One-To-One Relation: Duplicate user_id in Symfony - php

Question

I have a 2 entities with one to one relation. One User = One Cart and One Cart = One User. First, when i try to add product to the current logged in user bag there are no problems, but when i add the second product, it throws the following exception:
An exception occurred while executing 'INSERT INTO cart (name, price, image, user_id) VALUES (?, ?, ?, ?)' with params ["Olympus - TG-4", "379.99", "65d30071a19252f3361af3b2e134b0f4", 8]:
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '8' for key 'UNIQ_BA388B7A76ED395'
Here is User Entity:
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Validator\Constraints as Assert;
/**
* User
*
* #ORM\Table(name="users")
* #ORM\Entity(repositoryClass="AppBundle\Repository\UserRepository")
*/
class User implements UserInterface
{
const ROLE_USER = 'ROLE_USER';
const ROLE_EDITOR= 'ROLE_EDITOR';
const ROLE_ADMIN= 'ROLE_ADMIN';
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #Assert\Email(
* message = "The email '{{ value }}' is not a valid email."
* )
* #ORM\Column(name="email", type="string", length=255, unique=true)
*/
private $email;
/**
* #Assert\Length(
* min = 4,
* max = 10,
* minMessage = "Your username must be at least {{ limit }} characters long.",
* maxMessage = "Your username cannot be longer than {{ limit }} characters."
* )
* #var string
* #ORM\Column(name="username", type="string", length=255, unique=true)
*/
private $username;
/**
* #Assert\Length(
* min = 4,
* max = 20,
* minMessage = "Your name must be at least {{ limit }} characters long.",
* maxMessage = "Your name cannot be longer than {{ limit }} characters."
* )
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* #Assert\Length(
* min = 4,
* max = 10,
* minMessage = "Your password must be at least {{ limit }} characters long.",
* maxMessage = "Your password cannot be longer than {{ limit }} characters."
* )
* #var string
*
* #ORM\Column(name="password", type="string", length=255)
*/
private $password;
/**
* #var string
*
* #ORM\Column(name="image", type="string", length=255, nullable=true)
*/
private $image;
/**
* #Assert\Image(mimeTypes={"image/png", "image/jpeg"}, maxSize="5M")
*/
private $image_form;
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\Product", mappedBy="user")
*/
private $products;
/**
* #ORM\Column(name="role", type="string", length=255)
*/
private $role;
/**
* One user has One Cart
* #ORM\OneToOne(targetEntity="AppBundle\Entity\Cart", mappedBy="user")
*/
private $cart;
/**
* Get id
*
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* Set email
*
* #param string $email
*
* #return User
*/
public function setEmail($email)
{
$this->email = $email;
return $this;
}
/**
* Get email
*
* #return string
*/
public function getEmail()
{
return $this->email;
}
/**
* Set username
*
* #param string $username
*
* #return User
*/
public function setUsername($username)
{
$this->username = $username;
return $this;
}
/**
* Get username
*
* #return string
*/
public function getUsername()
{
return $this->username;
}
/**
* Set name
*
* #param string $name
*
* #return User
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Set password
*
* #param string $password
*
* #return User
*/
public function setPassword($password)
{
$this->password = $password;
return $this;
}
/**
* Get password
*
* #return string
*/
public function getPassword()
{
return $this->password;
}
/**
* Set image
*
* #param string $image
*
* #return User
*/
public function setImage($image)
{
$this->image = $image;
return $this;
}
/**
* Get image
*
* #return string
*/
public function getImage()
{
return $this->image;
}
/**
* #return mixed
*/
public function getImageForm()
{
return $this->image_form;
}
/**
* #param mixed $image_form
*/
public function setImageForm($image_form)
{
$this->image_form = $image_form;
}
/**
* Returns the roles granted to the user.
*
* <code>
* public function getRoles()
* {
* return array('ROLE_USER');
* }
* </code>
*
* Alternatively, the roles might be stored on a ``roles`` property,
* and populated in any number of different ways when the user object
* is created.
*
* #return (Role|string)[] The user roles
*/
public function getRoles()
{
return explode(',', $this->getRole());
}
/**
* Returns the salt that was originally used to encode the password.
*
* This can return null if the password was not encoded using a salt.
*
* #return string|null The salt
*/
public function getSalt()
{
return null;
}
/**
* Removes sensitive data from the user.
