Question

I have the following code that selects a bunch of comments from a database, but I only ever have one current post and I would like to deal only with comments regarding the current Post.

public ActionResult Index()
{
    ViewBag.PostCommentFK = new SelectList(db.Posts, "PostID", "PostTitle");
    return View();
}

I guess all I need is to add a where clause to the statement, “PostCurrent” is a Boolean and there can only ever be one “True” PostCurrent.

Currently in my view I have a hidden field with the value of 1 in it, so comments are only added to post 1, but would like that to be the current post.

@Html.HiddenFor(model => model.PostCommentFK, new { Value = 1 })

I then have a [HttpPost] method to SaveChanges,

 [HttpPost]
 public ActionResult Index(Comment comment)
 {
     if (ModelState.IsValid)
     {
         db.Comments.AddObject(comment);
         db.SaveChanges();
         return RedirectToAction("CommentResponse");  
     }

    ViewBag.PostCommentFK = new SelectList(db.Posts, "PostID", "PostTitle", comment.PostCommentFK);
    return View(comment);
}

Answer 1

I think you need to hide PostID instead value

@Html.HiddenFor(model => model.PostCommentFK.PostID)

Then :

 [HttpPost]
 public ActionResult Index(Comment comment)
 {
     if (ModelState.IsValid)
     {
         if(comment.PostID == 0)//New record
            db.Comments.AddObject(comment);
         else // Edit existing comment
            {
              var OldComment = db.Comments.Where(c => c.PostID == comment.PostID).SingleOrDefault();
              if (OldComment != null)
                {
                  OldComment.PostTitle = comment.PostTitle;
                  //Set all other properties...
                }
            }
         db.SaveChanges();
         return RedirectToAction("CommentResponse");  
     }

    ViewBag.PostCommentFK = new SelectList(db.Posts, "PostID", "PostTitle", comment.PostCommentFK);
return View(comment);
}