Elixir and Phoenix

Building a basic CRUD application with Elixir and Phoenix.

Transcript

1. Elixir&<3&Phoenix @gogogarre'
2. Disclaimer I'm$a$Elixir$noob.
3. A"quick"tail"of"my"Elixir"adventure. 3"easy"steps"to"popularity.
4. 1"#"Write"a"blog
5. 2"#"Post"it"everywhere
6. 3"#"Profit
8. 3rd$place
9. 1st$place!
13. The$glory$days$are$over..
14. Programming)in)Elixir)with)Phoenix) Framework Building(a(basic(CRUD(app
15. Who$am$I? • ruby&dev&by&day • dancer&by&night • drinking&enthusiasts&always • recently&elixir&dev
16. Elixir&is&ballin' • func&onal*programming*rocks*bro • concurrency*rocks,*concurrency*rocks,*concurrency*rocks • pa6ern*matching*is*awesome
17. Phoenix(is(ballin' • NOT%rails,%but%has%some%rails%convenience • Rails%like. • Familiar
18. Installing)Phoenix $ mix phoenix.new phoenix_crud ~/code/phoenix_crud $ mix do deps.get, compile $ mix phoenix.start
19. What%do%we%get?
20. What%do%we%get?
21. Se#ng&up&the&Database file:!mix.exs def application do [ mod: { PhoenixCrud, [] }, applications: [:phoenix, :cowboy, :postgrex, :ecto] ] end defp deps do [ {:phoenix, github: "phoenixframework/phoenix"}, {:cowboy, "~> 1.0.0"}, {:postgrex, ">= 0.0.0"}, {:ecto, "~> 0.2.0"} ] end
22. Se#ng&up&the&Database file:!lib/phoenix_crud/repo.ex defmodule Repo do use Ecto.Repo, adapter: Ecto.Adapters.Postgres def conf do parse_url "ecto://postgres:postgres@localhost/phoenix_crud" end def priv do app_dir(:phoenix_crud, "priv/repo") end end
23. Se#ng&up&the&Database file:!lib/phoenix_crud/ supervisor.ex defmodule PhoenixCrud.Supervisor do use Supervisor def start_link do :supervisor.start_link(__MODULE__, []) end def init([]) do # Adding repo to be sent into supervise tree = [worker(Repo, [])] supervise(tree, strategy: :one_for_one) end end
24. Crea%ng(a(Migra%on $ mix ecto.gen.migration Repo create_users
25. Crea%ng(a(Migra%on file:!lib/phoenix_crud/repo/ migrations/ 20140815053139_create_users.exs defmodule PhoenixCrud.Repo.Migrations.CreateUsers do use Ecto.Migration def up do "CREATE TABLE users(id serial primary key, content varchar(140))" end def down do "DROP TABLE users" end end
26. Run$that$fancy$migra/on $ mix ecto.migrate Repo
27. Adding&a&simple&Welcome&Page file:!web/router.ex defmodule PhoenixCrud.Router do use Phoenix.Router plug Plug.Static, at: "/static", from: :phoenix_crud scope alias: PhoenixCrud do get "/", WelcomeController, :index, as: :root end end
28. Adding&a&simple&Welcome&Page file:!web/controllers/ welcome_controller.ex defmodule PhoenixCrud.WelcomeController do use Phoenix.Controller def index(conn, _params) do render conn, "index" end end
29. Adding&a&simple&Welcome&Page file:!web/views/welcome_view.ex defmodule PhoenixCrud.WelcomeView do use PhoenixCrud.Views end
30. Adding&a&simple&Welcome&Page file:!web/templates/index.eex <div class="jumbotron"> <h2>Simple CRUD app using Phoenix and Elixir!</h2> <p class="lead">First try at getting a basic crud app up and working with Phoenix.</p> </div>
31. Let's&make&that&CRUD
32. Add#the#User#Resource file:!web/router.ex defmodule PhoenixCrud.Router do use Phoenix.Router plug Plug.Static, at: "/static", from: :phoenix_crud scope alias: PhoenixCrud do get "/", WelcomeController, :index, as: :root resources "users", UserController end end
33. Add#the#User#Resource
34. Bus$ng'out'the'User'Model file:!web/router.ex defmodule PhoenixCrud.User do use Ecto.Model validate user, content: present() schema "users" do field :content, :string end end
35. Stru%ng(our(stuff user = %User{content: "Hello"} user.content #=> "Hello" Repo.insert(user) # Saves to the database user = Repo.get(User, 1) #=> %User{content: "Hello} user = %{user | content: "Goodbye"} Repo.update(user) #=> %User{content: "Goodbye"} Repo.delete(user) # Deleted the database record
36. User%Controller file:!web/controllers/ user_controller.ex defmodule PhoenixCrud.UserController do use Phoenix.Controller use Jazz alias PhoenixCrud.Router alias PhoenixCrud.User def index(conn, _params) do render conn, "index", users: Repo.all(User) end end
37. User%Controller file:!web/controllers/ user_controller.ex def show(conn, %{"id" => id}) do case Repo.get(User, id) do user when is_map(user) -> render conn, "show", user: user _ -> redirect conn, Router.page_path(page: "unauthorized") end end
38. User%Controller file:!web/controllers/ user_controller.ex def new(conn, _params) do render conn, "new" end
39. User%Controller file:!web/controllers/ user_controller.ex def create(conn, %{"user" => %{"content" => content}}) do user = %User{content: content} case User.validate(user) do [] -> user = Repo.insert(user) render conn, "show", user: user errors -> render conn, "new", user: user, errors: errors end end
40. User%Controller file:!web/controllers/ user_controller.ex def edit(conn, %{"id" => id}) do case Repo.get(User, id) do user when is_map(user) -> render conn, "edit", user: user _ -> redirect conn, Router.page_path(page: "unauthorized") end end
41. User%Controller file:!web/controllers/ user_controller.ex def update(conn, %{"id" => id, "user" => params}) do user = Repo.get(User, id) user = %{user | content: params["content"]} case User.validate(user) do [] -> Repo.update(user) # don't do this json conn, 201, JSON.encode!(%{location: Router.user_path(id: user.id)}) errors -> json conn, errors: errors end end
42. User%Controller file:!web/controllers/ user_controller.ex def destroy(conn, %{"id" => id}) do user = Repo.get(User, id) case user do user when is_map(user) -> Repo.delete(user) json conn, 200, JSON.encode!(%{location: Router.users_path}) _ -> redirect conn, Router.page_path(page: "unauthorized") end end
43. That's'all'folks
44. Thanks github:(gogogarre-/phoenix_crud twi$er:(@gogogarre$