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
Elixir and Ecto
Search
Patrick Van Stee
October 03, 2013
Technology
5
780
Elixir and Ecto
Patrick Van Stee
October 03, 2013
Tweet
Share
More Decks by Patrick Van Stee
See All by Patrick Van Stee
Raft: Consensus for Rubyists
vanstee
134
6.5k
Bootstrap
vanstee
8
690
HTTP API Design for iOS Applications
vanstee
11
520
Consensus: An Introduction to Raft
vanstee
22
2.7k
Convergent Replicated Data Types
vanstee
4
640
Pour Over Brewing Method
vanstee
1
270
Celluloid & DCell
vanstee
4
440
Map Reduce & Ruby
vanstee
10
660
Other Decks in Technology
See All in Technology
VPoEの視点から見た、ヘンリーがサーバーサイドKotlinを使う理由 / Why Server-side Kotlin 2024
cho0o0
1
420
データ分析を支える技術 生成AI再入門
ishikawa_satoru
0
380
CTOから見た事業開発とプロダクト開発 / My Perspective on Business and Product Development as CTO
keisuke69
4
960
[NIKKEI Tech Talk]Bias for Action!! 実践から学ぶための仕組とコミュニティ / Community for Practice and Learning
kanamasa
0
270
スレットハンティングについて知っておきたいこと
hacket
0
130
ギークの理想が7つ集まるエムスリーで夢を叶えよう - エムスリー株式会社
m3_engineering
1
260
公共領域から学ぶ クラウド移行についてエンジニアが意識していること
kawakawa2222
0
140
DevIO2024_レガシー運用からの脱却 -クラウド活用の実践事例とベストプラクティス-
jun2882
0
210
エンジニアリングマネージャーはどう学んでいくのか #devsumi / How Do Engineering Managers Continue to Learn and Grow?
expajp
4
1.3k
[2024最新版]AWS Control Towerを使ったセキュアなマルチアカウント環境の作り方
hiashisan
0
270
成長期に歩みを止めないための創業期の開発文化形成
mayah
6
420
大規模ドラレコデータ収集・機械学習基盤を支える AWS CDK 〜導入・運用事例紹介〜
pemugi
0
110
Featured
See All Featured
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
12
3.8k
Adopting Sorbet at Scale
ufuk
71
8.8k
Fantastic passwords and where to find them - at NoRuKo
philnash
42
2.7k
Web development in the modern age
philhawksworth
203
10k
How to train your dragon (web standard)
notwaldorf
79
5.5k
GitHub's CSS Performance
jonrohan
1026
450k
We Have a Design System, Now What?
morganepeng
46
7k
Keith and Marios Guide to Fast Websites
keithpitt
408
22k
Become a Pro
speakerdeck
PRO
15
4.8k
Designing the Hi-DPI Web
ddemaree
276
34k
Happy Clients
brianwarren
94
6.5k
What’s in a name? Adding method to the madness
productmarketing
PRO
21
2.9k
Transcript
elixir atlanta meetup
meetup.com/ atlantaelixir @vanstee
None
• speakers • sponsors • twitter • website • github
org • [your great idea]
elixir and ecto
Elixir is a functional, meta-programming aware language built on top
of the Erlang VM.
elixir-lang/elixir @josevalim
defmodule Hello do IO.puts "Before world defined" def world do
IO.puts "Hello World" end IO.puts "After world defined" end Hello.world HELLO.EX
None
Types
# tuple { :a, :b, :c } # list [1,
2, 3] [a: 1, b: 2, c: 3] # record defrecord User, name: "", age: nil User.new(name: "Patrick", age: 25) TYPE.EX
Pattern Matching
# assignment a = 1 # => 1 # matching
1 = a # => 1 2 = a # => ** (MatchError) ... { ^a, b } = { 1, 2 } # b => 2 [head | _] = [1, 2, 3] # head => 1 PATTERN.EX
case { 1, 2, 3 } do { 4, 5,
6 } -> "This won't match" { 1, x, 3 } when x > 0 -> "This will match and assign x" _ -> "No match" end GUARD.EX
Processes
current_pid = self spawn fn -> current_pid <- :hello end
receive do :hello -> IO.puts "Hello World" end PROCESS.EX
defmodule Stacker.Supervisor do use Supervisor.Behaviour def start_link(stack) do :supervisor.start_link(__MODULE__, stack)
end def init(stack) do children = [worker(Stacker.Server, [stack])] supervise children, strategy: :one_for_one end end SUPERVISOR.EX
Protocols Macros DocTest and lots more
elixir-lang.org #elixir-lang
None
None
ecto database query DSL
elixir-lang/ecto @ericmj
defmodule User do use Ecto.Model queryable "user" do field :name,
:string end end MODEL.EX
defmodule FindUser do import Ecto.Query def find_by_name(name) do query =
from u in User, where: u.name == ^name, limit: 1 Repo.all(query) end end QUERY.EX
None
Repo
• wrapper • holds connections • executes queries • supervised
worker
defmodule Repo do use Ecto.Repo, adapter: Ecto.Adapters.Postgres def url do
"ecto://user:pass@localhost/db" end end Repo.all(...) Repo.create(...) Repo.update(...) Repo.delete(...) REPO.EX
Entity
• fields • associations • elixir record
defmodule User do use Ecto.Model queryable "user" do field :name,
:string field :password, :string, default: "secret" has_many :projects, Project end end MODEL.EX
Query
• relational algebra • extendable • macros • keyword lists
def paginate(query, page, size) do extend query, limit: size, offset:
(page - 1) * size end query = FindUser.find_by_state("GA") query |> paginate(1, 50) |> Repo.all PAGINATE.EX
from u in User, where: u.name == ^name, limit: 1
QUERY.EX
from(u in User) |> where([u], u.name == ^name) |> limit(1)
|> select([u], u) QUERY.EX
select( limit( where( from(u in User), [u], u.name == ^name
), 1 ), [u], u ) QUERY.EX
Gotchas
• error messages • validations • callbacks • type conversions
• SQL migrations • missing mix tasks
elixir-lang/ecto examples/simple
Thanks! @josevalim @ericmj #elixir-lang
?