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PODDD, Doctrine2, Aggregates and ArrayCollection : how isolate domain model?
 

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    <p>I'm trying to work effectively with <strong>DDD</strong> and <strong>Doctrine2</strong> on a project with lot of business logic.</p> <p>This is pretty new to me, I'm a reading many articles and code examples to understand the main principles and practices of DDD.</p> <p>I understand that <strong>we need decouple the domain objects</strong> from other concepts related to the system, ie in a layered architecture, "the domain layer" must be isolate from other layers, like the persistence layer / service (Doctrine2 for me).</p> <p>But there is one thing it's hard to understand for me : in several code examples of ddd with doctrine2, <strong>aggregates in domain entities are managed with Doctrine ArrayCollection</strong>, I found this kind of code :</p> <pre><code>namespace Acme\Domain\Model\Users; use Doctrine\Common\Collections\ArrayCollection; class User{ //... /** * Collection of Roles * * @var Collection of Roles */ protected $roles; /** * Constructor. */ public function __construct() { $this-&gt;createdAt = new \DateTime(); $this-&gt;roles = new ArrayCollection(); } public function getRoles() { return $this-&gt;roles; } //... } </code></pre> <p>For me, this implementation create a <strong>high coupling between domain models and the persistence service</strong>, Doctrine2. </p> <p>On the other hand, if DDD Entity and Doctrine Entity classes are decoupled, there is to many layers / classes, in my opinion. What do you think ? Is there a better way to avoid / handle this ?</p>
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    1. COYou mentioned "lots of business logic". Consider starting a new question focusing on just one business rule that you feel might benefit from DDD.
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