Symfony2 one to one relationship form

Question

I need some help to understand what I'm doing wrong, I've tried to search one answer here, but nothing work.

here my problem..

I have two entities with a one-to-one relationship:

...
class FarmInfo
{
    ...

    /**
     * @var integer
     *
     * @ORM\Column(name="areaCovered", type="integer", nullable=true)
     */
    private $areaCovered;

    /**
     * @var integer
     *
     * @ORM\Column(name="totalIrrigatedArea", type="integer", nullable=true)
     */
    private $totalIrrigatedArea;

    /**
     * @var integer
     *
     * @ORM\Column(name="totalStaff", type="integer", nullable=true)
     */
    private $totalStaff;

    /**
     * @var DairyInfo
     * @ORM\OneToOne(targetEntity="DairyInfo", mappedBy="farmInfo", cascade={"persist","remove"})
     */
    private $dairyInfo;

    ...
}

and

...
class DairyInfo
{
    ...

    /**
     * @var FarmInfo
     *
     * @ORM\OneToOne(targetEntity="FarmInfo", inversedBy="dairyInfo", cascade={"persist"})
     * @ORM\JoinColumn(name="farmInfoId", referencedColumnName="id")
     * 
     */
    private $farmInfo;

    /**
     * @var integer
     *
     * @ORM\Column(name="peakCowMilked", type="integer", nullable=true)
     */
    private $peakCowMilked;

    /**
     * @var integer
     *
     * @ORM\Column(name="cowsMilkedInWinter", type="smallint", nullable=true)
     */
    private $cowsMilkedInWinter;

    ...
}

here the formTypes:

class FarmInfoType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('areaCovered');
        $builder->add('totalIrrigatedArea');
        $builder->add('totalStaff');

        $builder->add('dairyInfo', new DairyInfoType());
    }

    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'FOO\CoreBundle\Entity\FarmInfo'
        ));
    }

    /**
     * @return string
     */
    public function getName()
    {
        return 'foo_corebundle_farminfo';
    }
}

class DairyInfoType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('peakCowMilked');
        $builder->add('cowsMilkedInWinter');
    }

    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'FOO\CoreBundle\Entity\DairyInfo'
        ));
    }

    /**
     * @return string
     */
    public function getName()
    {
        return 'foo_corebundle_dairyinfo';
    }
}

That create the form for me with the FarmInfo and the DairyInfo in the same form as I want, but when I persist, FarmInfo persist ok and the DairyInfo persist all fields but the farmInfoId is always null:

+---------------+--------------------+------------+
| peakCowMilked | cowsMilkedInWinter | farmInfoId |
+---------------+--------------------+------------+
|            11 |                 11 |       NULL |
+---------------+--------------------+------------+

What do I have to do to symfony get this Id automatically ?

Thank you all for advance.

Answer 1

You didn't show your methods but I am fairly certain you have:

class FarmInfo
{
    setDairyInfo($dairyInfo)
    {
        $this->dairyInfo = $dairyInfo;
    }
}

The problem is that nothing is setting farmInfo in your dairyInfo class. So modify setDairyInfo to:

    setDairyInfo($dairyInfo)
    {
        $this->dairyInfo = $dairyInfo;
        $dairyInfo->setFarmInfo($this);
    }

And you should be good to go.