Um clone do Twitter com Phoenix e Vue.js

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Um clone do Twitter com Phoenix e Vue.js @philipsampaio

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Sobre Twitter

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Sobre Vue.js

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Sobre Phoenix

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Philip Sampaio @philipsampaio @philss

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github.com/philss/ﬂoki

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magnetis.com.br/dev

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Twitter

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Twitter

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Twitter é importante!

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Não podemos correr esse risco

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Precisamos de uma alternativa

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Será feito, aqui e agora

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Um MVP do Twitter

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MVP que eu possa twittar

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MVP que eu possa seguir

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MVP que eu possa ver tweets

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Um nome

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sabiah

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Falando em pássaros

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Poderoso

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Poderoso Herda os superpoderes da Elixir

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Produtivo

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Produtivo Geradores, guides, metaprogramação

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Produtivo Um pouco parecido com Rails

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sabiah

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sabiah ⏳ 1. tweetar 2. seguir 3. ver timeline com tweets de quem sigo

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mix phoenix.new sabiah

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web/

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lib/

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sabiah ⏳ 1. tweetar 2. seguir 3. ver timeline com tweets de quem sigo

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Uma timeline estática Tweetar

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Timeline é onde vejo novos tweets de quem sigo  (também os meus tweets)

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Começa pelo router.ex

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scope "/", Sabiah do pipe_through :browser # Use the default browser stack get "/", TimelineController, :index end web/router.ex

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TimelineController

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defmodule Sabiah.TimelineController do use Sabiah.Web, :controller def index(conn, _params) do render conn, "index.html" end end web/controllers/timeline_controller.ex

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defmodule Sabiah.TimelineController do use Sabiah.Web, :controller def index(conn, _params) do render conn, "index.html" end end web/controllers/timeline_controller.ex

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defmodule Sabiah.TimelineView do use Sabiah.Web, :view end web/views/timeline_view.ex

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Timeline

{{ tweet }}

web/templates/timeline/index.html.eex

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{{ }} ?

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new Vue({ el: '#app', data: { message: 'Hello world' } }); priv/examples/vue.html

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new Vue({ el: '#app', data: { message: 'Hello world' } }); priv/examples/vue.html

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priv/examples/vue.html

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Timeline

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Timeline

{{ tweet }}

web/templates/timeline/index.html.eex

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Precisamos da app Vue.js

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npm install --save vue

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Zero de conﬁguração

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import 'phoenix_html'; import Vue from 'vue/dist/vue'; new Vue({ el: '#timeline-app', data: { newTweet: '', tweets: [] }, methods: { postTweet: function() { this.tweets.unshift(this.newTweet); this.newTweet = ''; } } }); web/static/js/app.js

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Timeline

{{ tweet.content }}

web/templates/timeline/index.html.eex

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Temos uma timeline

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Enviando tweets Tweetar

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Web Sockets

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Phoenix Channels

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Um canal

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Uma timeline por usuário

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mix phoenix.gen.channel Timeline

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$ novo tweet timeline:42 Philip, id 42

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defmodule Sabiah.UserSocket do use Phoenix.Socket channel "timeline:*", Sabiah.TimelineChannel transport :websocket, Phoenix.Transports.WebSocket end web/channels/user_socket.ex

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defmodule Sabiah.UserSocket do use Phoenix.Socket channel "timeline:*", Sabiah.TimelineChannel transport :websocket, Phoenix.Transports.WebSocket end web/channels/user_socket.ex

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conecta timeline:42 Philip, id 42 $

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Conectamos pelo cliente JS

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import socket from './socket'; const userId = 42; let channel = socket.channel(`timeline:${userId}`, {}); channel.join() .receive('ok', resp => { console.log('Joined successfully', resp) }) .receive('error', resp => { console.log('Unable to join', resp) }); // The app ... web/static/js/app.js

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No Phoenix, aceitamos ou não

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defmodule Sabiah.TimelineChannel do use Sabiah.Web, :channel def join("timeline:", _payload, _socket) do {:error, %{reason: "User id is missing."}} end def join("timeline:" <> user_id, _payload, socket) do socket = assign(socket, :user_id, user_id) {:ok, socket} end def handle_in("new_tweet", payload, socket) do broadcast socket, "new_tweet", payload {:noreply, socket} end end web/channels/timeline_channel.ex

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Nosso canal aceita tweets

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novo tweet timeline:42 Philip, id 42 $

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O Phoenix envia a resposta

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novo tweet timeline:42 Philip, id 42 tweet $

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No content

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Salvando Tweets Tweetar

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É necessário um model

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Tweet user_id, content

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mix phoenix.gen.model Tweet tweets user_id:references:users content

