/**
     * Many Cars have One Category
     * @ORM\ManyToOne(targetEntity="CarRental\Car\CarCategory")
     * @ORM\JoinColumn(name="category",referencedColumnName="categoryID",onDelete="SET NULL")
     */
    protected $category;
 
    private function setCategory($category)
    {
        $this->category = $category;
    }
 
    public function getCategory()
    {
        return $this->category;
    }
[code]
Category:
[code]
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $categoryID;
 
    public function getCategoryID()
    {
        return $this->categoryID;
    }
 
    public function setCategoryID($categoryID)
    {
        $this->categoryID = $categoryID;
    }
 
    /**
     * @ORM\Column(type="string")
     */
    protected $category;
 
    public function setCategory($category)
    {
        $this->category = $category;
    }
 
    public function getCategory()
    {
        return $this->category;
    }
 
    public function __construct()
    {
        $this->cars = new ArrayCollection();
    }