.HasKey(e => e.AdministratorID);
public class Administrator
{
[Key]
public int AdminID { get; set; }
[ForeignKey("User")]
public int UserID { get; set; }
public int TicketID { get; set; }
[StringLength(50)]
public string AdminRole { get; set; }
public virtual ICollection<Ticket> Tickets { get; set; }
public virtual User User { get; set; }
}
此外，我还不能100％确定您在管理员和故障单之间有正确的映射：您从管理员/用户到故障单之间有1对多的关系，但您仍然在管理员和用户中拥有外键TicketID类，这也是不正确的。