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POWhat is the best practice for adding persistence to an MVC model?
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copied!<p>I'm in the process of implementing an ultra-light MVC framework in PHP. It seems to be a common opinion that the loading of data from a database, file etc. should be independent of the Model, and I agree. What I'm unsure of is the best way to link this "data layer" into MVC.</p> <hr> <h3>Datastore interacts with Model</h3> <pre><code>//controller public function update() { $model = $this->loadModel('foo'); $data = $this->loadDataStore('foo', $model); $data->loadBar(9); //loads data and populates Model $model->setBar('bar'); $data->save(); //reads data from Model and saves } </code></pre> <h3>Controller mediates between Model and Datastore</h3> <p>Seems a bit verbose and requires the model to know that a datastore exists.</p> <pre><code>//controller public function update() { $model = $this->loadModel('foo'); $data = $this->loadDataStore('foo'); $model->setDataStore($data); $model->getDataStore->loadBar(9); //loads data and populates Model $model->setBar('bar'); $model->getDataStore->save(); //reads data from Model and saves } </code></pre> <h3>Datastore extends Model</h3> <p>What happens if we want to save a Model extending a database datastore to a flatfile datastore?</p> <pre><code>//controller public function update() { $model = $this->loadHybrid('foo'); //get_class == Datastore_Database $model->loadBar(9); //loads data and populates $model->setBar('bar'); $model->save(); //saves } </code></pre> <h3>Model extends datastore</h3> <p>This allows for Model portability, but it seems wrong to extend like this. Further, the datastore cannot make use of any of the Model's methods.</p> <pre><code>//controller extends model public function update() { $model = $this->loadHybrid('foo'); //get_class == Model $model->loadBar(9); //loads data and populates $model->setBar('bar'); $model->save(); //saves } </code></pre> <h3>EDIT: Model communicates with DAO</h3> <pre><code>//model public function __construct($dao) { $this->dao = $dao; } //model public function setBar($bar) { //a bunch of business logic goes here $this->dao->setBar($bar); } //controller public function update() { $model = $this->loadModel('foo'); $model->setBar('baz'); $model->save(); } </code></pre> <hr> <p>Any input on the "best" option - or alternative - is most appreciated.</p>

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