Implement basic login

Author: mhartl

app/assets/config/manifest.js

@@ -1,2 +1,4 @@
 //= link_tree ../images
 //= link_directory ../stylesheets .css
+//= link_tree ../../javascript .js
+//= link_tree ../../../vendor/javascript .js

app/assets/stylesheets/custom.scss

@@ -102,6 +102,23 @@ footer {
     }
   }
 }
+@media (max-width: 800px) {
+  footer {
+    small {
+      display: block;
+      float: none;
+      margin-bottom: 1em;
+    }
+    ul {
+      float: none;
+      padding: 0;
+      li {
+        float: none;
+        margin-left: 0;
+      }
+    }
+  }
+}
 
 /* miscellaneous */
 
@@ -110,6 +127,7 @@ footer {
   float: left;
   width: 100%;
   margin-top: 45px;
+  @include box_sizing;
 }
 
 /* sidebar */
@@ -176,3 +194,9 @@ input {
     color: $state-danger-text;
   }
 }
+
+/* Dropdown menu */
+
+.dropdown-menu.active {
+  display: block;
+}

app/controllers/application_controller.rb

@@ -1,6 +1,3 @@
 class ApplicationController < ActionController::Base
-
-  def hello
-    render html: "hello, world!"
-  end
+  include SessionsHelper
 end

app/controllers/sessions_controller.rb

@@ -0,0 +1,22 @@
+class SessionsController < ApplicationController
+
+  def new
+  end
+
+  def create
+    user = User.find_by(email: params[:session][:email].downcase)
+    if user && user.authenticate(params[:session][:password])
+      reset_session
+      log_in user
+      redirect_to user
+    else
+      flash.now[:danger] = 'Invalid email/password combination'
+      render 'new', status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    log_out
+    redirect_to root_url, status: :see_other
+  end
+end

app/controllers/static_pages_controller.rb

@@ -7,7 +7,7 @@ def help
 
   def about
   end
-
+  
   def contact
   end
 end

app/controllers/users_controller.rb

@@ -11,6 +11,8 @@ def new
   def create
     @user = User.new(user_params)
     if @user.save
+      reset_session
+      log_in @user
       flash[:success] = "Welcome to the Sample App!"
       redirect_to @user
     else
@@ -24,4 +26,4 @@ def user_params
       params.require(:user).permit(:name, :email, :password,
                                    :password_confirmation)
     end
-end
+end

app/helpers/sessions_helper.rb

@@ -0,0 +1,25 @@
+module SessionsHelper
+
+  # Logs in the given user.
+  def log_in(user)
+    session[:user_id] = user.id
+  end
+
+  # Returns the current logged-in user (if any).
+  def current_user
+    if session[:user_id]
+      @current_user ||= User.find_by(id: session[:user_id])
+    end
+  end
+
+  # Returns true if the user is logged in, false otherwise.
+  def logged_in?
+    !current_user.nil?
+  end
+
+  # Logs out the current user.
+  def log_out
+    reset_session
+    @current_user = nil
+  end
+end

app/javascript/application.js

@@ -0,0 +1,5 @@
+// Configure your import map in config/importmap.rb.
+// Read more: https://github.com/rails/importmap-rails
+import "@hotwired/turbo-rails"
+import "controllers"
+import "custom/menu"

app/javascript/controllers/application.js

@@ -0,0 +1,9 @@
+import { Application } from "@hotwired/stimulus"
+
+const application = Application.start()
+
+// Configure Stimulus development experience
+application.debug = false
+window.Stimulus   = application
+
+export { application }

app/javascript/controllers/hello_controller.js

@@ -0,0 +1,7 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  connect() {
+    this.element.textContent = "Hello World!"
+  }
+}