gem install

gem 'devise'

Gemfileにgemを追加してbundle install

deviseのinstall

$ rails g devise:install

すると

Expected string default value for '--jbuilder'; got true (boolean)
      create  config/initializers/devise.rb
      create  config/locales/devise.en.yml
===============================================================================

Some setup you must do manually if you haven't yet:

  1. Ensure you have defined default url options in your environments files. Here
     is an example of default_url_options appropriate for a development environment
     in config/environments/development.rb:

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

     In production, :host should be set to the actual host of your application.

  2. Ensure you have defined root_url to *something* in your config/routes.rb.
     For example:

       root to: "home#index"

  3. Ensure you have flash messages in app/views/layouts/application.html.erb.
     For example:

       <p class="notice"><%= notice %></p>
       <p class="alert"><%= alert %></p>

  4. You can copy Devise views (for customization) to your app by running:

       rails g devise:views

===============================================================================

と出てくる

deviseのviewの作成

$ rails g devise:views

すると


Expected string default value for '--jbuilder'; got true (boolean)
Expected boolean default value for '--markerb'; got :erb (string)
      invoke  Devise::Generators::SharedViewsGenerator
      create    app/views/devise/shared
      create    app/views/devise/shared/_links.html.erb
      invoke  form_for
      create    app/views/devise/confirmations
      create    app/views/devise/confirmations/new.html.erb
      create    app/views/devise/passwords
      create    app/views/devise/passwords/edit.html.erb
      create    app/views/devise/passwords/new.html.erb
      create    app/views/devise/registrations
      create    app/views/devise/registrations/edit.html.erb
      create    app/views/devise/registrations/new.html.erb
      create    app/views/devise/sessions
      create    app/views/devise/sessions/new.html.erb
      create    app/views/devise/unlocks
      create    app/views/devise/unlocks/new.html.erb
      invoke  erb
      create    app/views/devise/mailer
      create    app/views/devise/mailer/confirmation_instructions.html.erb
      create    app/views/devise/mailer/password_change.html.erb
      create    app/views/devise/mailer/reset_password_instructions.html.erb
      create    app/views/devise/mailer/unlock_instructions.html.erb

と出てくる

user modelの作成

rails g devise User

とすると

      invoke  active_record
      create    db/migrate/20161209080359_devise_create_users.rb
      create    app/models/user.rb
      invoke    test_unit
      create      test/models/user_test.rb
      create      test/fixtures/users.yml
      insert    app/models/user.rb
       route  devise_for :users

となる

Schema ファイルの編集

生成されたmigrationは以下のようになっている


class DeviseCreateUsers < ActiveRecord::Migration
  def change
    create_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.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


      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
end

create_table内のループの中身をコピーしてridgepoleのSchemafileにコピペする

create_table "users" do |t|
  t.string "email",              null: false, default: ""
  t.string "encrypted_password", null: false, default: ""

  t.string "reset_password_token"
  t.datetime "reset_password_sent_at"

  t.datetime "remember_created_at"

  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"

  t.string "confirmation_token"
  t.datetime "confirmed_at"
  t.datetime "confirmation_sent_at"
  t.string "unconfirmed_email"

  t.integer "failed_attempts", default: 0, null: false
  t.string "unlock_token"
  t.datetime "locked_at"


  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

ridgepoleコマンドを叩く
migrationファイルを削除する


$ rm -rf db/migrate/

あとは普通のdeviseの使い方でOK

まとめ

migrationファイルをコピペして削除するだけ