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POHow to prevent a ModelBinder error in a mandatory fields of a list?
 

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  1. POHow to prevent a ModelBinder error in a mandatory fields of a list?
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    <p>I've got this object created from EntityFramework from my database.</p> <pre><code>[EdmEntityTypeAttribute(NamespaceName="ContactCoreModel", Name="TargetLang")] [Serializable()] [DataContractAttribute(IsReference=true)] public partial class TargetLang : EntityObject { #region Factory Method /// &lt;summary&gt; /// Create a new TargetLang object. /// &lt;/summary&gt; /// &lt;param name="idTarget"&gt;Initial value of the idTarget property.&lt;/param&gt; /// &lt;param name="idLang"&gt;Initial value of the idLang property.&lt;/param&gt; /// &lt;param name="name"&gt;Initial value of the name property.&lt;/param&gt; public static TargetLang CreateLinguaTarget(global::System.Int32 idTarget, global::System.Int32 idLang, global::System.String name) { TargetLang targetLang = new TargetLang(); targetLang.idTarget = idTarget; targetLang.idLang = idLang; targetLang.name = name; return targetLang; } #endregion [...] /// &lt;summary&gt; /// No Metadata Documentation available. /// &lt;/summary&gt; [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)] [DataMemberAttribute()] public global::System.String name { get { return _nome; } set { OnnomeChanging(value); ReportPropertyChanging("name"); _nome = StructuralObject.SetValidValue(value, false); ReportPropertyChanged("name"); OnnomeChanged(); } } } </code></pre> <p>In my Create View I'll do something like</p> <pre><code>&lt;% using (Html.BeginForm()) { %&gt; &lt;% foreach (var lang in Env.ActiveLangs) { %&gt; &lt;fieldset&gt; &lt;legend&gt;Data for language &lt;%: lang.name %&gt;&lt;/legend&gt; &lt;% var targetLang = Model.targetsLangs.FirstOrDefault(lt =&gt; lt.idLang.Equals(lang.id)) ?? new TargetLang(); %&gt; &lt;div class="editor-label"&gt; &lt;%: Html.Hidden("targetLangs.Index", lang.id)%&gt; &lt;%: Html.Hidden("targetLangs[" + lang.id + "].idLingua", lang.id)%&gt; &lt;%: Html.Hidden("targetLangs[" + lang.id + "].idTarget", Model.id)%&gt; &lt;%= Html.Label("targetLangs_" + lang.id + "__name", "name")%&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;%: Html.TextBox("targetLangs[" + lang.id + "].name", targetLang.name)%&gt; &lt;%: Html.ValidationMessage("targetLangs[" + lang.id + "].name")%&gt; &lt;/div&gt; &lt;/fieldset&gt; &lt;% } %&gt; &lt;p&gt; &lt;input type="submit" value="Create" /&gt; &lt;/p&gt; &lt;% } %&gt; </code></pre> <p>And in my Controllers</p> <pre><code>[HttpPost] public ActionResult Create(IList&lt;TargetLang&gt; targetLangs) { if (ModelState.IsValid) { _repTargetsLangs.Add(targetLangs); _repTargetsLangs.Save(); return RedirectToAction("Index"); } return View(target); } </code></pre> <p>The problem is that ModelState is always invalid, because you can submit only a name for all the languages - you haven't to translate the target in all languages -, but the name is mandatory for db, so the model Binder raises an error.</p> <p>My question is: <em>where I have to operate, to correct this error?</em><br> At the Model binder level?<br> In the Controller before the ModelState.IsValis call? And how?</p> <p>I'm sure this case has happened to many, but I can't find an elegant, scalable solution.<br> Thanks.</p>
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