【Rails】devise, devise_token_authで、ユーザー作成ログインの初期設定


#新規ユーザーモデルを作成する時

##deviseの設定

```shell:
$ rails g devise:install
      create  config/initializers/devise.rb
      create  config/locales/devise.en.yml
```

```routes.rb
Rails.application.routes.draw do

  devise_for :users, :controllers => {
    :registrations => 'users/registrations',
    :sessions => 'users/sessions'
  }

  devise_scope :user do
    get "sign_in", :to => "users/sessions#new"
    get "sign_out", :to => "users/sessions#destroy"
  end
end
```

<details><summary>devise_for :モデル名</summary>認証に必要なルーティングを自動で設定</details>

##devise_token_authの設定

```bash:
$ rails g devise_token_auth:install User auth
      create  config/initializers/devise_token_auth.rb
      insert  app/controllers/application_controller.rb
        gsub  config/routes.rb
      create  db/migrate/20200919181950_devise_token_auth_create_users.rb
      create  app/models/user.rb
```

```
$ rails db:migrate
```

<details><summary>User...</summary>モデル名</details>

<details><summary>auth...</summary>認証ルーティングをマウントするパス</details>

```routes.rb
Rails.application.routes.draw do
  mount_devise_token_auth_for 'User', controllers: {
    registrations: 'users'
  }
end
```

##deviseコントローラ

```
$ rails g devise:controllers users
      create  app/controllers/users/confirmations_controller.rb
      create  app/controllers/users/passwords_controller.rb
      create  app/controllers/users/registrations_controller.rb
      create  app/controllers/users/sessions_controller.rb
      create  app/controllers/users/unlocks_controller.rb
      create  app/controllers/users/omniauth_callbacks_controller.rb
```



#すでにUserモデルある場合

マイグレーション内容をいじる

```
class DeviseTokenAuthCreateUsers < ActiveRecord::Migration[6.0]
  def change


    change_table(:users) do |t|
      ## Required
      t.string :provider, :null => false, :default => "email"
      t.string :uid, :null => false, :default => ""


      ## Database authenticatable
      t.string :encrypted_password, :null => false, :default => ""


      ## Recoverable
      t.string   :reset_password_token
      t.datetime :reset_password_sent_at
      t.boolean  :allow_password_change, :default => false


      ## 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.string   :current_sign_in_ip
      t.string   :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


      ## User Info
      # t.string :name
      t.string :nickname
      t.string :image
      # t.string :email


      ## Tokens
      t.text :tokens


      # t.timestamps
    end


    add_index :users, :email,                unique: true
    add_index :users, [:uid, :provider],     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
end
```

####注意すべきことは、2つ

1. `change_table(:users)`にすること。（元は、`create_table`）
2. 既存のカラムはコメントアウトすること