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
South New and Old
Search
Andrew Godwin
May 25, 2010
Programming
0
170
South New and Old
A talk I gave at DjangoCon Europe 2010
Andrew Godwin
May 25, 2010
Tweet
Share
More Decks by Andrew Godwin
See All by Andrew Godwin
Reconciling Everything
andrewgodwin
1
310
Django Through The Years
andrewgodwin
0
200
Writing Maintainable Software At Scale
andrewgodwin
0
440
A Newcomer's Guide To Airflow's Architecture
andrewgodwin
0
350
Async, Python, and the Future
andrewgodwin
2
660
How To Break Django: With Async
andrewgodwin
1
730
Taking Django's ORM Async
andrewgodwin
0
720
The Long Road To Asynchrony
andrewgodwin
0
660
The Scientist & The Engineer
andrewgodwin
1
760
Other Decks in Programming
See All in Programming
AIともっと楽するE2Eテスト
myohei
9
3.1k
リバースエンジニアリング新時代へ! GhidraとClaude DesktopをMCPで繋ぐ/findy202507
tkmru
4
1.1k
Yes, You Can Work on Rails & any other Gem
kaspth
0
110
副作用と戦う PHP リファクタリング ─ ドメインイベントでビジネスロジックを解きほぐす
kajitack
2
320
AWS Summit Japan 2024と2025の比較/はじめてのKiro、今あなたは岐路に立つ
satoshi256kbyte
1
200
The Modern View Layer Rails Deserves: A Vision For 2025 And Beyond @ RailsConf 2025, Philadelphia, PA
marcoroth
2
750
新メンバーも今日から大活躍!SREが支えるスケールし続ける組織のオンボーディング
honmarkhunt
5
9k
可変変数との向き合い方 $$変数名が踊り出す$$ / php conference Variable variables
gunji
0
200
PHPカンファレンス関西2025 基調講演
sugimotokei
5
830
GPUを計算資源として使おう!
primenumber
1
280
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
2
12k
マッチングアプリにおけるフリックUIで苦労したこと
yuheiito
0
220
Featured
See All Featured
Unsuck your backbone
ammeep
671
58k
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
Balancing Empowerment & Direction
lara
1
480
Optimizing for Happiness
mojombo
379
70k
Building an army of robots
kneath
306
45k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
21k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
Practical Orchestrator
shlominoach
189
11k
4 Signs Your Business is Dying
shpigford
184
22k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Automating Front-end Workflow
addyosmani
1370
200k
Transcript
new and old south Andrew Godwin djangocon.eu 2010
It's been almost 2 years. Lots has happened.
Migrations? Eh? A bit like a VCS, but for database
schemas.
The Beginning
1-make_tables.sql 2-add_profile.sql
YOU ARE AT VERSION 2 1-make_tables.sql 2-add_profile.sql
1-make_tables.sql 2-add_profile.sql 3-remove_pony.sql 1-make_tables.sql 2-add_profile.sql 4-add_postcode.sql
1-make_tables.sql 2-add_profile.sql 3-remove_pony.sql 1-make_tables.sql 2-add_profile.sql 4-add_postcode.sql YOU ARE AT VERSION
3 YOU ARE AT VERSION 4
1-make_tables.sql 2-add_profile.sql 3-remove_pony.sql 1-make_tables.sql 2-add_profile.sql 4-add_postcode.sql YOU ARE AT VERSION
3 YOU ARE AT VERSION 4 3-remove_pony.sql 4-add_postcode.sql
Oracle MySQL PostgreSQL MSSQL SQLite
The Early Days
Adding tables Deleting tables Everything else useful
3-remove_pony.sql 1-make_tables.sql 2-add_profile.sql 4-add_postcode.sql
Uh-oh, publicity
Closing this, as it's unlikely we'll write a model history
tracker in the near future, and django-evolution does this well - no need to reinvent the wheel in that area. “ “
Feature Creep (of the good sort)
start_field_re = re.compile(r'\s*%s\s*=\s*(.*)' % field.name) for line in source[0]: #
if the field was found during a previous iteration, # we're here because the field spans across multiple lines # append the current line and try again
cms.0001_initial cms.0002_auto_start picture.0001_initial file.0001_initial flash.0001_initial link.0001_initial snippet.0001_initial video.0001_initial twitter.0001_initial cms.0003_remove_placeholder
cms.0004_textobjects cms.0005_mptt_added_to_plugins cms.0006_apphook text.0001_initial cms.0007_apphook_longer cms.0008_redirects cms.0009_added_meta_fields cms.0010_5char_language cms.0011_title_overwrites cms.0012_publisher cms.0013_site_copy file.0003_publisher text.0003_publisher picture.0004_publisher googlemap.0001_initial link.0005_publisher flash.0003_publisher snippet.0002_publisher cms.0014_sites_removed cms.0015_modified_by_added cms.0016_author_copy cms.0017_author_removed cms.0018_site_permissions cms.0019_public_table_renames file.0004_table_rename cms.0020_advanced_permissions picture.0006_float_added teaser.0001_initial text.0004_table_rename flash.0004_table_rename link.0006_table_rename snippet.0003_table_rename googlemap.0002_table_rename picture.0005_table_rename cms.0021_publisher2 picture.0007_publisher2 cms.0022_login_required_added teaser.0002_publisher2 cms.0023_plugin_table_naming_function_changed text.0002_freeze text.0005_publisher2 picture.0002_link_rename picture.0003_freeze picture.0008_longdesc_added file.0002_freeze file.0005_publisher2 flash.0002_freeze flash.0005_publisher2 link.0002_link_rename link.0003_page_link link.0004_larger_link_names link.0007_publisher2 link.0008_mailto snippet.0004_publisher2 snippet.0005_template_added googlemap.0006_publisher2 googlemap.0007_latlng googlemap.0008_routeplaner googlemap.0009_routeplaner_title video.0002_color_mute_controller video.0003_newplayer_step1 video.0004_newplayer_step2 video.0005_newplayer_step3 video.0006_newplayer_step4 video.0007_newplayer_step5 inherit.0001_initial inherit.0002_fieldchanges
Model Freezing
Historical ORM access Automatic change detection ‘Improved’ model parsing
Sanity Dawns
Introspection Magically supports custom fields Prevents hideous migration failure
SQLite Make new table Copy data from old table Delete
old table Rename new table
Signals Speed Simplicity
1.0
MultiDB? Non-relational? Renames!
Organic Growth But it's still cleanly separated
Database Backend Dependency/ Ordering Engine Migration Runner Auto- detector
The Future
Database Backend Dependency/ Ordering Engine South in future ??? Migration
Runner Auto- detector
The Ultimate Goal
Andrew Godwin Fin. www.aeracode.org @andrewgodwin
Andrew Godwin Fin. www.aeracode.org @andrewgodwin