MVC :: Debugging Controller / View Data Flow
Feb 23, 2010
I've started using ASP.NET MVC on a project and have gotten a few working pages, but I recently ran into a problem where data I was carrying through a hidden field didn't carry for some reason. I can think of a couple of possible reasons and I could try things until something works but I prefer to work on observable empirical data. Thus the point of this inquiry.
I've got a controller (several), a model (several), a view (several), and data in the browser for the JavaScript to chew on. I can unit test my JavaScript code. The browser / view interactions go over the wire, and I can capture that either with Firebug or (if I want to punish myself) Ethereal. I can write unit tests for the controller and for components of the model. The thing that appears to happen in a pure "black box" is the mapping between the model objects and the view form fields. Somewhere in that process, it tries to map data from form fields into model objects before it hands a request to the controller and it tries to map data from the model objects to form fields when it processes the response. Even with the helpers in play, this is a source of bugs. There can be spelling disconnects, or a page might be inadvertently missing one of the fields of a model object because it didn't use it. It would be nice to know if a field didn't map and why.
Since it is happening on the server, this seems like the handoffs should be unit testable or at least loggable. The problem seems pretty bounded. I can't be the first person to have run into this question. Are there any hooks I can use for this? What are the best observation points in the framework to tap the process, both incoming and outgoing?
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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