recovering-deleted-wagtail-pages/slides.md

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# Recovering deleted Wagtail pages and Django models

### Jake Howard

###### Senior Systems Engineer @ Torchbox
###### Security Team @ Wagtail
###### Performance Working Group @ Wagtail

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# Setting the scene

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# Site history report

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# Restoring from backups

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# _Partial_ restores from backups

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# 1. Spin up a database backup

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# 2. Locate the page models

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```python
from wagtail.models import Page

sysadmin_page = Page.objects.get(id=91)

child_pages = sysadmin_page.get_descendants()
```

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# 3. Locate what was deleted

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```python
from django.contrib.admin.utils import NestedObjects

collector = NestedObjects()
collector.collect(list(child_pages) + [sysadmin_page])
```

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# 4. Serialize

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```python
from django.core import serializers

class NoM2MSerializer(Serializer):
    def handle_m2m_field(self, obj, field):
        pass

def get_model_instances():
    for qs in collector.data.values():
        yield from qs

with open("deleted-models.json", "w") as f:
    NoM2MSerializer().serialize(
        get_model_instances(),
        stream=f
    )
```

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# 4a. Deserialize

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# 5. Test test test

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# 6. Showtime!

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# Conclusion