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Elixir and Ecto
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Patrick Van Stee
October 03, 2013
Technology
5
910
Elixir and Ecto
Patrick Van Stee
October 03, 2013
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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
?