[RUBY] Implement login function in Rails simply by name and password (2)

Continuation of Last time. From here, we will implement the login screen and login process.

procedure

--Create a Session controller

MacBook % rails g controller Sessions new

--Edit the routes file as below

`config/routes`


Rails.application.routes.draw do
get '/login', to: 'sessions#new'
post '/login', to: 'sessions#create'
delete '/logout', to: 'sessions#destroy'
~

--Next, create a login form. This time it is a direct writing without using Bootstrap etc.

`app/views/sessions/new.html.erb`


<body>
  <h1>Login</h1>
  <%= form_for(:session, url: login_path) do |f| %>
    <div class="input-name">
      <%= f.label :password, 'Room name' %>
      <%= f.text_field :name, placeholder: "Please enter the name of the room" %>
    </div>
    <div class="form-group">
      <%= f.label :password, 'password' %>
      <%= f.password_field :password, placeholder: 'Please enter your password' %>
      <%= f.submit 'Login' %>
    </div>
  <% end %>
</body>

--Create a form and access http: // localhost: 3000 / login to check --Once confirmed, then add create and destroy actions to the controller actions

`app/controllers/sessions_controller.rb`


class SessionsController < ApplicationController
  def new
  end

  def create
    room = Room.find_by(name: params[:session][:name])
    if room && room.authenticate(params[:session][:password])
    else
    end
  end

  def destroy
  end
end

--Write the process when login fails in the create action. (Bootstrap etc. are not used)

`app/controllers/sessions_controller.rb`


~
  def create
    room = Room.find_by(name: params[:session][:name])
    if room && room.authenticate(params[:session][:password])
    else
      flash[:alert] = 'The name or password is wrong'
      redirect_to '/login'
    end
  end
~

--Added session helper that automatically expires when you close the browser

`app/controllers/application_controller.rb`


class ApplicationController < ActionController::Base
  include SessionsHelper
end

--Define helper method and log_in method

`app/helpers/sessions_helper.rb`


module SessionsHelper
  #Store encrypted roomID in temporary cookies in the browser
  def log_in(room)
    session[:room_id] = room.id
  end
end

--Now you can log in, so define the create action

`/app/controllers/sessions_controller.rb`


~
  def create
    room = Room.find_by(name: params[:session][:name])
    if room && room.authenticate(params[:session][:password])
      log_in room
      redirect_to receptions_path
    else
      flash[:alert] = 'The name or password is wrong'
      redirect_to '/login'
    end
  end
~