Symfony 3.3 Form is returning NULL for one field - forms

Question

I'm trying to get INSERT values from a form into DB, one of my form fields is brand_id which is returning NULL upon submission.
There are two entities having Many to One relationship
Brand
id
name
Model
id
brand_id (FK)
name
image_url
comment
All fields return a value but the brand_id returns NULL
Code and Entitys are as follows:
brand Entity:
<?php
// src/coreBundle/Entity/Brand.php
namespace coreBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use coreBundle\Entity\Model;
use Doctrine\Common\Collections\ArrayCollection;
/**
*#ORM\Entity
*#ORM\Table(name="brand")
*/
class brand
{
/**
* #var int
* #ORM\Id
* #ORM\Column(name="id", type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
public $id;
/**
*#ORM\Column(type="string", length=100)
*/
private $name;
/**
*#ORM\OneToMany(targetEntity="model", mappedBy="brands")
*/
protected $models;
public function __construct()
{
$this->models = new ArrayCollection();
}
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* #param string $name
*
* #return brand
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Add model
*
* #param \coreBundle\Entity\model $model
*
* #return brand
*/
public function addModel(\coreBundle\Entity\model $model)
{
$this->models[] = $model;
return $this;
}
/**
* Remove model
*
* #param \coreBundle\Entity\model $model
*/
public function removeModel(\coreBundle\Entity\model $model)
{
$this->models->removeElement($model);
}
/**
* Get models
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getModels()
{
return $this->models;
}
}
model Entity :
<?php
// src/coreBundle/Entity/Model.php
namespace coreBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use coreBundle\Entity\Brand;
/**
*#ORM\Entity
*#ORM\Table(name="model")
*/
class model
{
/**
* #var int
* #ORM\Id
* #ORM\Column(name="id", type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
public $id;
/**
*#ORM\Column(type="integer")
*/
public $brand_id;
/**
*#ORM\Column(type="string", length=100)
*/
private $name;
/**
*#ORM\Column(type="string", length=100)
*/
private $image_url;
/**
*#ORM\Column(type="string", length=200)
*/
private $comment;
/**
*#ORM\ManyToOne(targetEntity="brand", inversedBy="models")
*#ORM\JoinColumn(name="brand_id", referencedColumnName="id")
*/
protected $brands;
/**
* #ORM\OneToOne(targetEntity="model_item", mappedBy="models")
*/
private $model_items;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set brandId
*
* #param integer $brandId
*
* #return model
*/
public function setBrandId($brandId)
{
$this->brand_id = $brandId;
return $this;
}
/**
* Get brandId
*
* #return integer
*/
public function getBrandId()
{
return $this->brand_id;
}
/**
* Set name
*
* #param string $name
*
* #return model
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
/**
* Set imageUrl
*
* #param string $imageUrl
*
* #return model
*/
public function setImageUrl($imageUrl)
{
$this->image_url = $imageUrl;
return $this;
}
/**
* Get imageUrl
*
* #return string
*/
public function getImageUrl()
{
return $this->image_url;
}
/**
* Set comment
*
* #param string $comment
*
* #return model
*/
public function setComment($comment)
{
$this->comment = $comment;
return $this;
}
/**
* Get comment
*
* #return string
*/
public function getComment()
{
return $this->comment;
}
/**
* Set brands
*
* #param \coreBundle\Entity\brand $brands
*
* #return model
*/
public function setBrands(\coreBundle\Entity\brand $brands = null)
{
$this->brands = $brands;
return $this;
}
/**
* Get brands
*
* #return \coreBundle\Entity\brand
*/
public function getBrands()
{
return $this->brands;
}
}
My Controller Code:
public function newModelAction(Request $request)
{
$product = $this->getDoctrine()
->getRepository('coreBundle:brand')
->findAll();
if (!$product) {
throw $this->createNotFoundException(
'No product found for id '.$productId
);
}
$model = new model();
$form = $this->createFormBuilder($model)
->add('brand_id',TextType::class,array('label'=>'Brand Id'))
->add('name',TextType::class,array('label'=>'Model Name'))
->add('comment',TextType::class,array('label'=>'Comments'))
->add('image_url',TextType::class,array('label'=>'Image URL'))
->add('save',SubmitType::class, array('label'=>'Add Model'))
->getForm();
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($model);
$em->flush();
return $this->render('coreBundle:layouts:newItem.html.twig',
array('form'=>$form->createView(),));
}
// ... do something, like pass the $product object into a template
return $this->render('coreBundle:layouts:newModel.html.twig',
array('form'=>$form->createView(),));
}

Answer 1

Try to remove this:
*#ORM\Column(type="integer")
*/
public $brand_id;
Because you have already the field for brands in this point:
/**
*#ORM\ManyToOne(targetEntity="brand", inversedBy="models")
*#ORM\JoinColumn(name="brand_id", referencedColumnName="id")
*/
protected $brands;
You need also to remove getter and seeter of brandId and remove brand_id from the form and adding this for example:
->add('brand', EntityType::class, array(
// query choices from this entity
'class' => 'AppBundle:Brand',
))

Answer 2

Try this
/**
*#ORM\ManyToOne(targetEntity="brand")
*#ORM\JoinColumn(nullable=false)
*/
protected $brands;