Added missing serializer

Change-Id: I4f7c6b62039c1739da3d3b5a0e1dc02be4f9020a
Signed-off-by: smarcet <smarcet@gmail.com>

app/ModelSerializers/SerializerRegistry.php

@@ -178,6 +178,7 @@ final class SerializerRegistry
         $this->registry['PrivatePresentationCategoryGroup'] = PrivatePresentationCategoryGroupSerializer::class;
         $this->registry['Tag'] = TagSerializer::class;
         $this->registry['Language'] = LanguageSerializer::class;
+        $this->registry['PresentationExtraQuestionAnswer'] = PresentationExtraQuestionAnswerSerializer::class;
         // track questions
         $this->registry['TrackAnswer'] = TrackAnswerSerializer::class;
         $this->registry['TrackQuestionValueTemplate'] = TrackQuestionValueTemplateSerializer::class;

app/ModelSerializers/Summit/Presentation/PresentationExtraQuestionAnswerSerializer.php

@@ -0,0 +1,63 @@
+<?php namespace ModelSerializers;
+/**
+ * Copyright 2021 OpenStack Foundation
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+use Libs\ModelSerializers\AbstractSerializer;
+use models\summit\PresentationExtraQuestionAnswer;
+/**
+ * Class PresentationExtraQuestionAnswerSerializer
+ * @package ModelSerializers
+ */
+final class PresentationExtraQuestionAnswerSerializer
+    extends ExtraQuestionAnswerSerializer
+{
+    protected static $array_mappings = [
+        'PresentationId'    => 'presentation_id:json_int',
+    ];
+
+    /**
+     * @param null $expand
+     * @param array $fields
+     * @param array $relations
+     * @param array $params
+     * @return array
+     */
+    public function serialize($expand = null, array $fields = array(), array $relations = array(), array $params = array())
+    {
+        $answer = $this->object;
+        if (!$answer instanceof PresentationExtraQuestionAnswer) return [];
+        $values = parent::serialize($expand, $fields, $relations, $params);
+
+        if (!count($relations)) $relations = $this->getAllowedRelations();
+
+        if (!empty($expand)) {
+            $exp_expand = explode(',', $expand);
+            foreach ($exp_expand as $relation) {
+                $relation = trim($relation);
+                switch ($relation) {
+
+                    case 'presentation':
+                        {
+
+                            unset($values['presentation_id']);
+                            $values['presentation'] = SerializerRegistry::getInstance()->getSerializer($answer->getPresentation())
+                            ->serialize(AbstractSerializer::getExpandForPrefix($relation, $expand));
+                        }
+                        break;
+
+                }
+            }
+        }
+        return $values;
+    }
+}