fix error in recursive trigger on insert

Resources/migrations/Version20180911093642.php

@@ -0,0 +1,43 @@
+<?php declare(strict_types=1);
+
+namespace Application\Migrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Fix error with recursive trigger on update
+ */
+final class Version20180911093642 extends AbstractMigration
+{
+    public function up(Schema $schema) : void
+    {
+        $this->addSql("DROP TRIGGER canonicalize_user_on_update ON users");
+        
+        $this->addSql(<<<SQL
+            CREATE TRIGGER canonicalize_user_on_update
+              AFTER UPDATE
+              ON users
+              FOR EACH ROW 
+              WHEN (pg_trigger_depth() = 0)
+              EXECUTE PROCEDURE canonicalize_user_on_update();
+SQL
+        );
+
+    }
+
+    public function down(Schema $schema) : void
+    {
+        $this->addSql("DROP TRIGGER canonicalize_user_on_update ON users");
+            
+        $this->addSql(<<<SQL
+            CREATE TRIGGER canonicalize_user_on_update
+              AFTER UPDATE
+              ON users
+              FOR EACH ROW 
+              EXECUTE PROCEDURE canonicalize_user_on_update();
+SQL
+        );
+
+    }
+}