how to sort an entity's arrayCollection in symfony2

Question

I have an entity "container" with this property

/**
 * @ORM\OneToMany(targetEntity="BizTV\ContentManagementBundle\Entity\Content", mappedBy="container")
 */
private $content;

the property is an array collection...

public function __construct() {
    $this->content = new \Doctrine\Common\Collections\ArrayCollection();
}

...with these two standard methods

/**
 * Add content
 *
 * @param BizTV\ContentManagementBundle\Entity\Content $content
 */
public function addContent(\BizTV\ContentManagementBundle\Entity\Content $content)
{
    $this->content[] = $content;
}

/**
 * Get content
 *
 * @return Doctrine\Common\Collections\Collection 
 */
public function getContent()
{
    return $this->content;
}

Now my question is, is there a smooth way to build a sorting feature into this, perhaps on the getContent() call? I am no php wiz and certainly not seasoned in symfony2 but I learn as I go.

The content entity itself has a sorting INT like this that I want to sort it on:

/**
 * @var integer $sortOrder
 *
 * @ORM\Column(name="sort_order", type="integer")
 */
private $sortOrder; 

Answer 1

You should be able to use the @ORM\OrderBy statement which allows you to specify columns to order collections on:

/**
 * @ORM\OneToMany(targetEntity="BizTV\ContentManagementBundle\Entity\Content", mappedBy="container")
 * @ORM\OrderBy({"sort_order" = "ASC"})
 */
private $content;

In fact this may be a duplicate of How to OrderBy on OneToMany/ManyToOne

Edit

Checking for implementation advice it appears that you must fetch the tables with a join query to the collection in order for the @ORM\OrderBy annotation to work: http://www.krueckeberg.org/notes/d2.html

This means that you must write a method in the repository to return the container with the contents table joined.