feat: GitHubログイン機能を実装 (#66)

app/controllers/user_sessions_controller.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class UserSessionsController < ApplicationController
+  def create
+    user = User.find_or_create_from_auth_hash!(request.env['omniauth.auth'])
+    session[:user_id] = user.id
+    redirect_to new_group_path, notice: 'ログインしました'
+  end
+end

app/models/user.rb

@@ -3,4 +3,16 @@ class User < ApplicationRecord
   validates :uid, presence: true, uniqueness: { scope: :provider }
   validates :name, presence: true, uniqueness: true
   validates :image_url, presence: true, uniqueness: true
+
+  def self.find_or_create_from_auth_hash!(auth_hash)
+    provider = auth_hash[:provider]
+    uid = auth_hash[:uid]
+    nickname = auth_hash[:info][:nickname]
+    image_url = auth_hash[:info][:image]
+
+    User.find_or_create_by!(provider:, uid:) do |user|
+      user.name = nickname
+      user.image_url = image_url
+    end
+  end
 end

app/views/groups/index.html.slim

@@ -9,6 +9,9 @@ p.mb-4
 .mb-4
   = link_to '2次会グループを作成', new_group_path
 
+.mb-4
+  = button_to "GitHubでログイン", '/auth/github', data: { turbo: false }
+
 p.text-xl.font-bold.mb-4
   | 2次会グループ一覧
 

app/views/groups/new.html.slim

@@ -1,3 +1,5 @@
+p style="color: green" = notice
+
 h1.text-2xl.font-bold.mb-4
   | 2次会グループを作成
 

config/routes.rb

@@ -8,4 +8,5 @@
 
   # Defines the root path route ("/")
   root "groups#index"
+  get "auth/:provider/callback" => "user_sessions#create"
 end