如何在实体symfony中显示最后一个数组？

Question

I don't know if this is possible in symfony, that is getting the last array when using respository. In my controller a have this function

/**
 * @param $id
 * @return Food
 */
public function getFood($id)
{

    $em = $this->getDoctrine()->getManager();
    $food = $em->getRepository("AppBundle:Food")->findById($id);
    if (!$food) {
        throw $this->createNotFoundException("Invalid Food");
    }

    return $food;
}

this will show the single food that I need. In my repository I have this code

/**
     * Display Food and get the last transaction
     * @param $id
     */
    public function findById($id){

        $query =  $this->createQueryBuilder(f)
            ->where('f.id = :id')
            ->setParameter('id', $id)
            ->getQuery()
            ->getResult()[0];

        return $query;
    }

This code successfully displaying the data of food Foods

 - id
 - name
 - price
 - packages
     - id
     - name_package
     - category
 - User
     - id
     - username
     - password
     - email
- transaction []
    1 - {
         - id
         - date
         - emailStatus
         - email
     }
    2 - {
         - id
         - date
         - emailStatus
         - email
     }
    3 - {
         - id
         - date
         - emailStatus
         - email
     }

How can I get the last transaction of food? I just want to display the last part of transaction that is like this one.

update

     - id
     - name
     - price
     - packages
         - id
         - name_package
         - category
     - User
         - id
         - username
         - password
         - email
    - transaction []
         3 - {
             - id
             - date
             - emailStatus
             - email
         }

Answer 1

Thanks everyone here. I have an idea now how to solve. What I did is just a simple way. In my Food entity class, I add this method

/**
     * @return Transactions
     */
    public function getLastTransactions()
    {
        $this->transactions = $this->getTransactions()->last();

        return $this->transactions;
    }

and then in my Food controller

 /**
     * @param $id
     * @return Food
     */
    public function getFood($id)
    {

        $em = $this->getDoctrine()->getManager();
        $food = $em->getRepository("AppBundle:Food")->find($id);
        $food->getLastTransactions();


        return $food;
    }

I can now control the transaction and then you can see the full info of my food entity.