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POIs my Linq-SQL breaking my MVC2 model binding?
 

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  1. POIs my Linq-SQL breaking my MVC2 model binding?
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    <p>I am trying to handle the http-post from a web form using MVC 2s built in model binding. From what I have been searching through for the past few hours I have figured it is a bit finicky with "objects within objects." </p> <p>I'm looking for any kind of answers or links to resources that may help me figure this out. I'm still in the early stages of this also so if there is a better way - I'm all ears. I have been writing the Linq-SQL myself and not using the code generation. I think the closest answer I'm looking for is <a href="https://stackoverflow.com/questions/4273443/asp-net-mvc2-linq-to-sql-relationship-entities-select-list-model-binding">here</a>, but I'm still not getting it.</p> <p>Model Client (my best guess for where the issue is):</p> <pre><code>public class Client { public int ClientID { get; set; } ... [Column(Name = "Address_id")] internal int AddressID { get; set; } internal EntityRef&lt;Address&gt; _address; [System.Data.Linq.Mapping.Association(ThisKey = "AddressID", Storage = "_address")] public Address Address { get { return _address.Entity; } internal set { _address.Entity = value; AddressID = value.AddressID; } } } </code></pre> <p>Model Address (within client entity)</p> <pre><code>public class Address { [Column] public string Address1 { get; set; } [Column] public string Address2 { get; set; } [Column] public string City { get; set; } ... </code></pre> <p>View Model:</p> <pre><code> public class ClientFormViewModel { public Client Client { get; set; } ... } </code></pre> <p>View:</p> <pre><code> &lt;!-- id is hidden --&gt; &lt;%: Html.EditorFor(m =&gt; m.Client.ClientID) %&gt; ... &lt;%: Html.EditorFor(m =&gt; m.Client.Address.AddressID) %&gt; &lt;%: Html.LabelFor(m =&gt; m.Client.Address.Address1) %&gt; &lt;%: Html.EditorFor(m =&gt; m.Client.Address.Address1) %&gt;&lt;br /&gt; &lt;%: Html.LabelFor(m =&gt; m.Client.Address.Address2) %&gt; &lt;%: Html.EditorFor(m =&gt; m.Client.Address.Address2) %&gt;&lt;br /&gt; ... </code></pre> <p>Controller:</p> <pre><code> public ViewResult Edit(int clientId) { var client = clientsRepository.Clients.First(x =&gt; x.ClientID == clientId); ... // create view model var viewModel = new ClientFormViewModel { Client = client, ... }; return View(viewModel); } [HttpPost] public ActionResult Edit(ClientFormViewModel clientForm) { if (ModelState.IsValid) { clientsRepository.SaveClient(clientForm.Client); return RedirectToAction("List"); } else // validation error, so redisplay the same view ... } </code></pre> <p>So my issue is... when I get into the HttpPost action, the <em>clientForm.Client.Address</em> is always <em>null</em>. Although, when I look into the <em>ModelState</em> (which is valid), or use <em>Request.["key"]</em>, all of the keys match the structure of my object. For example, I see <em>ModelState["Client.Address.Address1"]</em>, <em>"Client.Address.Address2"</em>, etc.</p> <p>All other basic properties are filled in fine, which make me think the linq-sql code is breaking the model binding. But how? And is there a way to fix it? If those keys are within the Request/ModelState dictionary, why are they not being mapped to the object? Am I totally missing something obvious?</p>
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    1. COSomething you might want to try and do is pass your viewmodel to the view to render then bind your model in the post action. I don't think you are making it easier for yourself by swapping that around :).
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    2. COMaybe it is nested too deep? I do something similar, but my EditorFor lambda is model.Email.EmailAddress, so I am successfully using one less level of nesting. Also, can you post the html that is rendered for your form? Maybe the Ids/Names aren't getting rendered correctly.
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    3. COI don't think the level of nesting would be an issue. You will most likely find that the issue is due to the values being passed to the default model binder not matching the model being bound for whatever reason. You can always try and register your own model binder to check exactly what is being passed to the binder (or just look at the HTML as jlnors suggested :))
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