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
910
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
137
6.9k
Bootstrap
vanstee
8
770
HTTP API Design for iOS Applications
vanstee
11
610
Consensus: An Introduction to Raft
vanstee
22
2.9k
Convergent Replicated Data Types
vanstee
4
730
Pour Over Brewing Method
vanstee
1
330
Celluloid & DCell
vanstee
4
530
Map Reduce & Ruby
vanstee
10
770
Other Decks in Technology
See All in Technology
より良い開発者体験を実現するために~開発初心者が感じた生成AIの可能性~
masakiokuda
0
200
クラウド開発環境Cloud Workstationsの紹介
yunosukey
0
180
Amazon CloudWatch Application Signals ではじめるバーンレートアラーム / Burn rate alarm with Amazon CloudWatch Application Signals
ymotongpoo
5
520
AWS全冠芸人が見た世界 ~資格取得より大切なこと~
masakiokuda
5
6.1k
Dynamic Reteaming And Self Organization
miholovesq
3
510
SDカードフォレンジック
su3158
1
620
サーバレス、コンテナ、データベース特化型機能をご紹介。CloudWatch をもっと使いこなそう!
o11yfes2023
0
180
watsonx.data上のベクトル・データベース Milvusを見てみよう/20250418-milvus-dojo
mayumihirano
0
120
“パスワードレス認証への道" ユーザー認証の変遷とパスキーの関係
ritou
1
600
AWSLambdaMCPServerを使ってツールとMCPサーバを分離する
tkikuchi
1
3k
Devinで模索する AIファースト開発〜ゼロベースから始めるDevOpsの進化〜
potix2
PRO
7
3.4k
JPOUG Tech Talk #12 UNDO Tablespace Reintroduction
nori_shinoda
2
140
Featured
See All Featured
Visualization
eitanlees
146
16k
Git: the NoSQL Database
bkeepers
PRO
430
65k
Into the Great Unknown - MozCon
thekraken
37
1.7k
How to Think Like a Performance Engineer
csswizardry
23
1.5k
How to train your dragon (web standard)
notwaldorf
90
6k
Adopting Sorbet at Scale
ufuk
76
9.3k
Building Adaptive Systems
keathley
41
2.5k
Navigating Team Friction
lara
184
15k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
29
9.4k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
8
660
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
32
5.4k
Music & Morning Musume
bryan
47
6.5k
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
?