Manage Roles for Users in MVC 3 application

Question

I am trying to add and delete aspnet roles for any user in a MVC 3 application.

I only need to work with 3 tables which are described below.

My problems are:

1. I need to display the user's existing selected Roles, and other roles available but not selected for the user using "Checkboxes"

2. I need to save the selected values to table aspnet_UsersInRoles table

This is what I have done so far:

1. I have created ViewModels called AssignedRolesData.cs
2. I have altered the models for aspnet_Users and aspnet_Users to hold the icollection navigation properties for aspnet_UsersInRoles
3. I have created a method for the UserController Called "PopulateAssignedRoleData" to populate the existing Roles per user

My problems:

1. I cannot get the selected roles into the checkboxes
2. I don't know how to save them afterwards
3. The keys are of type GUID

Models

**using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace WWW.Models
{
    public class aspnet_Roles
    {

        public Guid ApplicationId { get; set; }
        [Key]
        public Guid RoleId { get; set; }
        public string RoleName { get; set; }
        public string LoweredRoleName { get; set; }
        public string Description { get; set; }
        public virtual ICollection<aspnet_Users> aspnet_User { get; set; }
    }
}
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace WWW.Models
{
    public class aspnet_Users
    {
        public Guid ApplicationId { get; set; }
        [Key]
        public Guid UserId { get; set; }
        public string UserName { get; set; }
        public string LoweredUserName { get; set; }
        public string MobileAlias { get; set; }
        public bool IsAnonymous { get; set; }
        public DateTime LastActivityDate { get; set; }
        public virtual ICollection<aspnet_Roles> aspnet_Role { get; set; }
    }
}**

ViewModels

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace WWW.ViewModels
{
    public class AssignedRolesData
    {
        public Guid RoleId { get; set; }
        public string RoleName { get; set; }
        public bool Assigned { get; set; }
    }
}

UserController

   public ActionResult Edit(Guid id)
        {
            aspnet_Users aspnet_User = db.aspnet_Users
            .Include(i => i.UserId)
                //.Include(i => i.aspnet_User)
            .Where(i => i.UserId == id)
            .Single();
            PopulateAssignedRoleData(aspnet_User);
            return View(aspnet_User);

        }


 private void PopulateAssignedRoleData(aspnet_Roles aspnet_Role)
        {
            var allaspnet_Users = db.aspnet_Users;
            var UsersInRoles = new HashSet<Guid>(aspnet_Role.aspnet_User.Select(c => c.UserId));
            var viewModel = new List<AssignedRolesData>();
            foreach (var user in allaspnet_Users)
            {
                viewModel.Add(new AssignedRolesData
                {
                    RoleId = aspnet_Role.RoleId,
                    RoleName = aspnet_Role.RoleName,
                    Assigned = UsersInRoles.Contains(aspnet_Role.RoleId)
                });
            }
            ViewBag.Courses = viewModel;
        }

My Edit View

<div class="editor-field">
            <table>
                <tr>
                    @{
                        int cnt = 0;
                        List<www.ViewModels.AssignedRolesData> Roles = ViewBag.aspnet_Role;

                        foreach (var Role in Roles)
                        {
                            if (cnt++ % 3 == 0) {
                                @:  </tr> <tr> 
                            }
                            @: <td> 
                                <input type="checkbox" 
                                       name="selectedRoles" 
                                       value="@Role.RoleId" 
                                       @(Html.Raw(Role.Assigned ? "checked=\"checked\"" : "")) /> 
                                @Role.RoleId @:  @Role.RoleName
                            @:</td>
                        }
                        @: </tr>
                    }
            </table>
        </div>

        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>

Tables

aspnet_Users Table  
ApplicationId   uniqueidentifier
UserId  uniqueidentifier
UserName    nvarchar(256)
LoweredUserName nvarchar(256)
MobileAlias nvarchar(16)
IsAnonymous bit
LastActivityDate    datetime


aspnet_Roles Table  
ApplicationId   uniqueidentifier
RoleId  uniqueidentifier
RoleName    nvarchar(256)
LoweredRoleName nvarchar(256)
Description nvarchar(256)



aspnet_UsersInRoles Table   
UserId  uniqueidentifier
RoleId  uniqueidentifier

Answer 1

You need to post you view so we can see how you are trying to create the check boxes.

To answer your second problem, you can do something like this:

public ActionResult UpdateRoles(string userName, string[] roles)
{
    // Remove the user from all roles, you could use more logic
    // to see what the changes are and if you need to remove a role
    // but this is just to get you started
    string[] userRoles = Roles.GetRolesForUser(user.UserName);        
    if(userRoles.Count() > 0)
    {
        foreach(string role in userRoles)
        {
            Roles.RemoveUserFromRoles(userName, role);
        }
    }

    // then you just add the user to the submitted roles
    foreach(string role in roles)
    {
        Roles.AddUserToRole(UserName, role);
    }