Add flash notices for sign in, sign out, sign up

app/controllers/user_sessions_controller.rb

@@ -11,9 +11,9 @@ class UserSessionsController < ApplicationController
     if authenticate_user?(user)
       create_user_session(user)
 
-      redirect_to root_path
+      redirect_to root_path, notice: 'You have been logged in!'
     else
-      render :new
+      redirect_to signin_path, alert: 'Username or password was incorrect!'
     end
   end
 
@@ -21,7 +21,7 @@ class UserSessionsController < ApplicationController
     cookies.permanent[:user_session] = nil
     current_session.destroy if current_session
 
-    redirect_to root_path
+    redirect_to root_path, notice: 'You have been logged out!'
   end
 
   private

app/controllers/users_controller.rb

@@ -7,7 +7,7 @@ class UsersController < ApplicationController
     @user = User.new(user_params)
 
     if @user.save
-      redirect_to signin_path
+      redirect_to signin_path, notice: 'Your user account has been created'
     else
       render :new
     end

app/helpers/application_helper.rb

@@ -1,2 +1,16 @@
 module ApplicationHelper
+  def bootstrap_class_for(flash_type)
+    bootstrap_classes[flash_type] || flash_type.to_s
+  end
+
+  private
+
+  def bootstrap_classes
+  {
+    'alert'   => 'alert-warning',
+    'error'   => 'alert-danger',
+    'notice'  => 'alert-info',
+    'success' => 'alert-success'
+  }
+end
 end

app/views/application/_flash_message.html.slim

@@ -0,0 +1,5 @@
+.alert.slide.up class=bootstrap_class_for(type)
+  button.close type='button' data-dismiss='alert'
+    span aria-hidden='true' ×
+    span.sr-only Close
+  = message

app/views/application/_flash_messages.html.slim

@@ -0,0 +1,2 @@
+- flash.each do |type, message|
+  = render 'flash_message', type: type, message: message

app/views/layouts/application.html.slim

@@ -8,6 +8,8 @@ html
 
   body
     == render 'navbar'
+    .container
+      == render 'flash_messages'
 
     .container-fluid
       = yield

spec/controllers/user_sessions_controller_spec.rb

@@ -42,6 +42,12 @@ describe UserSessionsController, type: :controller do
 
         expect(response).to redirect_to(root_path)
       end
+
+      it 'should send notice' do
+        post :create, user_session: data
+
+        expect(flash[:notice]).to be_present
+      end
     end
 
     context 'with invalid credentials' do
@@ -61,12 +67,20 @@ describe UserSessionsController, type: :controller do
         end.to change(UserSession, :count).by(0)
       end
 
-      it 'should render :new' do
+      it 'should redirect to login page' do
         data['username'] = ''
 
         post :create, user_session: data
 
-        expect(response).to render_template(:new)
+        expect(response).to redirect_to signin_path
+      end
+
+      it 'should send an error flash message' do
+        data['username'] = ''
+
+        post :create, user_session: data
+
+        expect(flash[:alert]).to be_present
       end
     end
   end
@@ -104,6 +118,12 @@ describe UserSessionsController, type: :controller do
 
         expect(response).to redirect_to(root_path)
       end
+
+      it 'should send a notice' do
+        delete :destroy
+
+        expect(flash[:notice]).to be_present
+      end
     end
   end
 end

spec/controllers/users_controller_spec.rb

@@ -34,6 +34,12 @@ describe UsersController, type: :controller do
 
         expect(response).to redirect_to signin_path
       end
+
+      it 'should send a notice flash message' do
+        post :create, user: data
+
+        expect(flash[:notice]).to be_present
+      end
     end
 
     context 'with invalid data' do

spec/helpers/application_helper_spec.rb

@@ -0,0 +1,29 @@
+require 'rails_helper'
+
+describe ApplicationHelper do
+  describe '#bootstrap_class_for' do
+    context 'when known flash_type' do
+      it 'should return the appropriate class for the alert flash_type' do
+        expect(helper.bootstrap_class_for('alert')).to eq('alert-warning')
+      end
+
+      it 'should return the appropriate class for the error flash_type' do
+        expect(helper.bootstrap_class_for('error')).to eq('alert-danger')
+      end
+
+      it 'should return the appropriate class for the notice flash_type' do
+        expect(helper.bootstrap_class_for('notice')).to eq('alert-info')
+      end
+
+      it 'should return the appropriate class for the success flash_type' do
+        expect(helper.bootstrap_class_for('success')).to eq('alert-success')
+      end
+    end
+
+    context 'when unknown flash_type' do
+      it 'should return the class as the flash_type that was given' do
+        expect(helper.bootstrap_class_for('test')).to eq('test')
+      end
+    end
+  end
+end