Callback on serializer Symfony

Question

I\'m running Symfony 2.7 and I\'m trying output an object (Doctrine entity) as JSON.

When I\'m normalizing the object I want to convert some of it\'s values. To do t

Answer 1

You can use callback normalizer of K. Dunglas component.

You can see that in ObjectNormalizer (in normalize method)

if (isset($this->callbacks[$attribute])) {
    $attributeValue = call_user_func($this->callbacks[$attribute], $attributeValue);
 }

This mean that you must use in callback array key the name of property you wan't to normalize.

For example in my entity I have field named "name" of type "pgarray" (like array for postgresql). I wan't to normalize this data. Instead array I want a string.

/**
     * $object represent the property "name" because callback is attached to name property (setCallback)
     */
    $nameCallback = function ($object, $outerObject = null) {
        return $object[0];      
    };
    $this->normalizer->setCallbacks(['name' => $dateCallback]);

Just remember since Symfony 4.2 you must use $context in DI to use callback.