[RUBY] Summary about the introduction of Device

* The notes are filled in from application creation to Devise installation.


ruby 6.0.0 rails mysql2 0.5.3 devise 4.7.3

Create in the above environment.

Simple flow

① Launch the application you want to create.


% rails _6.0.0_new app name-d mysql

(2) Rewrite the description of database.yml in the app.


default: &default
  adapter: mysql2
#↓ ↓ Originally encoding: utf8mb4
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  socket: /tmp/mysql.sock

#The following is omitted

③ Enter the gem you want to add to the bottom layer in the gemfile.


# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem 'pry-rails'
gem 'devise'

④ Load the gem.


% bundle install


% yarn install

⑤ Create a database in the directory of the created application on the console.


% rails db:create

⑥ Install Devise on the app.


% rails g devise:install

(7) Generate a model using Devise. (Migration files and routing are also automatically generated.)


#Model name is singular
%rails g devise model name

⑧ Create a view file for new registration and login.


% rails g devise:views

⑨ Start the local server.


% rails s

⑩ Describe the column to be added to the migration file.

  1. Migrate the table.


% rails db:migrate
  1. Make each edit / setting. view/devise/registrations → Edit new registration screen view/devise/sessions → Edit login screen model/table name.rb → Validation settings

  2. Edit application_controller.rb.


class ApplicationController < ActionController::Base
  before_action :configure_permitted_parameters, if: :devise_controller?

  def configure_permitted_parameters
#The content of keys is the column name added to the devise table
    devise_parameter_sanitizer.permit(:sign_up, keys: [:Column 1, :Column 2, ‥])

that's all

Other notes etc.

-The routing to reach the new registration page and login page is automatically generated when the model is created.

-Since the controller processing required for the user management function is hidden behind the scenes, it will be described in "application_controller.rb" that controls the controller.

・ If "rails g devise: install" doesn't work, try the following.


$ bundle exec spring stop

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