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
Introduction to GraphQL
Search
Adrián Matellanes
September 23, 2017
Programming
4
830
Introduction to GraphQL
Learn about GraphQL, how it works, and how to use it.
Adrián Matellanes
September 23, 2017
Tweet
Share
More Decks by Adrián Matellanes
See All by Adrián Matellanes
Test-Driven Development
amatellanes
2
110
Practical Monitoring
amatellanes
0
80
Making code compatible with Python 2 and 3
amatellanes
0
1.2k
Python Gotchas
amatellanes
3
1.6k
Cómo construir un API del que tus padres se sientan orgullosos
amatellanes
4
1.2k
Unicode: WTF?
amatellanes
1
930
Málaga Python Meetup
amatellanes
0
150
Other Decks in Programming
See All in Programming
Flutterでllama.cppをつかってローカルLLMを試してみた
sakuraidayo
0
140
マイコンでもRustのtestがしたい/KernelVM Kansai 11
tnishinaga
0
850
状態と共に暮らす:ステートフルへの挑戦
ypresto
3
1.2k
2025-04-25 GitHub Copilot Agent ライブデモ(スクリプト)
goataka
0
110
はじめてのPDFKit.pdf
shomakato
0
100
flutter_kaigi_mini_4.pdf
nobu74658
0
150
大LLM時代にこの先生きのこるには-ITエンジニア編
fumiyakume
8
3.3k
Road to Ruby for A Linguistics Nerd
hayat01sh1da
PRO
0
120
AIコーディングの理想と現実
tomohisa
36
39k
VitestのIn-Source Testingが便利
taro28
8
2.4k
2025年のz-index設計を考える
tak_dcxi
5
1.4k
API for docs
soutaro
4
1.7k
Featured
See All Featured
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.2k
[RailsConf 2023] Rails as a piece of cake
palkan
54
5.5k
Speed Design
sergeychernyshev
29
930
Measuring & Analyzing Core Web Vitals
bluesmoon
7
420
Adopting Sorbet at Scale
ufuk
76
9.4k
Fireside Chat
paigeccino
37
3.4k
YesSQL, Process and Tooling at Scale
rocio
172
14k
Optimizing for Happiness
mojombo
378
70k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
12k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.3k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.7k
Automating Front-end Workflow
addyosmani
1370
200k
Transcript
Introduction to GraphQL
GET https://2017.es.pycon.org/speakers/me { "name": "Adrián Matellanes", "roles": [ "Lead API
Developer", "Málaga Python Organizer" ], "worksAt": "Ebury", "twitter": "@_amatellanes", "github": "github.com/amatellanes" }
What’s GraphQL?
A programming language
A special type of database
A library
A Query Language for APIs
Why GraphQL?
Due to the nature of REST
REST Problems
GET /characters/1 { "name": "Jon Snow" }
"url": "http://anapioficeandfire.com/api/characters/583", "name": "Jon Snow", "culture": "Northmen", "born": "In 283
AC", "titles": [ "Lord Commander of the Night's Watch" ], "aliases": [ "Lord Snow", "Ned Stark's Bastard", "The Snow of Winterfell", "The Bastard of Winterfell", "Lord Crow" ], "allegiances": [ "http://anapioficeandfire.com/api/houses/362" ], "books": [ "http://anapioficeandfire.com/api/books/5" ], "povBooks": [ "http://anapioficeandfire.com/api/books/1", "http://anapioficeandfire.com/api/books/2", "http://anapioficeandfire.com/api/books/3", "http://anapioficeandfire.com/api/books/8"
Round Trip and Repeat Trip Times
None
/episodes/1
/episodes/1 /characters/345 /characters/563 /characters/802 /characters/441 /characters/674
/episodes/1 /characters/345 /characters/563 /characters/802 /characters/441 /characters/674 /reviews/3512
Over/Under Fetching
/episodes/1?fields=characters(name,playedBy)
/episode_with_all_stuff /episode_with_amazing_pictures /episode_with_stuff_i_need_today /episode_with_stuff_for_mobile_app /episode_with_actors_and_reviews_and_images /episode_with_stuff_for_mobile_app_v2 /episode_with_actors_and_reviews_but_no_images
/episode_with_all_stuff /episode_with_amazing_pictures /episode_with_stuff_i_need_today /episode_with_stuff_for_mobile_app /episode_with_stuff_for_mobile_app_v2 /episode_with_actors_and_reviews_and_images /episode_with_actors_and_reviews_but_no_images
None
https://code.facebook.com/projects/
Created July 1, 2015 Updated September 20, 2017 381 Forks
6,078 Stars 302 Commits 82 Open Issues https://github.com/facebook/graphql
None
“You will receive what you ask for no more, no
