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
940
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
140
7.1k
Bootstrap
vanstee
8
790
HTTP API Design for iOS Applications
vanstee
11
640
Consensus: An Introduction to Raft
vanstee
22
3k
Convergent Replicated Data Types
vanstee
4
770
Pour Over Brewing Method
vanstee
1
360
Celluloid & DCell
vanstee
4
550
Map Reduce & Ruby
vanstee
10
810
Other Decks in Technology
See All in Technology
Function Body Macros で、SwiftUI の View に Accessibility Identifier を自動付与する/Function Body Macros: Autogenerate accessibility identifiers for SwiftUI Views
miichan
2
170
現場で効くClaude Code ─ 最新動向と企業導入
takaakikakei
1
110
AIのグローバルトレンド2025 #scrummikawa / global ai trend
kyonmm
PRO
1
240
開発者を支える Internal Developer Portal のイマとコレカラ / To-day and To-morrow of Internal Developer Portals: Supporting Developers
aoto
PRO
1
360
役割は変わっても、変わらないもの 〜スクラムマスターからEMへの転身で学んだ信頼構築の本質〜 / How to build trust
shinop
0
160
カミナシ社の『ID管理基盤』製品内製 - その意思決定背景と2年間の進化 #AWSUnicornDay / Kaminashi ID - The Big Whys
kaminashi
3
810
AWSで推進するデータマネジメント
kawanago
0
1.1k
異業種出身エンジニアが気づいた、転向して十数年経っても変わらない自分の武器とは
macnekoayu
0
290
BPaaSにおける人と協働する前提のAIエージェント-AWS登壇資料
kentarofujii
0
120
20250903_1つのAWSアカウントに複数システムがある環境におけるアクセス制御をABACで実現.pdf
yhana
2
350
Bye-Bye Query Spaghetti: Write Queries You'll Actually Understand Using Pipelined SQL Syntax
tobiaslampertlotum
0
140
シークレット管理だけじゃない!HashiCorp Vault でデータ暗号化をしよう / Beyond Secret Management! Let's Encrypt Data with HashiCorp Vault
nnstt1
3
220
Featured
See All Featured
Gamification - CAS2011
davidbonilla
81
5.4k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
111
20k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.6k
How to Ace a Technical Interview
jacobian
279
23k
The Language of Interfaces
destraynor
161
25k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.5k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
800
Imperfection Machines: The Place of Print at Facebook
scottboms
268
13k
Scaling GitHub
holman
463
140k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Six Lessons from altMBA
skipperchong
28
4k
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
?