248 lines
3.9 KiB
Markdown
248 lines
3.9 KiB
Markdown
---
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title: Recovering deleted Wagtail pages and Django models
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class: text-center
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highlighter: shiki
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transition: slide-left
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mdc: true
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themeConfig:
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primary: '#fd5765'
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addons:
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- "slidev-addon-qrcode"
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---
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# Recovering [deleted]{style="color: #fd5765"} Wagtail pages and/or Django models
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### Jake Howard{style="color: #e85537;" .mt-10 }
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<ul class="list-none! text-sm [&>li]:m-0! mt-1 uppercase">
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<li>Senior Systems Engineer @ Torchbox</li>
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<li>Core Team, Security Team & Performance Working Group @ Wagtail</li>
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</ul>
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<ul class="list-none! text-sm [&>li]:m-0! mt-3">
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<li><mdi-earth /> theorangeone.net</li>
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<li><mdi-twitter /> @RealOrangeOne</li>
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<li><mdi-github /> @RealOrangeOne</li>
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<li><mdi-mastodon /> @jake@theorangeone.net</li>
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</ul>
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---
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layout: cover
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background: /intranet.png
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---
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# Setting the scene
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---
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layout: cover
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background: /site-history.png
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---
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# Site history report
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---
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layout: image
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image: /chat.png
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backgroundSize: contain
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---
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---
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layout: section
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---
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# Restoring from backups
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---
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layout: section
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---
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# _Partially_ restoring from backups
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---
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layout: section
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---
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## 1.
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# Spin up a database backup
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---
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layout: section
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---
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## 2.
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# Locate the page models
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<div class="pt-5">
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```python
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from wagtail.models import Page
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sysadmin_page = Page.objects.get(id=91)
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child_pages = sysadmin_page.get_descendants()
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```
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</div>
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<style>
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pre.shiki {
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font-size: 1.4rem !important;
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text-align: left;
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}
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</style>
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---
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layout: section
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---
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## 3.
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# Locate what was deleted
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<div class="pt-5">
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```python
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from django.contrib.admin.utils import NestedObjects
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collector = NestedObjects()
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collector.collect(list(child_pages) + [sysadmin_page])
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```
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</div>
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<style>
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pre.shiki {
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font-size: 1.4rem !important;
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text-align: left;
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}
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</style>
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---
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layout: section
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---
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# 4. Serialize
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<div class="pt-5">
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```python {all|3-5|all}
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from django.core import serializers
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class NoM2MSerializer(Serializer):
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def handle_m2m_field(self, obj, field):
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pass
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def get_model_instances():
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for qs in collector.data.values():
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yield from qs
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with open("deleted-models.json", "w") as f:
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NoM2MSerializer().serialize(
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get_model_instances(),
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stream=f
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)
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```
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</div>
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<style>
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pre.shiki {
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font-size: 1rem !important;
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text-align: left;
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}
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</style>
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---
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layout: section
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---
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## 4a.
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# [De]{.italic}serialize
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### `manage.py loaddata`
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---
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layout: center
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---
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# `restore-deleted-pages.py`
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```python {all}{lines:true}
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from django.contrib.admin.utils import NestedObjects
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from django.core import serializers
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from wagtail.models import Page
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class NoM2MSerializer(Serializer):
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def handle_m2m_field(self, obj, field):
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pass
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sysadmin_page = Page.objects.get(id=91)
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child_pages = sysadmin_page.get_descendants()
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collector = NestedObjects()
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collector.collect(list(child_pages) + [sysadmin_page])
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def get_model_instances():
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for qs in collector.data.values():
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yield from qs
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with open("deleted-models.json", "w") as f:
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NoM2MSerializer().serialize(
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get_model_instances(),
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stream=f
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)
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```
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---
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layout: fact
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---
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### 5.
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# **Test!**
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---
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layout: image-right
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image: /red-button.png
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class: flex justify-center flex-col items-center
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---
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### 6.
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# Showtime!
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---
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layout: image-right
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image: https://images.unsplash.com/photo-1622021134395-d26aab83c221?q=80&w=1470&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D
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class: flex justify-center flex-col text-xl
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---
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1. Backup!
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2. Transfer `deleted-models.json` to server
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3. `loaddata`
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4. `checktree`
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5. `update_index`
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6. `rebuild_reference_index`
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---
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layout: cover
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background: /sysadmin.png
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---
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# Conclusion
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---
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layout: end
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---
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END
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<div class="absolute right-20 bottom-1/2 translate-y-1/2">
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<QRCode
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:width="170"
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:height="170"
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data="https://wagtail.org/blog/recovering-deleted-pages-and-models/"
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:dotsOptions="{ color: 'white' }"
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/>
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</div>
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