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POfubumvc - simple forms validation using IFailureValidationPolicy
 

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  1. POfubumvc - simple forms validation using IFailureValidationPolicy
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    <p>I've been trying to implement form validation correctly and a discussion on fubu mailing list has been the most helpful (<a href="http://groups.google.com/group/fubumvc-devel/browse_thread/thread/d54b135fe0254653/12180cd86e9dc50b" rel="nofollow">http://groups.google.com/group/fubumvc-devel/browse_thread/thread/d54b135fe0254653/12180cd86e9dc50b</a>). I'm still not entirely clear on certain points, I'm a newbie so I'm going through some yak shaving. </p> <p>It seems like the example given in the discussion performed the validation within the controller itself using IsValid(model).</p> <p>I'm trying to avoid this by decorating my input model with validation attributes such as Required and then use the validation configuration to Transfer on failure (via a policy).</p> <pre><code>this.Validation(x =&gt; { x.Actions .Include(call =&gt; call.HasInput &amp;&amp; call.InputType().Name.EndsWith("Input")); x.Failures .ApplyPolicy&lt;AccountValidationFailedPolicy&gt;(); }); </code></pre> <p>And here's the class that implments the policy:</p> <pre><code>public class AccountValidationFailedPolicy : IValidationFailurePolicy { public bool Matches(ValidationFailure context) { return (context.InputType() == typeof (RegisterAccountInput)); } public void Handle(ValidationFailure context) { var incomingRequest = (RegisterAccountInput) context.InputModel; var failedValidation = new RegisterationFailedNotification { CVV = incomingRequest.CVV, AcceptTerms = incomingRequest.AcceptTerms, Countries = incomingRequest.Countries, PhoneNumber = incomingRequest.PhoneNumber, PIN = incomingRequest.PIN }; FubuContinuation.TransferTo(failedValidation); } } </code></pre> <p>Handle simply tries to Transfer to another action via a new model, copying the values into the new model so that I can redisplay them again on the form. </p> <p>I must be doing something wrong here, because it's not transferring anywhere. I have a class with this method which I was hoping would handle it.</p> <p>public AccountViewModel New(RegisterationFailedNotification notification) { .... }</p> <p>Am I on track here, or is there something fundamental that I'm not getting? Perhaps a policy is not the thing to do here?</p>
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