Allow projects to be deleted with ./bin/remove destroy.

Summary: Fixes T5235. Implement `PhabricatorDestructableInterface` on `PhabricatorProject` so that projects can be deleted with `./bin/remove destroy`.

Test Plan: Created (and then destroyed) a test project. Verified that the corresponding objects (project, slugs and workboard columns) were removed from the database.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5235

Differential Revision: https://secure.phabricator.com/D9352

src/applications/project/storage/PhabricatorProject.php

@@ -5,7 +5,8 @@ final class PhabricatorProject extends PhabricatorProjectDAO
     PhabricatorFlaggableInterface,
     PhabricatorPolicyInterface,
     PhabricatorSubscribableInterface,
-    PhabricatorCustomFieldInterface {
+    PhabricatorCustomFieldInterface,
+    PhabricatorDestructableInterface {
 
   protected $name;
   protected $status = PhabricatorProjectStatus::STATUS_ACTIVE;
@@ -247,4 +248,27 @@ final class PhabricatorProject extends PhabricatorProjectDAO
   }
 
 
+/* -(  PhabricatorDestructableInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+      $this->delete();
+
+      $columns = id(new PhabricatorProjectColumn())
+        ->loadAllWhere('projectPHID = %s', $this->getPHID());
+      foreach ($columns as $column) {
+        $engine->destroyObject($column);
+      }
+
+      $slugs = id(new PhabricatorProjectSlug())
+        ->loadAllWhere('projectPHID = %s', $this->getPHID());
+      foreach ($slugs as $slug) {
+        $slug->delete();
+      }
+
+    $this->saveTransaction();
+  }
+
 }

src/applications/project/storage/PhabricatorProjectColumn.php

@@ -2,7 +2,8 @@
 
 final class PhabricatorProjectColumn
   extends PhabricatorProjectDAO
-  implements PhabricatorPolicyInterface {
+  implements PhabricatorPolicyInterface,
+  PhabricatorDestructableInterface {
 
   const STATUS_ACTIVE = 0;
   const STATUS_DELETED = 1;
@@ -87,4 +88,15 @@ final class PhabricatorProjectColumn
     return pht('Users must be able to see a project to see its board.');
   }
 
+
+/* -(  PhabricatorDestructableInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+    $this->delete();
+    $this->saveTransaction();
+  }
+
 }