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defmodule Sabiah.Tweet do use Sabiah.Web, :model schema "tweets" do field :content, :string belongs_to :user, Sabiah.User timestamps() end @doc """ Builds a changeset based on the `struct` and `params`. """ def changeset(struct, params \\ %{}) do struct |> cast(params, [:user_id, :content]) |> validate_required([:user_id, :content]) end end web/models/tweet.ex

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Precisamos salvar esse tweet

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alias Sabiah.Tweet def handle_in("new_tweet", %{ "content" => content } = payload, socket) do user_id = socket.assigns[:user_id] tweet_changeset = Tweet.changeset(%Tweet{}, %{user_id: user_id, content: content}) Repo.insert!(tweet_changeset) broadcast socket, "new_tweet", payload {:noreply, socket} end web/channels/timeline_channel.ex

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Pronto. Salvando tweets!

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Mas o que é um changeset?

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– Ecto.Changeset - https://hexdocs.pm/ecto/Ecto.Changeset.html “Changesets allow ﬁltering, casting, validation and deﬁnition of constraints when manipulating structs.”

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def changeset(struct, params \\ %{}) do struct |> cast(params, [:user_id, :content]) |> validate_required([:user_id, :content]) end web/models/tweet.ex

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Transforma e valida

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Pronto. Salvando tweets!

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sabiah ⏳ 1. tweetar ✅ 2. seguir 3. ver timeline com tweets de quem sigo

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Tweets para seguidores Seguir

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Seguidores

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Um model

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Follower

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Follower user_id, followed_user_id

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E o botão “Seguir”?

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No template, temos forms

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<%= for user <- @users do %> <%= user.name %> <%= user.username %> <%= form_for follower_changeset(user.id),  follower_path(@conn, :create), fn f -> %> <%= hidden_input f, :followed_user_id, value: user.id %> <%= submit "+ follow", class: "button" %> <% end %> <% end %> web/templates/user/index.html.eex

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O form recebe um changeset

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defmodule Sabiah.UserView do use Sabiah.Web, :view alias Sabiah.Follower def follower_changeset(user_id) do Follower.changeset(%Follower{followed_user_id: user_id}) end end web/views/user_view.ex

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Só falta o controller

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def create(conn, %{"follower" => params}) do user_id = get_session(conn, :user_id) params = Map.put(params, "user_id", user_id) changeset = Follower.changeset(%Follower{}, params) case Repo.insert(changeset) do {:ok, follow} -> conn |> put_flash(:info, "You are now following #{follow.followed_user_id}") |> redirect(to: user_path(conn, :index)) {:error, changeset} -> IO.inspect(changeset) conn |> put_flash(:error, "You seems to be logged out. Create an user to continue.") |> redirect(to: user_path(conn, :new)) end end web/views/user_view.ex

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sabiah ⏳ 1. tweetar ✅ 2. seguir ✅ 3. ver timeline com tweets de quem sigo

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( ) $ * novo tweet ??? $

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Broadcaster

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def handle_in("new_tweet", %{"content" => content}, socket) do user_id = socket.assigns[:user_id] tweet = save_tweet!(user_id, content) response_payload = decorate_payload(user_id, %{"content" => content}) broadcast socket, "new_tweet", response_payload TweetBroadcaster.broadcast_to_followers(tweet, response_payload) {:noreply, socket} end web/channels/timeline_channel.ex

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( ) $ * novo tweet broadcast! $

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defmodule Sabiah.TweetBroadcaster do alias Sabiah.{Endpoint, Repo} import Ecto.Query def broadcast_to_followers(tweet, payload) do followers_ids_query = from f in "followers", where: f.followed_user_id == ^tweet.user_id, select: f.user_id followers_ids = Repo.all(followers_ids_query) Enum.map(followers_ids, fn(user_id) -> Endpoint.broadcast!("timeline:#{user_id}", "new_tweet", payload) end) end end web/channels/tweet_broadcaster.ex

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( ) $ * novo tweet broadcast! $

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sabiah ⏳ 1. tweetar ✅ 2. seguir ✅ 3. ver timeline com tweets de quem sigo

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Há um detalhe faltando

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Salvar a timeline de cada usuário

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No content

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Veremos ao vivo

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[Perigo iminente]

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Conclusão

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Phoenix

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Vue.js

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Escolha a ferramenta

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Divirta-se!

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github.com/philss/sabiah

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• ElixirSchool - https://elixirschool.com/pt/ • Phoenix Guides - http://www.phoenixframework.org/docs/overview • Vue.js - http://vuejs.org/