[Implementation procedure] Create a user authentication function using sorcery in Rails

Note that I had a hard time implementing the authentication function in Rails

Work environment

• Mac
• ruby 2.6.5
• rails 5.2.3
• bootstrap4

What is sorcery

A library for implementing authentication functions in Rails. Similarly, devise is one of the authentication functions, but sorcery is simpler and more customizable. Click here for sorcer's github

Implementation procedure

installation of sorcery

Gemfile

gem 'sorcery'

Terminal

$ bundle install

Generate User model and migration file

Terminal

$ rails g sorcery:install

By typing the above command, the migration file of the user model and database will be generated. ・ App / models / user.rb ・ Config / initializers / sorcery.rb ・ Db / migrate / yyyymmddhhmmss_sorcery_core.rb

Constraint the database

db/migrate/yyyymmddhhmmss_sorcery_core.rb

class SorceryCore < ActiveRecord::Migration[5.2]
  def change
    create_table :users do |t|
      t.string :name, null: false
      t.string :email, null: false
      t.string :crypted_password
      t.string :salt, null: false

      t.timestamps null: false
    end

    add_index :users, :email, unique: true
  end
end

This time, let's assume that we have columns for name, email, and password.

--Added null: false to the required items.

--The reason for putting restrictions is that if you do not put restrictions on the database side, executing SQL or directly manipulating data may result in inconsistent data prohibited by the model.

--Add to add_index for items that you want to make uniqueness: true in the model. The description method for add_index is as follows. add_index: table name,: column name, unique: true

Terminal

$ rails db:migrate

--After describing the restrictions on migration, generate the users table with the above command.

Constraint the User model

app/modeks/user.rb

class User < ApplicationRecord
  authenticates_with_sorcery!
  validates :name, presence: true, length: { maximum: 255 } #Constraint length with length
  validates :email, presence: true, uniqueness: true #Constraint uniqueness with uniqueness
  validates :password, length: { minimum: 3 }, if: -> { new_record? || changes[:crypted_password] }
  validates :password, confirmation: true, if: -> { new_record? || changes[:crypted_password] }
  validates :password_confirmation, presence: true, if: -> { new_record? || changes[:crypted_password] }
end

--By writing presence: true, you can prevent SQL from saving in an empty state without inputting empty characters from the browser.

--Since I added the constraint (null: false and add_index: users,: email, unique: true) on the database side, Let's also constrain (presence: true or uniqueness in validates) on the model side.

• if: -> { new_record? || changes[:crypted_password] } This description allows the user to omit entering the password if he / she wants to update a profile item other than the password.

Generate users controller

Terminal

$ rails g controller users new create

app/controllers/users_controller.rb

class UsersController < ApplicationController
  def new
    @user = User.new
  end

  def create
    @user = User.new(user_params)
    if @user.save
      redirect_to login_path
    else
      render :new
    end
  end

  private

  def user_params
    params.require(:user).permit(:name, :email, :password, :password_confirmation)
  end
end

--If user registration is successful with create action, redirect to the login screen. If it fails, you can return to the login screen again.

Generation of user registration screen (new registration)

ruby:app/views/users/new.html.erb

<%= form_with model: @user, local: true do |f| %>
  <div class="form-group">
    <%= f.label :name %>
    <%= f.text_field :name, class: 'form-control' %>
  </div>
  <div class="form-group">
    <%= f.label :email %>
    <%= f.text_field :email, class: 'form-control' %>
  </div>
  <div class="form-group">
    <%= f.label :password %>
    <%= f.text_field :password, class: 'form-control' %>
  </div>
  <div class="form-group">
    <%= f.label :password_confirmation %>
    <%= f.text_field :password_confirmation, class: 'form-control' %>
  </div>
  <%= f.submit 'Registration', class: 'btn btn-primary' %>
<% end %>
<div class='text-center'>
  <%= link_to 'Go to login page', login_path %>
</div>

--Template for user registration.

--How to use form_with. Pass the entered value to the instance variable @user! Declared. It can also be described as users_path. The data entered here is sent to create. The contents of the form are in user_params or params [: user].