Deletion issue using fluent nhibernate in mvc 3 - asp.net-mvc-3

Question

I've a layer name MVCTemplate.Common, having two folders Entities and Mappings. In Entities User.cs and Role.cs is as under respectively:
using System;
using System.Collections.Generic;
namespace MVCTemplate.Common.Entities
{
public class User
{
public virtual Guid UserID { get; set; }
public virtual string UserName { get; set; }
public virtual string Password { get; set; }
public virtual string FullName { get; set; }
public virtual string Email { get; set; }
public virtual TimeSpan LastLogin { get; set; }
public virtual bool IsActive { get; set; }
public virtual DateTime CreationDate { get; set; }
public virtual IList<Role> UserInRoles { get; set; }
public User()
{
UserInRoles = new List<Role>();
}
}
}
using System.Collections.Generic;
namespace MVCTemplate.Common.Entities
{
public class Role
{
public virtual int? RoleID { get; set; }
public virtual string RoleName { get; set; }
public virtual bool IsActive { get; set; }
public virtual string Description { get; set; }
public virtual IList<User> Users { get; set; }
//public virtual IList<RolePermission> RolePermission { get; set; }
public Role()
{
Users = new List<User>();
}
public virtual void AddUsers(User _user)
{
_user.UserInRoles.Add(this);
Users.Add(_user);
}
}
}
Now, In Mappings folder their mappings files is as under:
using FluentNHibernate.Mapping;
using MVCTemplate.Common.Entities;
namespace MVCTemplate.Common.Mappings
{
public class RoleMap : ClassMap<Role>
{
public RoleMap()
{
Table("tblRoles");
Id(role => role.RoleID).GeneratedBy.Identity();
Map(role => role.RoleName).Not.Nullable();
Map(role => role.IsActive).Not.Nullable();
Map(role => role.Description).Not.Nullable();
HasManyToMany(role => role.Users).Cascade.All().Table("tblUserInRoles");
//HasMany(role => role.User);
//HasMany(role => role.RolePermission);
}
}
}
using FluentNHibernate.Mapping;
using MVCTemplate.Common.Entities;
namespace MVCTemplate.Common.Mappings
{
public class UserMap : ClassMap<User>
{
public UserMap()
{
Table("tblUsers");
Id(user => user.UserID).GeneratedBy.Guid();
Map(user => user.UserName).Not.Nullable();
Map(user => user.Password).Not.Nullable();
Map(user => user.FullName).Not.Nullable();
Map(user => user.Email).Not.Nullable();
//Map(user => user.LastLogin).Nullable();
Map(user => user.IsActive).Not.Nullable();
Map(user => user.CreationDate).Not.Nullable();
HasManyToMany(user => user.UserInRoles).Cascade.All().Table("tblUserInRoles");
//HasMany(user => user.UserInRoles);
}
}
}
Now, from controller, I got specific user object in user object and now want to delete it, the simple code is as under:
using System;
using System.Collections.Generic;
using System.Web.Mvc;
using MVCTemplate.BussinessLayer.Facade;
using MVCTemplate.Common.Entities;
namespace MVCTemplate.Web.Controllers
{
public class HomeController : Controller
{
private UserManagement _userManagement;
public ActionResult Index()
{
ViewBag.Message = "Welcome to ASP.NET MVC!";
_userManagement = new UserManagement();
var oUser = _userManagement.GetUserBy(new Guid("4fb5856a-58d9-4b78-8d08-bce645bc93c7"));
oUser.UserInRoles = new List<Role>();
_userManagement.Delete(oUser);
return View();
}
public ActionResult About()
{
return View();
}
}
}
Now, I just want to delete that user as this user is not exist in any role and there is no entry of it in its junction table(UserInRole). I initialize its Role collection to empty for Count=0, but after calling deleting method it throw an error with sqlQuery which is as under:
could not delete collection: [MVCTemplate.Common.Entities.User.UserInRoles#4fb5856a-58d9-4b78-8d08-bce645bc93c7][SQL: DELETE FROM tblUserInRoles WHERE User_id = #p0]
Note that in Junction table tblUserInRole there no field of that name User_id as mentioned in error, due to which in the inner exception it is telling that column name User_id not exist. But in junction table I have only two field 1) UserID and 2) RoleID.
Any suggestion how to resolve it?

Answer 1

looks like a mapping error to me. Change:
HasManyToMany(user => user.UserInRoles).Cascade.All().Table("tblUserInRoles");
To
HasManyToMany(user => user.UserInRoles)
.Cascade.All()
.Table("tblUserInRoles")
.ParentKeyColumn("UserID")
.ChildKeyColumn("RoleID");