Introducing devise

Introduction flow of devise with Rails

1. Install Gem and restart the server

2. Create a devise configuration file using commands

3. Create a User model using commands

4. Implementation that changes the button display when not logged in and when logged in

5. Set redirect on controller

devise gem installation

Gemfile

#Omission
gem 'devise'

Terminal

#Start the server
% rails s

Execute the command to create a configuration file

Terminal

#Create devise config file
% rails g devise:install

Execute the command to create a User model

Terminal

#Create User model with devise command
% rails g devise user

Perform migration

Terminal

#Perform migration
% rails db:migrate

Reboot local server

Terminal

# 「ctrl +Quit the local server with "C"

#Start the local server again
% rails s

Prepare redirect process

app/controllers/tweets_controller.rb

class TweetsController < ApplicationController
  before_action :set_tweet, only: [:edit, :show]
  before_action :move_to_index, except: [:index, :show]

  def index
    @tweets = Tweet.all
  end

  def new
    @tweet = Tweet.new
  end

  def create
    Tweet.create(tweet_params)
  end

  def destroy
    tweet = Tweet.find(params[:id])
    tweet.destroy
  end

  def edit
  end

  def update
    tweet = Tweet.find(params[:id])
    tweet.update(tweet_params)
  end

  def show
  end

  private
  def tweet_params
    params.require(:tweet).permit(:name, :image, :text)
  end

  def set_tweet
    @tweet = Tweet.find(params[:id])
  end

  def move_to_index
    unless user_signed_in?
      redirect_to action: :index
    end
  end
end

Run the command to create a view for devise

Terminal

rails g devise:views

Add nickname column as string type to users table

Terminal

#Make sure the directory is pictweet
% pwd

#Create a migration file that adds a nickname column of type string to the users table
% rails g migration AddNicknameToUsers nickname:string

#Execute the created migration
% rails db:migrate

Terminal

# 「ctrl +Quit the local server with "C"

#Start the local server again
% rails s

Edit application_controller.rb

app/controllers/application_controller.rb

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

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

that's all!

By default, email and password work internally in devise, so if you don't add columns, you don't need to write them in the parameters!