Override existing property with another

[mikolajzieba]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	yes/no
RFC?	no

I try to override one property with another on serialization, but I wasn't able to do so without removing target property from the serialized object.

I want to replace property "id" with property "fooBar".
When property "id" doesn't exists in the serialized object, it replaces it as desired, but when it exists - it doesn't.

It's caused by overriding virtualProperty config when source property exists: https://github.com/schmittjoh/serializer/blob/2.2.0/src/Metadata/Driver/YamlDriver.php#L86

Steps required to reproduce the problem

Serializer config:

      getFooBar:
        name: id
        serialized_name: id
        type: int

Serialized class:

class SomeClass {
 public $id;
 public $fooBar;
 public function getFooBar() {
    return $this->fooBar;
 }
}

$toSerialize = new SomeClass();
$toSerialize->id = 1;
$toSerialize->fooBar = 999;

Expected Result

{"id":"999"}

Actual Result

{"id":"1"}

[goetas]

This can already be achieved by using a virtual property as "id" filed. and inside there

function getId(){
   return $this->id ?: $this->fooBar;
}