asp.net-mvc-3 - コントローラーで IEnumerable から ICollection を更新する

Question

コントローラーに次のコードがあります。

public ActionResult SaveRecommendedUserDetails(RecommendAFriendViewModel model)
    {
      if (ModelState.IsValid)
      {
        Entities.RecommendedUser recommendedUser = new Entities.RecommendedUser();
        recommendedUser.Email = model.Email;
        recommendedUser.Firstname = model.Firstname;
        recommendedUser.Surname = model.Surname;
        recommendedUser.Users_UserId = model.UserId;
        recommendedUser.JobTitle = model.JobTitle;
        recommendedUser.Department = model.Department;
        ICollection<Entities.Group.Group> group;  

        foreach (group in model.Groups)
        {
            //add the goups from my viewmodel to the entity??
        }           

        ZincService.RecommendedUserService.CreateRecommendedUser(recommendedUser);

        return RedirectToAction("RecommendedUsers");
      }
      else
      {
        return View("Index", model);
      }
    }

public class RecommendAFriendViewModel
{
public int UserId { get; set; }

[LocalizedRequired]
[DataType(DataType.EmailAddress)]
public string Email { get; set; }

[LocalizedRequired]
public string Firstname { get; set; }

[LocalizedRequired]
public string Surname { get; set; }
public string Department { get; set; }
public string JobTitle { get; set; }
public DateTime? DateAndTimeProcessed { get; set; }
public DateTime? DateAndTimeRecommended { get; set; }
public IEnumerable<DataModels.Group.GroupDataModel> Groups { get; set; }


public class RecommendedUser
{
public virtual int RecommendedUserId { get; set; }
public virtual string Firstname { get; set; }
public virtual string Surname { get; set; }
public virtual string Email { get; set; }
public virtual string Department { get; set; }
public virtual string JobTitle { get; set; }
public virtual DateTime? DateAndTimeProcessed { get; set; }
public virtual int Users_UserId { get; set; }
public virtual DateTime? DateAndTimeRecommended { get; set; }
public virtual int AssignedUserId { get; set; }
public virtual ICollection<Group.Group> Groups { get; set; }

}

namespace Zinc.Entities.Group

{ public class Group { #region プロパティ

public virtual int GroupId { get; set; }
public virtual string Name { get; set; }
public virtual bool IsArchived { get; set; }
public virtual bool IsSegment { get; set; }
public virtual bool AllowFiltering { get; set; }

public virtual string SmallImageUrl { get; set; }
public virtual string MediumImageUrl { get; set; }
public virtual string LargeImageUrl { get; set; }

 private ICollection<RecommendedUser> _groupRecommendedUsers;
public virtual ICollection<RecommendedUser> RecommendedUsers
{
  get
  {
    if (_groupRecommendedUsers == null)
      _groupRecommendedUsers = new List<RecommendedUser>();

    return _groupRecommendedUsers;
  }
  set
  {
    _groupRecommendedUsers = value;
  }
}

誰か助けてください。

Answer 1

これを試して

recommendedUser.group = model.Groups.Select(g => new GroupDataModel { "Initialize fields"})
.ToList();