Mention the adder/remover support of PropertyInfo

[javiereguiluz]

This fixes #7182.

[dunglas]

Perfect. Thank you very much for documenting this @javiereguiluz!

[dunglas]

After a second check, I think that the property will be considered writable if it has associated adder and remover methods. If only one of them is present, the PropertyAccessor component cannot update reliably the array, and so doesn't do it.

Should be:

<?php

<?php

class SomeClass
{
    private $analyses;
    private $feet;

    public function addAnalyse(Dummy $analyse)
    {
        // ...
    }

    public function removeAnalyse(Dummy $analyse)
    {
        // ...
    }

    public function addFoot(Dummy $foot)
    {
        // ...
    }

    public function removeFoot(Dummy $foot)
    {
        // ...
    }
}

[javiereguiluz]

Thanks for reviewing Kévin. This is a bit confusing, because I took the original example from the tests of your pull request: https://github.com/symfony/symfony/pull/18337/files#diff-cf4f68ffc8f26be7f990461bb282f50cR126

[javiereguiluz]

I have checked this again and you are right ... it checks by default both array mutator methods (add and remove) to determine if it's writable or not. Thanks!