Doctrine: referenced object always null OneToMany / ManyToOne cascade - php

Question

Please tell me why the value of field 'pool_id' is always NULL in 'Question' Table?
(To add fiels 'Question' in the form used JS)
Pool.php
use Acme\ExamBundle\Entity\Question;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
*/
class Pool
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="string")
*/
protected $name;
/**
* #ORM\OneToMany(targetEntity="Question", mappedBy="pools",cascade={"persist"})
*/
protected $questions;
public function __construct()
{
$this->questions = new ArrayCollection();
}
public function getName()
{
return $this->name;
}
public function setName($name)
{
$this->name = $name;
}
public function getQuestions()
{
return $this->questions;
}
/**
* Add question
*
* #param \Acme\ExamBundle\Entity\Question $question
* #return Pool
*/
public function addQuestion(Question $question)
{
/*$question->addPool($this);
$this->questions->add($question);*/
if (!$this->questions->contains($question)) {
$this->questions->add($question);
}
}
/**
* Remove question
*
* #param \Acme\ExamBundle\Entity\Question $question
*/
public function removeQuestion(Question $question)
{
$this->questions->removeElement($question);
}
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set questions
*
* #param \Acme\ExamBundle\Entity\Question $questions
* #return Pool
*/
public function setQuestions(Question $questions = null)
{
$this->questions = $questions;
return $this;
}
}
Question.php
/**
* #ORM\Entity
*/
class Question
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="text")
*/
protected $description;
/**
* #ORM\Column(type="string")
*/
protected $variants;
/**
* #ORM\Column(type="string")
*/
protected $ansver;
/**
* #ORM\ManyToOne(targetEntity="Pool", inversedBy="questions")
* #ORM\JoinColumn(name="pool_Id", referencedColumnName="id")
*/
protected $pools;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set description
*
* #param string $description
* #return Question
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get description
*
* #return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set variants
*
* #param string $variants
* #return Question
*/
public function setVariants($variants='ok')
{
$this->variants = $variants;
return $this;
}
/**
* Get variants
*
* #return string
*/
public function getVariants()
{
return $this->variants;
}
/**
* Set ansver
*
* #param string $ansver
* #return Question
*/
public function setAnsver($ansver)
{
$this->ansver = $ansver;
return $this;
}
/**
* Get ansver
*
* #return string
*/
public function getAnsver()
{
return $this->ansver;
}
/**
* Set pools
*
* #param string $pools
* #return Question
*/
public function setPools($pools)
{
$this->pools = $pools;
return $this;
}
/**
* Get pools
*
* #return string
*/
public function getPools()
{
return $this->pools;
}
}
QuestionType
class QuestionType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('description');
$builder->add('variants');
$builder->add('ansver');
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\ExamBundle\Entity\Question',
));
}
public function getName()
{
return 'question';
}
}
PoolType
class PoolType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('name');
$builder->add('questions', 'collection', array(
'type' => new QuestionType(),
'allow_add' => true,
'allow_delete' => true,
'by_reference' => false,
));
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\ExamBundle\Entity\Pool',
));
}
public function getName()
{
return 'pool';
}
}
Thanks for your thoughts. Hope you can help me.

Answer 1

class Pool
/**
* #ORM\OneToMany(targetEntity="Question", mappedBy="pools",cascade={"persist"})
*/
protected $questions;
class Question
/**
* #ORM\ManyToOne(targetEntity="Pool", inversedBy="questions")
* #ORM\JoinColumn(name="pool_Id", referencedColumnName="id")
*/
protected $pools;
Using $pools to represent one pool is a bit confusing. You do understand that a OneToMany relation implies that a question can belong to at most one pool?
The reason that Question::pool_id is null is that you are not calling Question::setPools. Fix this by tweaking Pool:addQuestion
class Pool
public function addQuestion(Question $question)
{
/*$question->addPool($this);
$this->questions->add($question);*/
if (!$this->questions->contains($question)) {
$this->questions->add($question);
$question->setPools($this); // ADD THIS LINE
}
}
Looks like you almost had it in there. Maybe you changed the relation from a ManyToMany?
Also, change the column name from pool_Id to pool_id. SQL is not always consistent when dealing with mixed case names.
Finally, might want to change Ansver to Answer