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
On The Look-out For Your Data (DjangoCon Europe...
Search
Markus H
May 24, 2018
Technology
0
13k
On The Look-out For Your Data (DjangoCon Europe 2018)
My talk from DjangoCon Europe 2018
Markus H
May 24, 2018
Tweet
Share
More Decks by Markus H
See All by Markus H
🐍 ❤️ 🦀 — Python loves Rust
markush
0
200
Knock! Knock! Who's There?
markush
0
60
An Introduction To Kubernetes ☸
markush
0
78
Writing Safe Database Migrations (DjangoCon Europe 2021)
markush
0
14k
A Pony On The Move: How Migrations Work In Django 🐎
markush
0
13k
All Hands on Deck — Handling Security Issues
markush
0
13k
Logging Rethought 2: The Actions of Frank Taylor Jr. (PyCon UK 2019)
markush
0
50
Logging Rethought 2: The Actions of Frank Taylor Jr. (PyCon Australia 2019)
markush
1
190
Logging Rethought 2: The Actions of Frank Taylor Jr. (DjangoCon Europe 2019)
markush
0
13k
Other Decks in Technology
See All in Technology
OpenID Connect for Identity Assurance の概要と翻訳版のご紹介 / 20250219-BizDay17-OIDC4IDA-Intro
oidfj
0
430
AIエージェント元年
shukob
0
120
Developers Summit 2025 浅野卓也(13-B-7 LegalOn Technologies)
legalontechnologies
PRO
1
1.4k
「正しく」失敗できる チームの作り方 〜リアルな事例から紐解く失敗を恐れない組織とは〜 / A team that can fail correctly
i35_267
1
560
Raycast AI APIを使ってちょっと便利な拡張機能を作ってみた / created-a-handy-extension-using-the-raycast-ai-api
kawamataryo
0
160
Active Directory攻防
cryptopeg
PRO
7
4.6k
コンピュータビジョンの社会実装について考えていたらゲームを作っていた話
takmin
1
500
CDKのコードを書く環境を作りました with Amazon Q
nobuhitomorioka
1
120
TAMとre:Capセキュリティ編 〜拡張脅威検出デモを添えて〜
fujiihda
2
370
Helm , Kustomize に代わる !? 次世代 k8s パッケージマネージャー Glasskube 入門 / glasskube-entry
parupappa2929
0
270
NFV基盤のOpenStack更新 ~9世代バージョンアップへの挑戦~
vtj
0
290
エンジニアリング価値を黒字化する バリューベース戦略を用いた 技術戦略策定の道のり
kzkmaeda
2
190
Featured
See All Featured
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Adopting Sorbet at Scale
ufuk
74
9.2k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.7k
Measuring & Analyzing Core Web Vitals
bluesmoon
6
250
The World Runs on Bad Software
bkeepers
PRO
67
11k
StorybookのUI Testing Handbookを読んだ
zakiyama
28
5.5k
A Tale of Four Properties
chriscoyier
158
23k
Fireside Chat
paigeccino
34
3.2k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
49
2.3k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
27
1.9k
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.6k
Transcript
On The Look-Out For Your Data @m_holtermann #djangocon Europe 2018
I’m Markus Holtermann @m_holtermann • github.com/MarkusH • markusholtermann.eu @laterpay •
laterpay.net • Django Contributor • Software Engineer at
What Is Search?
How To Search In Django?
What Is Search?
What Is Search? Try to find something by looking or
otherwise seeking carefully and thoroughly. — Oxford English Dictionary
What Is Search? Try to find something by looking or
otherwise seeking carefully and thoroughly. — Oxford English Dictionary
What Is Search? Try to find something by looking or
otherwise seeking carefully and thoroughly. — Oxford English Dictionary
Search Is Hard
Searching In Django?
from django.shortcuts import get_object_or_404, render from blog.models import Article def
article_view(request, pk): article = get_object_or_404(Article, pk=pk) return render( request, 'article.html', context={'article': article}, )
Searching Text
from django.shortcuts import get_list_or_404, render from blog.models import Article def
article_view(request): articles = get_list_or_404( Article, text__icontains=request.GET.get('query', ''), ) return render( request, 'articles.html', context={'articles': articles}, )
SELECT * FROM blog_article WHERE text ILIKE '%Looking for text%'
Trigrams
-- As superuser # CREATE EXTENSION pg_trgm; # SELECT show_trgm('I
love Django'); show_trgm ---------------------------------------------- - {" d", " i", " l", " dj", " i ", " lo", ang, dja, "go ", jan, lov, ngo, ove, "ve "}
from django.contrib.postgres.indexes import GistIndex class TrigramGistIndex(GistIndex): suffix = 'trgm_gist' sql
= 'CREATE INDEX %(name)s ON %(table)s %(using)s \ (UPPER(%(columns)s) gist_trgm_ops)%(extra)s' def create_sql(self, model, schema_editor, using=''): statement = super().create_sql(model, schema_editor, using=using) statement.template = self.sql return statement
Searching Text
Full-text Search
Word order doesn’t matter “Django Migrations” = “Migrations Django”
Stemming computer, compute, computation = comput
Ignoring Stopwords “Django is the best” = “Django best”
__search & PostgreSQL https://docs.djangoproject.com/en/ 2.0/ref/contrib/postgres/search/
External Search Tools
None
from django.db import models, transaction class Article(models.Model): # ... def
save(self, *args, **kwargs): with transaction.atomic(): transaction.on_commit( lambda: update_search(self.pk)) super().save(*args, **kwargs)
from django.db import models, transaction class Article(models.Model): # ... def
delete(self, *args, **kwargs): pk = self.pk with transaction.atomic(): transaction.on_commit( lambda: delete_search(pk)) return super().delete( *args, **kwargs)
Maintain A Complete Search Index
What Is Search? Try to find something by looking or
otherwise seeking carefully and thoroughly. — Oxford English Dictionary
• Example: https://github.com/MarkusH/talk-django-search • Search in Django: https://docs.djangoproject.com/en/2.0/topics/db/search/ • Choosing
a PostgreSQL text search method: https://blog.2ndquadrant.com/text-search-strategies-in-postgresql/ • Trigram Extension: https://www.postgresql.org/docs/10/static/pgtrgm.html • Full-text search: https://www.postgresql.org/docs/10/static/textsearch-tables.html
Thank you! @m_holtermann
import blog.indexes from django.contrib.postgres.operations import TrigramExtension from django.db import migrations
class Migration(migrations.Migration): dependencies = [('blog', '0002_auto_20180503_1925')] operations = [ TrigramExtension(), migrations.AddIndex( model_name='entry', index=blog.indexes.TrigramGistIndex( fields=['body'], name='body_trgm_gist')), ]
-- Creates extension pg_trgm CREATE EXTENSION IF NOT EXISTS "pg_trgm";
-- Create index body_trgm_gist on field(s) -- body of model entry CREATE INDEX "body_trgm_gist" ON "blog_entry" USING gist (UPPER("body") gist_trgm_ops);