Railsにユーザ認証機能を追加(devise)

install

# Flexible authentication solution for Rails with Warden.
gem 'devise'

bundle install
bin/rails g devise:install

config/initializers/devise.eb ･･･ Deviseの設定を行うファイル config/locals/devise.en.yml ･･･ Deviseのローカライゼーション用ファイル

config/environments/development.rb

config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

root urlを指定: config/routes.rb

root to: "home#index"

Flash Messageを追加: app/views/layouts/application.html.slim

p.notice= notice
p.alert= alert

View Fileを作成

bin/rails g devise:views

secret_keyの発行?

bin/rails secret
f63f6ce0e65208abe21abeaa8d3db687836e850771d740b9e21ce4fd7960b97b640be6c45d92d8d10b9c4f681a4e4a0717928035d42d671073f7682a920057b8

Deviseに紐付いたモデルの作成

bin/rails g devise user

Deviceの利用するモジュールを指定: app/models/user.rb

class User < ApplicationRecord
  devise :database_authenticatable,
         :registerable,
         :recoverable,
         :rememberable,
         :validatable,
         :confirmable,
         :lockable,
         :timeoutable,
         :omniauthable
end

MigrationFileを変更:

# frozen_string_literal: true

class AddDeviseToUsers < ActiveRecord::Migration[6.0]
  def self.up
    change_table :users do |t|
      ## Database authenticatable
      t.string :email,              null: false, default: ""
      t.string :encrypted_password, null: false, default: ""

      ## Recoverable
      t.string   :reset_password_token
      t.datetime :reset_password_sent_at

      ## Rememberable
      t.datetime :remember_created_at

      ## Trackable
      t.integer  :sign_in_count, default: 0, null: false
      t.datetime :current_sign_in_at
      t.datetime :last_sign_in_at
      t.inet     :current_sign_in_ip
      t.inet     :last_sign_in_ip

      # Confirmable
      t.string   :confirmation_token
      t.datetime :confirmed_at
      t.datetime :confirmation_sent_at
      t.string   :unconfirmed_email # Only if using reconfirmable

      # Lockable
      t.integer  :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
      t.string   :unlock_token # Only if unlock strategy is :email or :both
      t.datetime :locked_at

      # Uncomment below if timestamps were not included in your original model.
      # t.timestamps null: false
    end

    add_index :users, :email,                unique: true
    add_index :users, :reset_password_token, unique: true
    add_index :users, :confirmation_token,   unique: true
    add_index :users, :unlock_token,         unique: true
  end

  def self.down
    # By default, we don't want to make any assumption about how to roll back a migration when your
    # model already existed. Please edit below which fields you would like to remove in this migration.
    raise ActiveRecord::IrreversibleMigration
  end
end

Migration

bundle exec rails db:migrate

Annotate

bundle exec annotate

erbをslimに追加

bundle exec erb2slim app/views/devise/ --delete