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POMVC3 Json model binding not working when sent to server
 

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    <p>I'm having a an odd problem with MVC3 and the model binding. When I post a JSON object to my controller the model binder can't create a typed object out of it at all. All the properties are the default (i.e. empty strings)</p> <p>However if I create an instance on the server, and send it as a JSON action result the data on the wire looks identical.</p> <p>I've tried with </p> <pre><code>$.ajaxSettings.traditional = true; </code></pre> <p>and it makes no difference</p> <p>As an example if I post </p> <pre><code>{"RoutineName":"My new routine","Routines":[{"DayName":"Monday","Items":[21,31]}]} </code></pre> <p>The model binder fails, but coming from the server the data looks like</p> <pre><code>{"RoutineName":"Routine From Code","Routines":[{"DayName":"Monday","Items":[1,2]},{"DayName":"Tuesday","Items":[]}]} </code></pre> <p>The html used to generate this looks like</p> <pre><code>$('#submitRoutine').click(function () { var routines = []; $('.DayName').each(function (index, item) { var $item = $(item); var name = $item.html(); var routineItems = []; $($item.attr('href')).find('.itemId').each(function () { routineItems.push(parseInt($(this).val(), 10)); }); routines.push({ DayName: name, Items: routineItems }); }); var routine = { RoutineName: $('#routineName').val(), Routines: routines }; $.ajaxSettings.traditional = true; $.post('/Machine/CreateRoutine', JSON.stringify(routine),function (data) {},'json'); }); </code></pre> <p>So it looks like model binding from a typed object to JSON is ok, but coming back the other way isn't. Is there something I've missed?</p> <p>The models are in F#</p> <pre><code>type RoutineDayViewModel() = let mutable _name = String.Empty let mutable _items = new ResizeArray&lt;int&gt;() member x.DayName with get() = _name and set value = _name &lt;- value member x.Items with get() = _items and set value = _items &lt;- value type RoutineViewModel() = let mutable _name = String.Empty let mutable _routines = new ResizeArray&lt;RoutineDayViewModel&gt;() member x.RoutineName with get() = _name and set value = _name &lt;- value member x.Routines with get() = _routines and set value = _routines &lt;- value </code></pre> <p>EDIT: I've also tried with the following C# classes and get the same result</p> <pre><code> public class RoutineDayViewModel { public string DayName { get; set; } public List&lt;int&gt; Items{ get; set; } } public class RoutineViewModel { public string RoutineName { get; set; } public List&lt;RoutineDayViewModel&gt; Routines { get; set; } } </code></pre> <p>I've also added the following to the global.asax</p> <pre><code>ValueProviderFactories.Factories.Add(new JsonValueProviderFactory()) </code></pre> <p>Thanks</p>
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    1. COWhat does your model look like? You're using getters and setters right?
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    2. COyeah they're F# models but have getters and setters just as a C# class would. I've added the model code to my question. ResizeArray is an F# name for List<T>
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    3. COI know in C# you have to explicitly state that a controller allows JSON GET requests or else it will reject them. Have you done that for your controllers? *My bad you're posting ><
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