improvement on import - person may have a null gender

Resources/migrations/Version20181005140249.php

@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace Application\Migrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Set person gender not null
+ */
+final class Version20181005140249 extends AbstractMigration
+{
+    public function up(Schema $schema) : void
+    {
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
+
+        $this->addSql('ALTER TABLE chill_person_person ALTER gender DROP NOT NULL');
+    }
+
+    public function down(Schema $schema) : void
+    {
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
+
+        $this->addSql('ALTER TABLE chill_person_person ALTER gender SET NOT NULL');
+    }
+}