less.” - Mark Allen
None
None
None
None
None
None
None
None
None
None
None
GraphQL vs. REST
REST Model
Client /books /characters /houses Databases Services External APIs
GraphQL Model
Client Databases Services External APIs /graphql/
Anatomy of a GraphQL
{ me { name } }
{ me { name } } { "me": { "name":
"Jon Snow" } }
Scalar types
Int Float String Boolean ID Date enum
GraphQL Schema Definition Language
type Query { allCharacters: [Character]! character(id: ID!): Character }
type Query { allCharacters: [Character]! character(id: ID!): Character } Root
Type
type Query { allCharacters: [Character]! character(id: ID!): Character } Root
Fields
type Query { allCharacters: [Character]! character(id: ID!): Character } Arguments
type Query { allCharacters: [Character]! character(id: ID!): Character } Return
Types
type Character { name: String! house: House! } type House
{ name: String! words: String! members: [Character]! }
type Character { name: String! house: House! } type House
{ name: String! words: String! members: [Character]! } Object Type
type Character { name: String! house: House! } type House
{ name: String! words: String! members: [Character]! } Fields
type Character { name: String! house: House! } type House
{ name: String! words: String! members: [Character]! } Return Types
Queries for fetching data from the server
query CharactersNameAndHouse { allCharacters { name house { words }
} }
query CharactersNameAndHouse { allCharacters { name house { words }
} } Operation Type
query CharactersNameAndHouse { allCharacters { name house { words }
} } Operation Name
query CharactersNameAndHouse { allCharacters { name house { words }
} } Selection Set
query CharactersNameAndHouse { allCharacters { name house { words }
} } Fields
query CharactersNameAndHouse { allCharacters { name house { words }
} } { "data": { "allCharacters": [ { "name": "Daenerys Targaryen", "house": { "words": "Fire and Blood" } }, { "name": "Jon Snow", "house": { "words": "Winter Is Coming" } } ] } }
query { character(name: "Hodor") { name house { words }
} } Arguments
query CharacterByName($name: String!) { character(name: $name) { name } }
{ "name": "Hodor" } Variables
query { character(name: "Hodor") { ...CharacterFragment } } fragment CharacterFragment
on Character { name house { words } } Fragments
{ character(name: "Hodor") { ... on Character { name house
{ words } } } } Inline Fragments
Mutations for manipulating data and fetch the updated result
type Mutation { createCharacter(name: String!): Character }
mutation CharacterMutation { createCharacter(name: "Sansa Stark") { name } }
{ "data": { "createCharacter": { "name": "Sansa Stark" } } }
Subscriptions for real-time updates
type Subscription { newCharacter: Character! }
subscription NewCharacterSubscription { newCharacter { name } } { "data":
{ "newCharacter": { "name": "Tyrion Lannister" } } }
Query Execution
{ getHouse(id: 5) { name words members { name }
} }
name words members getHouse(id: 5) { name, words, members }
[ { name }, { name } ] name name
QUERY name words members getHouse(id: 5) { name, words, members
} [ { name }, { name } ] name name
QUERY getHouse(id: 5) { name, words, members } HOUSE name
words members [ { name }, { name } ] name name
QUERY getHouse(id: 5) { name, words, members } HOUSE name
words members [ { name }, { name } ] CHARACTER name name
Clients with Super Powers
Introspection Queries
{ "data": { "__type": { "name": "Book", "kind": "OBJECT", "fields":
[ { "name": "title", "type": { "name": "String" } } ] } } } { __type(name: "Book") { name kind fields { name type { name } } } }
None
GraphiQL
None
Graphene GraphQL framework for Python
Created September 24, 2015 Updated September 20, 2017 229 Forks
2,356 Stars 1,219 Commits 87 Open Issues https://github.com/graphql-python/graphene
None
None
"It’s important to understand that it isn’t all or nothing.
GraphQL is in our future, but it isn’t our exclusive future."
Thank you!