recovering-deleted-wagtail-pages/slides.md

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Recovering deleted Wagtail pages and Django models	text-center	shiki	slide-left	true	primary #fd5765

Recovering [deleted]{style="color: #fd5765"} Wagtail pages and/or Django models

Jake Howard

• Senior Systems Engineer @ Torchbox
• Core Team, Security Team & Performance Working Group @ Wagtail

• theorangeone.net
• @RealOrangeOne
• @RealOrangeOne
• @jake@theorangeone.net

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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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Partially restoring from backups

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1.

Spin up a database backup

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2.

Locate the page models

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

from django.contrib.admin.utils import NestedObjects

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

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4. Serialize

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.

[De]{.italic}serialize

manage.py loaddata

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restore-deleted-pages.py

from django.contrib.admin.utils import NestedObjects
from django.core import serializers

from wagtail.models import Page

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

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

child_pages = sysadmin_page.get_descendants()

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

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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5.

Test!

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6.

Showtime!

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1. Backup!
2. Transfer deleted-models.json to server
3. loaddata
4. checktree
5. update_index
6. rebuild_reference_index

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Conclusion

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END