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hdmf-dev__hdmf-683

This is a preserved training example. Membership in the current training wave has not been verified.
hdmf-dev/hdmf · Task 75 of 169

Problem statement

Adding child to parent container does not always mark parent as modified 
## Description

If a child container already has a parent and that child is added to a new container (so a link will be made in the ObjectMapper), then currently, the new container is not marked as modified. This is relevant when exporting. Adding a link to an existing object would not mark the file as modified, so it would not get rebuilt.

## Steps to Reproduce

```python
child_obj1 = Container('test child 1')
obj1 = ContainerWithChild()
obj1.set_modified(False)  # set to False so that we can test that it is set to True next
obj1.field1 = child_obj1
self.assertTrue(obj1.modified)
self.assertIs(obj1.field1, child_obj1)

obj3 = ContainerWithChild()
obj3.set_modified(False)  # set to False so that we can test that it is set to True next
obj3.field1 = child_obj1  # child_obj1 already has a parent
self.assertTrue(obj3.modified)
self.assertIs(obj3.field1, child_obj1)
```
```python
obj1 = Container('obj1')
obj2 = Container('obj2')
obj1.parent = obj2
foo = Foo()   # Foo is a MultiContainerInterface
foo.set_modified(False)  # set to False so that we can test whether add_container makes it True
foo.add_container(obj1)
self.assertTrue(foo.modified)  # fails


```
## Environment

<!--Please describe your environment according to the following bullet points.-->

    Python Executable: Conda
    Python Version: Python 3.9
    Operating System: Windows
    HDMF Version: dev

## Checklist

- [x] Have you ensured the bug was not already [reported](https://github.com/hdmf-dev/hdmf/issues) ?
- [x] Have you included a brief and descriptive title?
- [x] Have you included a clear description of the problem you are trying to solve?
- [x] Have you included a minimal code snippet that reproduces the issue you are encountering?
- [x] Have you checked our [Contributing](https://github.com/hdmf-dev/hdmf/blob/dev/docs/CONTRIBUTING.rst) document?

Training membership

opd_e4b_pure_v6a opd_e4b_pure_v6b

Task issues extracted from preserved verified_rft_messages training examples. This is not a verified current RL wave manifest.

Task and snapshot provenance

Snapshot captured 2026-11-12T17:06:59.476467+00:00 · Autoresearch-Arena/gemma-4-developer-agent

{
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  "examples": 4,
  "instance_id": "hdmf-dev__hdmf-683",
  "problem_statement": "Adding child to parent container does not always mark parent as modified \n## Description\r\n\r\nIf a child container already has a parent and that child is added to a new container (so a link will be made in the ObjectMapper), then currently, the new container is not marked as modified. This is relevant when exporting. Adding a link to an existing object would not mark the file as modified, so it would not get rebuilt.\r\n\r\n## Steps to Reproduce\r\n\r\n```python\r\nchild_obj1 = Container('test child 1')\r\nobj1 = ContainerWithChild()\r\nobj1.set_modified(False)  # set to False so that we can test that it is set to True next\r\nobj1.field1 = child_obj1\r\nself.assertTrue(obj1.modified)\r\nself.assertIs(obj1.field1, child_obj1)\r\n\r\nobj3 = ContainerWithChild()\r\nobj3.set_modified(False)  # set to False so that we can test that it is set to True next\r\nobj3.field1 = child_obj1  # child_obj1 already has a parent\r\nself.assertTrue(obj3.modified)\r\nself.assertIs(obj3.field1, child_obj1)\r\n```\r\n```python\r\nobj1 = Container('obj1')\r\nobj2 = Container('obj2')\r\nobj1.parent = obj2\r\nfoo = Foo()   # Foo is a MultiContainerInterface\r\nfoo.set_modified(False)  # set to False so that we can test whether add_container makes it True\r\nfoo.add_container(obj1)\r\nself.assertTrue(foo.modified)  # fails\r\n\r\n\r\n```\r\n## Environment\r\n\r\n<!--Please describe your environment according to the following bullet points.-->\r\n\r\n    Python Executable: Conda\r\n    Python Version: Python 3.9\r\n    Operating System: Windows\r\n    HDMF Version: dev\r\n\r\n## Checklist\r\n\r\n- [x] Have you ensured the bug was not already [reported](https://github.com/hdmf-dev/hdmf/issues) ?\r\n- [x] Have you included a brief and descriptive title?\r\n- [x] Have you included a clear description of the problem you are trying to solve?\r\n- [x] Have you included a minimal code snippet that reproduces the issue you are encountering?\r\n- [x] Have you checked our [Contributing](https://github.com/hdmf-dev/hdmf/blob/dev/docs/CONTRIBUTING.rst) document?",
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}
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  "captured_at": "2026-11-12T17:06:59.476467+00:00",
  "membership": "archived training",
  "membership_evidence": "Task issues extracted from preserved verified_rft_messages training examples. This is not a verified current RL wave manifest.",
  "name": "Preserved post-training task archive",
  "source": "Autoresearch-Arena/gemma-4-developer-agent",
  "source_revision": "016496de222aaafca0d4ee4c18efc63ba616f76e",
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