在JMS序列化期间使用什么方法?

I am modifying an API that uses Symfony 2.7 and JMS Serializer. I have an entity that includes some image data. In my entity definition, the relevant field is annotated as follows:

/**
 * @var string
 *
 * @ORM\Column(name="images_data", type="text")
 * @JMS\Groups({"default", "playlist", "digital_signage", "distributed_item"})
 * @JMS\Type("array")
 * @JMS\Accessor(getter="getImagesDataDecode")
 * @JMS\SerializedName("imagesData")
 */
private $imagesData;

... and I have changed the getImagesDataDecode() method to look like this:

public function getImagesDataDecode()
{
    return ['testone'=>'a','testtwo'=>'b'];
}

... but during testing, my API endpoint does not return the new test array. I can only conclude that the getImagesDataDecode() method is not being used during the API response.

How do I find out which method is being used to return API data?

I hope to make my program do a bit of analysis and filtering before returning the data in question. Without a place to insert that logic, it looks like I'm temporarily out of luck.

You are missing the @JMS\AccessType annotation to tell the serializer to use your Accessor method. It defaults to property and therefore it doesn't use any methods, it uses the property itself through a reflection.

https://jmsyst.com/libs/serializer/master/reference/annotations#accesstype