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