List of copy and paste collections that are useful when creating apps with Ruby on Rails

When creating an app with Rails, I've put together some code that I found useful in the early stages of creation (for myself).

Install Ruby on Rails

% rails _6.0.0_ new 'file name' -d mysql

Things to set before creating a database


# encoding: utf8mb4
=> encoding: utf8

I can't explain in detail yet, but if it remains utf8mb4, it cannot be migrated well due to the number of bytes. Please refer to here for the correspondence when creating a database with utf8mb4. 【MySQL】Mysql2::Error: Specified key was too long; max key length is 767 bytes

If you make a mistake in setting the database and create a database
  • Delete the database
% rails db:drop
% rails db:create

Gem you want to install


gem 'devise'             #Implementation of user registration function
gem 'mysql2', '>= 0.5.3' #Change mysql version
gem 'pry-rails'          #Used when checking for errors and testing
gem 'mini_magick'        #Gem for using ImageMagick
gem 'image_processing'   #Gem to adjust image size
gem 'active_hash'        #A gem that is convenient when dealing with static data such as prefectures

Apply reset CSS

The browser has CSS set by default, so apply it to reset it.


  <link rel="stylesheet" type="text/css" href="">

Set the element size

If you leave nothing set, when you set padding or border with CSS, it may become an unintended size, so set it so that it has the desired element size.


* {
  box-sizing: border-box;

Set various devise

% rails g devise:install
% rails g devise user
% rails g devise:views

% rails db:migrate

Restrict viewing by unlogged-in users


before_action :authenticate_user!, except: [:index, :show]

Allow columns other than email and password set in devise to be used


  before_action :configure_permitted_parameters, if: :devise_controller?

  def configure_permitted_parameters
    devise_parameter_sanitizer.permit(:sign_up, keys: [:])

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