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Bug #36102

open

In 1:n relationships the parent might get lost

Added by Björn Steinbrink over 12 years ago. Updated about 9 years ago.

Status:
New
Priority:
Must have
Assignee:
-
Category:
Extbase
Target version:
-
Start date:
2012-04-15
Due date:
% Done:

0%

Estimated time:
TYPO3 Version:
6.2
PHP Version:
Tags:
Complexity:
Is Regression:
No
Sprint Focus:

Description

Given two classes that have a 1:n relationship modelled by means of a parent field in the child table like this:

class Parent {
  /**
   * @var Tx_Extbase_Persistence_ObjectStorage<Child>
   */
  public $children;
}

class Child {
  /**
   * @var Parent
   */
  public $parent;
}

Updating the relationship can result in the child being stripped of its parent.

$newParent = $parentRepository->...;
$child = $childRepository->...;

$child->parent->children->remove($child),
$newParent->children->add($child);
$child->parent = $newParent;

This code sequence gives a consistent state in memory, but during persistAll(), extbase will set the child's parent to NULL.

This is because extbase tries to be smart and to fix the parent field in case that the user didn't fully update the involved parties, but just added the child to its new parent.

In the above scenario, the objects are saved in this order
  1. $newParent
  2. $child
  3. $oldParent
This leads to the following updates:
  1. In persistObjectStorage(), called for $newParent the parent field gets updated to the new parent uid.
  2. In persistObject() for $child the parent field gets updated to the new parent uid again.
  3. In persistObjectStorage() for $oldParent, the child is stripped of its parent by calling detachObjectFromParentObject()

Thus the child becomes orphaned.

This can be worked around by means of calling persistAll() yourself, because of another bug that causes ObjectStorages not to be marked as clean, thus they get persisted again when extbase calls persistAll() itself, but this time the detaching won't happen, because the clean state of the parent object has been updated.

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