Fixes #164 by introducing a PostLoad lifecycle callback for the viewpoint entity.

src/Game.php

@@ -273,6 +273,8 @@ class Game
             $v->save($this->getEntityManager());
         }
 
+        $v->setTwigSceneRenderer($this->getSceneRenderer());
+
         return $v;
     }
 

src/Models/Viewpoint.php

@@ -11,6 +11,8 @@ use Doctrine\ORM\Mapping\JoinColumn;
 use Doctrine\ORM\Mapping\ManyToOne;
 use Doctrine\ORM\Mapping\OneToOne;
 use Doctrine\ORM\Mapping\Table;
+use Doctrine\ORM\Mapping\PostLoad;
+use Doctrine\ORM\Mapping\HasLifecycleCallbacks;
 
 use LotGD\Core\Action;
 use LotGD\Core\ActionGroup;
@@ -28,6 +30,7 @@ use LotGD\Core\Tools\SceneDescription;
  * all changes from modules included.
  * @Entity
  * @Table(name="viewpoints")
+ * @HasLifecycleCallbacks
  */
 class Viewpoint implements CreateableInterface
 {
@@ -69,6 +72,16 @@ class Viewpoint implements CreateableInterface
         "owner",
     ];
 
+    /**
+     * @PostLoad
+     */
+    public function onLoad()
+    {
+        foreach ($this->actionGroups as $actionGroup) {
+            $actionGroup->setViewpoint($this);
+        }
+    }
+
     /**
      * Returns the owner.
      * @return Character

src/Services/TwigSceneRenderer.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace LotGD\Core\Services;
 
 
+use Doctrine\DBAL\Exception as DBALException;
 use LotGD\Core\Action;
 use LotGD\Core\Events\EventContextData;
 use LotGD\Core\Exceptions\CharacterNotFoundException;
@@ -35,8 +36,14 @@ class TwigSceneRenderer
         // the viewpoint itself.
         $eventManager = $this->game->getEventManager();
         $contextData = EventContextData::create(["templateValues" => []]);
-        $newContextData = $eventManager->publish("h/lotgd/core/scene-renderer/templateValues", $contextData);
+
-        $this->templateValues = $newContextData->get("templateValues") ?? [];
+        // Use try-catch here in case no database has yet been created. See #162
+        try {
+            $newContextData = $eventManager->publish("h/lotgd/core/scene-renderer/templateValues", $contextData);
+            $this->templateValues = $newContextData->get("templateValues") ?? [];
+        } catch (DBALException) {
+            $this->templateValues = [];
+        }
 
         // Add Sandbox extension
         $securityPolicy = $this->getSecurityPolicy();
@@ -125,7 +132,13 @@ class TwigSceneRenderer
             "methods" => $methods,
             "properties" => $properties,
         ]);
-        $newContextData = $eventManager->publish("h/lotgd/core/scene-renderer/securityPolicy", $contextData);
+
+        // Use try-catch here in case no database has yet been created. See #162
+        try {
+            $newContextData = $eventManager->publish("h/lotgd/core/scene-renderer/securityPolicy", $contextData);
+        } catch (DBALException) {
+            $this->templateValues = [];
+        }
 
         // Set changed values from the event.
         $tags = $newContextData->get("tags");

tests/Models/ViewpointTest.php

@@ -126,6 +126,8 @@ class ViewpointTest extends CoreModelTestCase
             $this->assertSame($should->getTitle(), $is->getTitle());
             $this->assertSame($should->getSortKey(), $is->getSortKey());
             $this->assertSame(count($should->getActions()), count($is->getActions()));
+
+            $this->assertSame($output, $is->getViewpoint());
         }
 
         $this->assertEquals($ag2->getTitle(), $input->findActionGroupById('id2')->getTitle());