Set c_survey_answer.session_id as nullable

public/main/survey/surveyUtil.class.php

@@ -120,7 +120,7 @@ class SurveyUtil
             ->setQuestion($question)
             ->setOptionId($optionId)
             ->setValue((int) $optionValue)
-            ->setSessionId($sessionId)
+            ->setSessionId($sessionId ?: null)
         ;
 
         $em = Database::getManager();

src/CoreBundle/Migrations/Schema/V200/Version20201211114900.php

@@ -32,9 +32,11 @@ final class Version20201211114900 extends AbstractMigrationChamilo
         if ($schema->hasTable('c_survey_answer')) {
             $table = $schema->getTable('c_survey_answer');
             if (!$table->hasColumn('session_id')) {
-                $this->addSql(
-                    'ALTER TABLE c_survey_answer ADD session_id INT NOT NULL'
-                );
+                $this->addSql('ALTER TABLE c_survey_answer ADD session_id INT NULL');
+            } else {
+                $this->addSql('ALTER TABLE c_survey_answer CHANGE session_id session_id INT DEFAULT NULL');
+                $this->addSql('UPDATE c_survey_answer SET session_id = NULL WHERE session_id = 0');
+                $this->addSql('DELETE FROM c_survey_answer WHERE session_id IS NOT NULL AND session_id NOT IN (SELECT id FROM session)');
             }
             if (!$table->hasColumn('c_lp_item_id')) {
                 $this->addSql(

src/CourseBundle/Entity/CSurveyAnswer.php

@@ -34,8 +34,8 @@ class CSurveyAnswer
     #[ORM\Column(name: 'user', type: 'string', length: 250, nullable: false)]
     protected string $user;
 
-    #[ORM\Column(name: 'session_id', type: 'integer', nullable: false)]
-    protected int $sessionId;
+    #[ORM\Column(name: 'session_id', type: 'integer', nullable: true)]
+    protected ?int $sessionId;
 
     #[ORM\Column(name: 'c_lp_item_id', type: 'integer', nullable: false)]
     protected int $lpItemId;
@@ -120,24 +120,12 @@ class CSurveyAnswer
         return $this;
     }
 
-    /**
-     * Get session Id.
-     *
-     * @return int
-     */
-    public function getSessionId()
+    public function getSessionId(): ?int
     {
         return $this->sessionId;
     }
 
-    /**
-     * Set session Id.
-     *
-     * @param int $sessionId
-     *
-     * @return CSurveyAnswer
-     */
-    public function setSessionId($sessionId)
+    public function setSessionId(?int $sessionId = null): static
     {
         $this->sessionId = $sessionId;