My suggestion

Author: yvoyer

AbstractCreateCalculationHandler.php

@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * This class is used as date_class in form component
+ */
+class CalculationCommand
+{
+    const BASIC_TYPE = 'basic_calculaction_type';
+
+    public $subTotal;
+    public $quantity;
+}

CalculationCommand.php

@@ -0,0 +1,53 @@
+<?php
+
+class CalculationController
+{
+    /**
+     * @var CalculationHandler
+     */
+    private $handler;
+
+    /**
+     * @param CalculationHandler $handler
+     */
+    public function __construct(CalculationHandler $handler) {
+        $this->handler = $handler;
+    }
+
+    /**
+     * @Route("/calculation/{type}")
+     * @Template()
+     */
+    public function indexAction($type)
+    {
+        $command = $this->getFormData($type);
+
+        $this->handler->handle($command); // todo would probably be the command bus
+
+        // Get ID from entity and redirect, no return values required
+    }
+
+    /**
+     * @param string $type
+     *
+     * @return CalculationCommand
+     */
+    private function getFormData($type)
+    {
+        // todo this could be a calculation mapper service
+        $mapping = [
+            CalculationCommand::BASIC_TYPE => CalculationCommand::class,
+        ];
+
+        // Form handling generates the configured command object
+        /**
+         * @var CalculationCommand $command
+         */
+        $command = new $mapping[$type];
+        $command->quantity = 12;
+        $command->subTotal = 1000;
+
+        // Form would configure the command with values
+        return $command;
+    }
+}

CalculationController.php

@@ -0,0 +1,59 @@
+<?php
+
+class CalculationHandler
+{
+    /**
+     * @var EntityManager
+     */
+    private $entityManager;
+
+    /**
+     * @var TokenStorageInterface
+     */
+    private $tokenStorage;
+
+    /**
+     * @var Session
+     */
+    private $session;
+
+    /**
+     * @var Translator
+     */
+    private $translator;
+
+    /**
+     * @param EntityManager $entityManager
+     * @param TokenStorageInterface $tokenStorage
+     * @param Session $session
+     * @param Translator $translator
+     *
+     * FIXME null values here are just to make prototype work
+     */
+    public function __construct(
+        EntityManager $entityManager,
+        TokenStorageInterface $tokenStorage = null,
+        Session $session = null,
+        Translator $translator = null
+    ) {
+        $this->entityManager = $entityManager;
+        $this->tokenStorage = $tokenStorage;
+        $this->session = $session;
+        $this->translator = $translator;
+    }
+
+    /**
+     * @param CalculationCommand $command
+     */
+    public function handle($command)
+    {
+        // transfer required args from command to construct. that way object is in valid state
+        $entity = new DormerCalculation();// Command could contain necessary args for this object construct
+        $entity->addPrice('total', $command->subTotal, $command->quantity);
+
+        $this->entityManager->persist($entity);
+        $this->entityManager->flush();
+
+        // do other stuff with entity (translator etc.)
+    }
+}