The form's client data is expected to be of type scalar, but is an instance of class Doctrine\ORM\PersistentCollection

Condition.php

<?php

namespace GamerCertified\TeamBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * GamerCertified\TeamBundle\Entity\Conditions
 *
 * @ORM\Table(name="conditions")
 * @ORM\Entity(repositoryClass="GamerCertified\TeamBundle\Entity\ConditionsRepository")
 */
class Condition
{
    /**
     * @var integer $id
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string $name
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;

    /**
     * @var integer $team
     *
     * @ORM\ManyToOne(targetEntity="GamerCertified\TeamBundle\Entity\Team", inversedBy="conditions")
     */
    private $team;


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

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

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

    /**
     * Set team
     *
     * @param integer $team
     *
     * @return Conditions
     */
    public function setTeam($team)
    {
        $this->team = $team;
        return $this;
    }

    /**
     * Get team
     *
     * @return integer
     */
    public function getTeam()
    {
        return $this->team;
    }

    public function __toString()
    {
        return (string) $this->getName();
    }
}

ConditionType.php

<?php

namespace GamerCertified\TeamBundle\Form\Type\Team;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class ConditionType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder->add('name');
    }

    public function getName()
    {
       return 'condition';
    }

    public function getDefaultOptions()
    {
    	return array('data_class' => 'GamerCertified\TeamBundle\Entity\Condition');
    }
}

LinkFormType.php

<?php

namespace GamerCertified\RecruitmentBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class LinkForm extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder->add('url', null, array());

        $builder->add('type', 'entity' , array(
            'class' => 'GamerCertified\RecruitmentBundle\Entity\LinkType',
            'multiple' => false,
            'expanded' => false,
        ));
    }

    public function getDefaultOptions()
    {
        return array('data_class' => 'GamerCertified\RecruitmentBundle\Entity\Link');
    }

    public function getName()
    {
       return 'link_create';
    }

}

Team.php

<?php

namespace GamerCertified\TeamBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

use GamerCertified\UserBundle\Entity\User;
use GamerCertified\GameBundle\Entity\Game;

use Doctrine\Common\Collections\ArrayCollection;
use Gedmo\Mapping\Annotation as Gedmo;
use Symfony\Component\Validator\Constraints as Assert;


/**
 * GamerCertified\TeamBundle\Entity\Team
 * @ORM\Table(name="team")
 * @ORM\Entity(repositoryClass="GamerCertified\TeamBundle\Entity\TeamRepository")
 *
 */
class Team
{

    /**
     * @ORM\OneToMany(targetEntity="GamerCertified\TeamBundle\Entity\Condition", mappedBy="team", cascade={"all"}, orphanRemoval=true)
     */
    private $conditions;

    /**
     * @ORM\OneToMany(targetEntity="GamerCertified\RecruitmentBundle\Entity\Link", mappedBy="team", cascade={"all"}, orphanRemoval=true)
     */
    private $links;


    public function __construct($user)
    {
        $this->creator    = $user;
        $this->links      = new ArrayCollection;
        $this->conditions = new ArrayCollection;
    }

    public function setLinks($links)
    {
        $this->links = $links;
    }

    public function getLinks()
    {
        return $this->links;
    }

    public function addLink($link)
    {
        $this->links->add($link);
    }

    public function removeLink($object)
    {
        $this->links->remove($object);
    }

    public function setConditions($conditions)
    {
        $this->conditions = $conditions;
    }

    public function getConditions()
    {
        return $this->conditions;
    }

    public function addCondition($condition)
    {
        $this->conditions->add($condition);
    }

    public function removeCondition($object)
    {
        $this->conditions->remove($object);
    }

    public function __toString()
    {
        return $this->getSlug();
    }

}

TeamType.php

<?php

namespace GamerCertified\TeamBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

use GamerCertified\TeamBundle\Form\Type\Team\ConditionType;
use GamerCertified\RecruitmentBundle\Form\Type\LinkForm;

class TeamType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder->add('conditions', 'collection', array(
                'type' => new ConditionType(),
                'allow_add' => true,
                'single_control' => false,
                'allow_delete' => true,
                'show_legend' => false,
                'prototype' => true,
                'options' => array(
                    'data_class' => 'GamerCertified\TeamBundle\Entity\Condition',
                    'label_render' => false,
                    'required' => false,
                    'widget_control_group' => false,
                    'attr' => array('class' => 'span3'),
                )
        ));

        $builder->add('links', 'collection', array(
                'type' => new LinkForm,
                'single_control' => false,
                'allow_add' => true,
                'show_legend' => false,
                'allow_delete' => true, // should render default button, change text with widget_remove_btn
                'prototype' => true,
                'options' => array( // options for collection fields
                    'data_class' => 'GamerCertified\RecruitmentBundle\Entity\Link',
                    'required' => false,
                    'label_render' => false,
                    'widget_control_group' => false,
                    'attr' => array('class' => 'span3')
                )
        ));

    }

    public function getDefaultOptions()
    {
        return array(
            'data_class' => 'GamerCertified\TeamBundle\Entity\Team',
        );
    }

    public function getName()
    {
       return 'team_edit';
    }

}