Symfony2 or Doctrine2 isn't unserializing values - symfony

Question

I serialize some values when I send to DB, now I need to unserialize them in order to iterate over them. In my entity I have this:
public function getValuesText() {
return $this->values_text;
}
and then in the template I show as:
{{ element.getValuesText }}
But I get this raw result:
a:3:{i:1;s:7:"Value 1";i:2;s:7:"Value 2";i:3;s:7:"Value 3";}
And I don't know how to iterate over it to get key, values, what is failing?
UPDATE: Include mapping information
Here is:
<?php
namespace ProductBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
use ProductBundle\DBAL\Types\StatusType;
use ProductBundle\DBAL\Types\FieldType;
use Fresh\Bundle\DoctrineEnumBundle\Validator\Constraints as DoctrineAssert;
/**
* #ORM\Entity
* #ORM\Table(name="product_detail")
* #Gedmo\SoftDeleteable(fieldName="deletedAt")
*/
class ProductDetail {
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\ManyToOne(targetEntity="ProductDetail")
* #ORM\JoinColumn(name="parent", referencedColumnName="id")
*/
protected $parent;
/**
* #ORM\Column(type="string", length=255)
*/
protected $description;
/**
* #ORM\Column(type="string", length=255)
*/
protected $label;
/**
* #var string $field_type
* #DoctrineAssert\Enum(entity="ProductBundle\DBAL\Types\FieldType")
* #ORM\Column(name="field_type", type="FieldType", nullable=false)
*/
protected $field_type;
/**
* #ORM\Column(name="values_text", type="array")
*/
protected $values_text;
/**
* #ORM\Column(type="string", length=255)
*/
protected $measure_unit;
/**
* #var string $status
* #DoctrineAssert\Enum(entity="ProductBundle\DBAL\Types\StatusType")
* #ORM\Column(name="status", type="StatusType", nullable=false)
*/
protected $status;
/**
* #Gedmo\Timestampable(on="create")
* #ORM\Column(name="created", type="datetime")
*/
protected $created;
/**
* #Gedmo\Timestampable(on="update")
* #ORM\Column(name="modified", type="datetime")
*/
protected $modified;
/**
* #ORM\Column(name="deletedAt", type="datetime", nullable=true)
*/
protected $deletedAt;
/**
* #ORM\ManyToMany(targetEntity="CategoryBundle\Entity\Category", inversedBy="pd_category", cascade={"persist"})
* #ORM\JoinTable(name="product_detail_has_category",
* joinColumns={#ORM\JoinColumn(name="detail", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="category", referencedColumnName="id")}
* )
*/
protected $category;
/**
* #ORM\ManyToMany(targetEntity="ProductBundle\Entity\DetailGroup", inversedBy="productDetail", cascade={"persist"})
* #ORM\JoinTable(name="detail_group_has_product_detail",
* joinColumns={#ORM\JoinColumn(name="detail", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="kgroup", referencedColumnName="id")}
* )
*/
protected $detail_group;
/**
* #ORM\Column(name="to_product", type="boolean")
*/
protected $to_product;
public function __construct() {
$this->detail_group = new \Doctrine\Common\Collections\ArrayCollection();
$this->category = new \Doctrine\Common\Collections\ArrayCollection();
}
public function getId() {
return $this->id;
}
public function setParent(ProductDetail $parent = null) {
$this->parent = $parent;
}
public function getParent() {
return $this->parent;
}
public function setDescription($description) {
$this->description = $description;
}
public function getDescription() {
return $this->description;
}
public function setLabel($label) {
$this->label = $label;
}
public function getLabel() {
return $this->label;
}
public function setFieldType($field_type) {
$this->field_type = $field_type;
}
public function getFieldType() {
return $this->field_type;
}
public function setValuesText($values_text) {
$this->values_text = $values_text;
}
public function getValuesText() {
return $this->values_text;
}
public function setMeasureUnit($measure_unit) {
$this->measure_unit = $measure_unit;
}
public function getMeasureUnit() {
return $this->measure_unit;
}
public function setStatus($status) {
$this->status = $status;
}
public function getStatus() {
return $this->status;
}
public function setCreated($param) {
$this->created = $param;
return true;
}
public function getCreated() {
return $this->created;
}
public function setModified($param) {
$this->modified = $param;
return true;
}
public function getModified() {
return $this->modified;
}
public function setCategory(\CategoryBundle\Entity\Category $category) {
$this->category[] = $category;
}
public function getCategory() {
return $this->category;
}
public function setDetailGroup(\ProductBundle\Entity\DetailGroup $detailGroup) {
$this->detail_group[] = $detailGroup;
}
public function getDetailGroup() {
return $this->detail_group;
}
public function getDeletedAt() {
return $this->deletedAt;
}
public function setDeletedAt($deletedAt) {
$this->deletedAt = $deletedAt;
}
public function setToProduct($to_product) {
$this->to_product = $to_product;
}
public function getToProduct() {
return $this->to_product;
}
}

Answer 1

Ok, after read and check my code I realize where the problem was:
Doctrine DBAL takes care for serialize/unserialize by using type="array" check here for more info
I made a mistake when I insert values since I was doing a unwanted serialize since as I said before Doctrine take care of this. See below:
Incorrect:
$entity->setValuesText(serialize($form->get('values_text')->getData()));
Correct:
$entity->setValuesText($form->get('values_text')->getData());
That's all, hope is helpful for someone else

Answer 2

Doctrine 2 DBAL ArrayType doesn't check for an array and serialize every type of parameter.
Control your database, that value should be a serialized string starting with s:
Ref: https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/Types/ArrayType.php