How to pick up only one entity from the collection when serializing an object using JMSSerializerBundle?

Question

symfony

Used by : Symfony 4.1, FOSRestBundle, JMSSerializerBundle
There is an entity Articlethat has a one-to-many two-way relationship with ArticleImage.

class Article
{

  private $id;

  ...

  /**
   * @ORM\OneToMany(targetEntity="ArticleImage", mappedBy="article")
   */
  private $images;

  ...
}

class ArticleImage
{

  private $id;

  private $file;

  ...

  /**
   * @ORM\ManyToOne(targetEntity="Article", inversedBy="images")
   */
  private $article;

  private $isPreview;

  ...
}

There are two serialization contexts: list and detail . How can I set it up so that in the list context , only one entity ArticleImagethat $isPreviewhas a value of true, and not the entire collection, gets into the result?
There is an idea to hang up an EventListener and, depending on the context, manually remove all unnecessary ArticleImageitems from the collection before serialization, but somehow this option seems to me not the most optimal.

Answer 1

The easiest way is to make a method like getPreview. In it, give the desired element and serialize it as a VirtualProperty