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[PropertyAccess] Document nullsafe operator usage #17288

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Oct 4, 2022
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[PropertyAccess] Document nullsafe operator usage #17288

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33 changes: 33 additions & 0 deletions components/property_access.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,9 @@ method::
// Symfony\Component\PropertyAccess\Exception\NoSuchIndexException
$value = $propertyAccessor->getValue($person, '[age]');

// You can avoid the exception by adding the nullsafe operator
$value = $propertyAccessor->getValue($person, '[age?]');

You can also use multi dimensional arrays::

// ...
Expand Down Expand Up @@ -101,6 +104,36 @@ To read from properties, use the "dot" notation::

var_dump($propertyAccessor->getValue($person, 'children[0].firstName')); // 'Bar'

.. tip::

You can give an object graph with nullable object.

Given an object graph ``comment.person.profile``, where ``person`` is optional (can be null),
you can call the property accessor with ``comment.person?.profile`` (using the nullsafe
operator) to avoid exception.

For example::

class Person
{
}
class Comment
{
public ?Person $person = null;
public string $message;
}

$comment = new Comment();
$comment->message = 'test';

// This code throws an exception of type
// Symfony\Component\PropertyAccess\Exception\UnexpectedTypeException
var_dump($propertyAccessor->getValue($comment, 'person.firstname'));

// The code now returns null, instead of throwing an exception of type
// Symfony\Component\PropertyAccess\Exception\UnexpectedTypeException,
var_dump($propertyAccessor->getValue($comment, 'person?.firstname')); // null

.. caution::

Accessing public properties is the last option used by ``PropertyAccessor``.
Expand Down