Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Django Migrations: A Retrospective
Search
Sponsored
·
SiteGround - Reliable hosting with speed, security, and support you can count on.
→
Andrew Godwin
August 01, 2014
Programming
2
320
Django Migrations: A Retrospective
A talk I gave at DjangoCon AU 2014.
Andrew Godwin
August 01, 2014
Tweet
Share
More Decks by Andrew Godwin
See All by Andrew Godwin
Reconciling Everything
andrewgodwin
1
360
Django Through The Years
andrewgodwin
0
280
Writing Maintainable Software At Scale
andrewgodwin
0
490
A Newcomer's Guide To Airflow's Architecture
andrewgodwin
0
390
Async, Python, and the Future
andrewgodwin
2
710
How To Break Django: With Async
andrewgodwin
1
770
Taking Django's ORM Async
andrewgodwin
0
770
The Long Road To Asynchrony
andrewgodwin
0
740
The Scientist & The Engineer
andrewgodwin
1
810
Other Decks in Programming
See All in Programming
フロントエンド開発の勘所 -複数事業を経験して見えた判断軸の違い-
heimusu
7
2.8k
責任感のあるCloudWatchアラームを設計しよう
akihisaikeda
3
180
「ブロックテーマでは再現できない」は本当か?
inc2734
0
1k
AIによる高速開発をどう制御するか? ガードレール設置で開発速度と品質を両立させたチームの事例
tonkotsuboy_com
7
2.4k
Honoを使ったリモートMCPサーバでAIツールとの連携を加速させる!
tosuri13
1
180
Vibe Coding - AI 驅動的軟體開發
mickyp100
0
180
16年目のピクシブ百科事典を支える最新の技術基盤 / The Modern Tech Stack Powering Pixiv Encyclopedia in its 16th Year
ahuglajbclajep
5
1k
Oxlintはいいぞ
yug1224
5
1.3k
コマンドとリード間の連携に対する脅威分析フレームワーク
pandayumi
1
460
プロダクトオーナーから見たSOC2 _SOC2ゆるミートアップ#2
kekekenta
0
220
今から始めるClaude Code超入門
448jp
8
8.9k
HTTPプロトコル正しく理解していますか? 〜かわいい猫と共に学ぼう。ฅ^•ω•^ฅ ニャ〜
hekuchan
2
690
Featured
See All Featured
Building Adaptive Systems
keathley
44
2.9k
How to Get Subject Matter Experts Bought In and Actively Contributing to SEO & PR Initiatives.
livdayseo
0
67
A designer walks into a library…
pauljervisheath
210
24k
16th Malabo Montpellier Forum Presentation
akademiya2063
PRO
0
51
Keith and Marios Guide to Fast Websites
keithpitt
413
23k
The Director’s Chair: Orchestrating AI for Truly Effective Learning
tmiket
1
97
Designing for Performance
lara
610
70k
My Coaching Mixtape
mlcsv
0
48
The SEO identity crisis: Don't let AI make you average
varn
0
290
Claude Code どこまでも/ Claude Code Everywhere
nwiizo
61
52k
A better future with KSS
kneath
240
18k
Making Projects Easy
brettharned
120
6.6k
Transcript
Andrew Godwin @andrewgodwin migrations: a retrospective
Andrew Godwin Author of South migrations library Hi, I'm Author
of 1.7 Django migrations I like my tea iced, and my schemas explicit
Django/Python backend I work for Discovery? Mobile? Storage? UI? On-site?
...auditing? We have it all. We're hiring!
Migrations They're pretty good.
South ...it was good for its time
The Initial Plan Django Schema backend ORM Hooks South 2
Migration handling User interface
The Revised Plan Django Schema backend ORM Hooks South 2
Migration handling User interface Backport for 1.4 - 1.6
The Revised Revised Plan Django Schema backend ORM Hooks Migration
handling User interface
Logically Separate SchemaEditor Schema Migrations field.deconstruct() ModelOptions.apps Operations Loader /
Graph Executor Autodetector Optimiser State
makemigrations field.deconstruct() Loader / Graph Autodetector Optimiser State Writer 1
2 State 3 5 4
migrate SchemaEditor ModelOptions.apps Operations Loader / Graph Executor State 1
2 Recorder 3
Moving South into Django instead, "Adding migrations to Django"
A New Format More concise Declarative Introspectable
Migration actions Frozen ORM
None
In-memory running Creates models from migration sets Autodetector diffs created
from on-disk Used to feed SchemaEditor / ORM
But what went wrong?
Swappable Models
Your migration dependencies myapp/0001 myapp/0002 otherapp/0001 auth/0001 contenttypes/0001
myapp/0001 myapp/0002 otherapp/0001 auth/0001 contenttypes/0001 thirdapp/0001 Your migration dependencies on
swappable models
what? Your migration dependencies on swappable models myapp/0001 myapp/0002 otherapp/0001
auth/0001 contenttypes/0001 thirdapp/0001 ???
what? Your migration dependencies on swappable models myapp/0001 myapp/0002 otherapp/0001
auth/0001 contenttypes/0001 thirdapp/0001 ???
Unmigrated Apps
Test persistence
Test persistence on MySQL
Random Meta options order_with_respect_to? Really?
Proxy Models
But we're close! Django 1.7, coming to a server near
you soon.
Thanks! Andrew Godwin
[email protected]