I am building a reservation system. I have users in roles('admin', 'client', 'employee', 'student').
Each reservation must be associated with a user of role client, it might be assigned to user of role employee and might also be assigned to user of role student.
So in my reservation class I have properties of type User and I have marked them with [ForeignKey("AnytypeId")] attribute to hint EF for relations.
I have seen code like this at http://blog.stevensanderson.com/2011/01/28/mvcscaffolding-one-to-many-relationships/
public class Reservation
{
public int ReservationID
{
get;
set;
}
[Required(ErrorMessage="Please provide a valid date")]
public DateTime ReservationDate
{
get;
set;
}
public DateTime ReservationEnd { get; set; }
public DateTime EntryDate
{
get;
set;
}
public DateTime UpdatedOn
{
get;
set;
}
public decimal Ammount
{
get;
set;
}
public decimal? Discount { get; set; }
[DataType(DataType.MultilineText)]
public string ServiceDetails { get; set; }
[DataType(DataType.MultilineText)]
public string Remarks { get; set; }
public string VoucherNumber { get; set; }
public int ServiceID
{
get;
set;
}
public Service Service
{
get;
set;
}
public string EmployeeId { get; set; }
[ForeignKey("EmployeeId")]
public User Employee { get; set; }
public string ClientId { get; set; }
[ForeignKey("ClientId")]
public User Client { get; set; }
public string StudentId { get; set; }
[ForeignKey("StudentId")]
public User Student { get; set; }
}
public class User
{
//[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
//public Guid UserId { get; set; }
[Key]
[Required(ErrorMessage = "User Name is required")]
[Display(Name = "User Name")]
[MaxLength(100)]
public string UserName { get; set; }
[Required]
[MaxLength(64)]
public byte[] PasswordHash { get; set; }
[Required]
[MaxLength(128)]
public byte[] PasswordSalt { get; set; }
[Required(ErrorMessage = "Email is required")]
[DataType(DataType.EmailAddress)]
[MaxLength(200)]
public string Email { get; set; }
[MaxLength(200)]
public string Comment { get; set; }
[Display(Name = "Approved?")]
public bool IsApproved { get; set; }
[Display(Name = "Crate Date")]
public DateTime DateCreated { get; set; }
[Display(Name = "Last Login Date")]
public DateTime? DateLastLogin { get; set; }
[Display(Name = "Last Activity Date")]
public DateTime? DateLastActivity { get; set; }
[Display(Name = "Last Password Change Date")]
public DateTime DateLastPasswordChange { get; set; }
public string address { get; set; }
public string LastName { get; set; }
public string FirstName { get; set; }
public string Phone { get; set; }
public bool? IsActive { get; set; }
public int? ClientTypeID { get; set; }
public virtual ClientType ClientType { get; set; }
public virtual ICollection<Role> Roles { get; set; }
public DateTime? PackageValidity { get; set; }
public virtual ICollection<Reservation> Reservations { get; set; }
}
public class UserMap : EntityTypeConfiguration<User>
{
public UserMap()
{
this.HasMany(u => u.Roles)
.WithMany(r => r.Users)
.Map(m =>
{
m.ToTable("RoleMemberships");
m.MapLeftKey("Username");
m.MapRightKey("RoleName");
});
}
}
Now as I run my mvc3 EF code first app database created for me on the fly with following ERD and edmx model.
Now few problems that I am having: 1. When I am listing all the users of role clients their reservation property is showing always 0 even if their are reservations available in database. 2. If I am trying to delete a user of role client who have reservation in database I get following error.
The DELETE statement conflicted with the REFERENCE constraint "Reservation_Client". The conflict occurred in database "CRSDB", table "dbo.Reservations", column 'ClientId'. The statement has been terminated.
I checked the realtions in ERD and edmx model their is no cascade delete applied to them. How can I instruct EF to delete all the reservations when deleting user of role client but not for users of role employee or student.
This code does the trick
public class Reservation
{
public int ReservationID
{
get;
set;
}
[Required(ErrorMessage="Please provide a valid date")]
public DateTime ReservationDate
{
get;
set;
}
public DateTime ReservationEnd { get; set; }
public DateTime EntryDate
{
get;
set;
}
public DateTime UpdatedOn
{
get;
set;
}
public decimal Ammount
{
get;
set;
}
public decimal? Discount { get; set; }
[DataType(DataType.MultilineText)]
public string ServiceDetails { get; set; }
[DataType(DataType.MultilineText)]
public string Remarks { get; set; }
public String PaymentMethod { get; set; }
public string VoucherNumber { get; set; }
public int ServiceID
{
get;
set;
}
public virtual Service Service
{
get;
set;
}
public string EmployeeID { get; set; }
[ForeignKey("EmployeeID")]
public virtual User Employee { get; set; }
public string ClientID { get; set; }
[ForeignKey("ClientID")]
public virtual User Client { get; set; }
public string StudentID { get; set; }
[ForeignKey("StudentID")]
public virtual User Student { get; set; }
}
public class ReservationMap : EntityTypeConfiguration<Reservation>
{
public ReservationMap()
{
this.HasOptional(r => r.Client).WithMany().WillCascadeOnDelete(true);
this.HasOptional(r => r.Employee).WithMany().WillCascadeOnDelete(false);
this.HasOptional(r=>r.Student).WithMany().WillCascadeOnDelete(false);
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.