Entity City for Symfony Project

City.php

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Gedmo\Mapping\Annotation as Gedmo;


/**
 * AppBundle\Entity\City
 *
 * @ORM\Table(name="tb_city")
 * @ORM\Entity(repositoryClass="AppBundle\Entity\CityRepository")
 */

 class City {
     
     /**
     * @var integer $id
     *
     * @ORM\Id
     * @ORM\Column(type="string")
     * @ORM\GeneratedValue(strategy="NONE")
     */
     
    protected $id;


    /**
     * @ORM\Column(type="string")
     * @Assert\NotBlank()
     * @Assert\Length( max = "100" )
     */
    
    protected $name;
    
    /**
     * @ORM\ManyToOne(targetEntity="State", inversedBy="cities")
     * @ORM\JoinColumn(name="state_id", referencedColumnName="id")
     */
    
    protected $state;



     public function __toString() {
        
        return $this->name;
        
    }
    /**
     * Constructor
     */
    public function __construct()
    {
        $this->customers = new \Doctrine\Common\Collections\ArrayCollection();
    }

    /**
     * Set id
     *
     * @param string $id
     * @return City
     */
    public function setId($id)
    {
        $this->id = $id;

        return $this;
    }

    /**
     * Get id
     *
     * @return string 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return City
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set state
     *
     * @param State $state
     * @return City
     */
    public function setState(State $state = null)
    {
        $this->state = $state;

        return $this;
    }

    /**
     * Get state
     *
     * @return State
     */
    public function getState()
    {
        return $this->state;
    }
}