When your application is all about data, it's good to begin with the model. Remember that the job of a model is to manage the storage, retrieval, and processing of our application's data, usually with respect to its persistent storage format (in this case, CSV). To accomplish this, our model should contain all the knowledge about our data.
Currently, our application has nothing like a model; knowledge about the application's data is scattered into the form fields, and the Application object simply takes whatever data the form contains and stuffs it directly into a CSV file when a save operation is requested. Since we aren't yet retrieving or updating information, our application has no actual knowledge about what's ...