*
* This is important if, at any given point, sensitive information like
* the plain-text password is stored on this object.
*/
public function eraseCredentials()
{
return null;
}
public function getDefaultRole()
{
return self::ROLE_USER;
}
/**
* #return mixed
*/
public function getRole()
{
return $this->role;
}
/**
* #param mixed $role
*/
public function setRole($role)
{
$this->role = $role;
}
/**
* #param array $roles
*/
public function setRoles($roles){
$this->setRole(implode(',', $roles));
}
/**
* #return mixed
*/
public function getProducts()
{
return $this->products;
}
/**
* #param mixed $products
*/
public function setProducts($products)
{
$this->products = $products;
}
/**
* #return mixed
*/
public function getCart()
{
return $this->cart;
}
/**
* #param mixed $cart
*/
public function setCart($cart)
{
$this->cart = $cart;
}
}
Here is Cart Entity:
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
/**
* Cart
*
* #ORM\Table(name="cart")
* #ORM\Entity(repositoryClass="AppBundle\Repository\CartRepository")
*/
class Cart
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* #var string
*
* #ORM\Column(name="price", type="string", length=255)
*/
private $price;
/**
* #var string
*
* #ORM\Column(name="image", type="string", length=255, nullable=true)
*/
private $image;
/**
* #Assert\Image(mimeTypes={"image/png", "image/jpeg"}, maxSize="5M")
*/
private $image_form;
/**
* One cart has One User
* #ORM\OneToOne(targetEntity="AppBundle\Entity\User", inversedBy="cart")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
private $user;
/**
* Get id
*
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* #param string $name
*
* #return Cart
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Set price
*
* #param string $price
*
* #return Cart
*/
public function setPrice($price)
{
$this->price = $price;
return $this;
}
/**
* Get price
*
* #return string
*/
public function getPrice()
{
return $this->price;
}
/**
* Set image
*
* #param string $image
*
* #return Cart
*/
public function setImage($image)
{
$this->image = $image;
return $this;
}
/**
* Get image
*
* #return string
*/
public function getImage()
{
return $this->image;
}
/**
* #return mixed
*/
public function getImageForm()
{
return $this->image_form;
}
/**
* #param mixed $image_form
*/
public function setImageForm($image_form)
{
$this->image_form = $image_form;
}
/**
* #return mixed
*/
public function getUser()
{
return $this->user;
}
/**
* #param mixed $user
*/
public function setUser($user)
{
$this->user = $user;
}
}
And The Cart Controller:
<?php
namespace AppBundle\Controller;
use AppBundle\Entity\Cart;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\File\UploadedFile;
class CartController extends Controller
{
/**
* #Route("/cart/{id}", name="cart")
* #param $id
* #return \Symfony\Component\HttpFoundation\Response
*/
public function listUserCartAction($id)
{
$cart = $this->getDoctrine()->getRepository('AppBundle:Cart')->findAll($id);
return $this->render('cart/cart.view.html.twig', array(
'cart' => $cart
));
}
/**
* #Route("/cart/add/{id}", name="add_to_cart")
* #return \Symfony\Component\HttpFoundation\Response
* #internal param $id
*/
public function addToCartAction($id)
{
$cart = new Cart();
$product = $this->getDoctrine()->getRepository('AppBundle:Product')->find($id);
$productName = $product->getName();
$productPrice = $product->getPrice();
/** #var UploadedFile $file */
$filename = md5($product->getName());
//Get Current User Id
$user = $this->get('security.token_storage')->getToken()->getUser();
$cart->setName($productName);
$cart->setPrice($productPrice);
$cart->setImage($filename);
$cart->setUser($user);
$em = $this->getDoctrine()->getManager();
$em->persist($cart);
$em->flush();
return $this->render('cart/cart.view.html.twig');
}
}

Answer 1

The problem you have is based in the generation of the Database Schema, as the error says you have a constrain error, on a duplicated key (user_id).
You must change the UNIQUE INDEX, i think you should change it for INDEX(user_id)

Answer 2

It is because you have bidirectional one to one relation. Try removing the following code from User Entity
/**
* One user has One Cart
* #ORM\OneToOne(targetEntity="AppBundle\Entity\Cart", mappedBy="user")
*/
private $cart;
The problem is that for a particular user, you are creating a new cart for every product that is added. Instead, cart should just have id (primary key) and user_id and there should be a new table (cart_products) which has the mapping of product_id to card_id.