Issue #12 🎫: General Shopping List (Shopping List)

app/controllers/shopping_lists_controller.rb

@@ -0,0 +1,30 @@
+class ShoppingListsController < ApplicationController
+  def show
+    user_recipes = current_user.recipes
+
+    ingredients = []
+    user_recipes.each do |recipe|
+      recipe.recipe_foods.each do |rf|
+        ingredients << { food: rf.food, quantity: rf.quantity }
+      end
+    end
+
+    combined_ingredients = Hash.new(0)
+    ingredients.each do |ingredient|
+      combined_ingredients[ingredient[:food]] += ingredient[:quantity]
+    end
+
+    @items_to_buy = []
+    combined_ingredients.each do |current_food, required_quantity|
+      existing_quantity = current_food.quantity
+
+      next unless required_quantity > existing_quantity
+
+      difference = required_quantity - existing_quantity
+      unit_food_price = current_food.price
+      @items_to_buy << { food: current_food, quantity: difference, unit_price: unit_food_price }
+    end
+
+    @items_to_buy
+  end
+end

app/views/layouts/_navbar.html.erb

@@ -12,17 +12,14 @@
                 </li>
 
                 <% if user_signed_in? %>
-
-                <% # ! UPDATE THE LINKS BELOW TO POINT TO THE CORRECT PATHS %>
-
                     <li class="nav-item">
                         <%= link_to "My-recipes", recipes_path, class: "nav-link" %>
                     </li>
                     <li class="nav-item">
                         <%= link_to "Food-List", foods_path, class: "nav-link" %>
                     </li>
                     <li class="nav-item">
-                        <%= link_to "Shopping-list", root_path, class: "nav-link" %>
+                        <%= link_to "Shopping-List", shopping_list_path(id: "show"), class: "nav-link" %>
                     </li>
                 <% end %>
             </ul>

app/views/recipes/show.html.erb

@@ -2,7 +2,7 @@
 <%= render @recipe %>
 
 <div class="d-flex justify-content-around p-3 m-1">
-  <button>Generate Shopping list</button>
+  <%= link_to "Generate shopping list", shopping_list_path, method: :get, class: "btn btn-outline-success" %>
   <% if @recipe.user == current_user %>
     <%= link_to "Add ingredient", new_recipe_food_path(recipe_id: @recipe.id), class: "btn btn-outline-success" %>
   <% end %>
@@ -32,7 +32,7 @@
           <tr>
             <td><%= ingredient.food.name %></td>
             <td><%= "#{ingredient.quantity}#{ingredient.food.measurement_unit}" %></td>
-            <td><%= "$#{ingredient.food.price*ingredient.quantity}" %></td>
+            <td><%= "$#{ingredient.food.price * ingredient.quantity}" %></td>
             <% if @recipe.user == current_user %>
               <td><%= link_to "Modify", edit_recipe_food_path(ingredient), class: "btn btn-ountline-danger", method: :update, data: { "turbo-method": :update } %></td>
               <td><%= link_to "Delete", ingredient, class: "btn btn-ountline-danger", method: :delete, data: { "turbo-method": :delete } %></td>

app/views/shopping_lists/show.html.erb

@@ -0,0 +1,52 @@
+<div id= "shopping-list">
+    <h2 class="text-center font-weight-bold mt-4">
+        <span class="text-danger">Your</span>
+        <span class="text-warning">Shopping List</span>
+    </h2>
+    <div class="d-flex justify-content-around flex-wrap m-2 mt-3 mb-3">
+        <p class="p-2">
+        <strong>
+            Amount of food items to buy: 
+                <span class="text-success">
+                    <%= @items_to_buy.count %>
+                </span>
+        <strong>    
+        </p>
+        <p class="p-2">
+        <strong>
+            Total value of food needed: 
+                <span class="text-danger">
+                    $<%= @items_to_buy.sum { |item| item[:quantity] * item[:unit_price] } %>
+                </span>
+        </strong>
+        </p>
+    </div>
+
+    <div id="foods">
+        <% if @items_to_buy.empty? %>
+        <div class="alert alert-info text-center">
+            <p class="mb-0">Your shopping list is empty.</p>
+        </div>
+        <% else %>
+            <table class="table table-hover table-striped border">
+                <thead>
+                    <tr>
+                        <th>Food</th>
+                        <th>Quantity</th>
+                        <th>Price</th>
+                    </tr>
+                </thead>
+
+                <tbody>
+                    <% @items_to_buy.each do |item| %>
+                        <tr>
+                            <td><%= item[:food].name %></td>
+                            <td><%= item[:quantity] %></td>
+                            <td>$<%= item[:quantity] * item[:unit_price] %></td>
+                        </tr>
+                    <% end %>
+                </tbody>
+            </table>
+        <% end %>
+    </div>
+</div>

config/routes.rb

@@ -2,6 +2,7 @@
   resources :foods
   resources :recipes
   resources :recipe_foods
+  resources :shopping_lists, only: [:show]
   devise_for :users
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 

spec/controllers/shopping_lists_controller_spec.rb

@@ -0,0 +1,21 @@
+require 'rails_helper'
+
+RSpec.describe ShoppingListsController, type: :controller do
+  include Devise::Test::ControllerHelpers
+
+  new_user = FactoryBot.create(:user)
+  recipe = FactoryBot.create(:recipe, user: new_user)
+  food = FactoryBot.create(:food)
+  FactoryBot.create(:recipe_food, recipe_id: recipe.id, food_id: food.id, quantity: 2)
+
+  before do
+    sign_in new_user
+  end
+
+  describe 'GET #show' do
+    it 'assigns @items_to_buy' do
+      get :show, params: { id: 'show' }
+      expect(response).to be_successful
+    end
+  end
+end

spec/views/shopping_lists/show.html.erb_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+RSpec.describe 'ShoppingLists#show', type: :system do
+  let(:new_user) { create(:user) }
+
+  describe 'show page' do
+    before(:each) do
+      visit new_user_session_path
+
+      fill_in 'Email', with: new_user.email
+      fill_in 'Password', with: new_user.password
+      click_button 'Log in'
+    end
+
+    it 'displays a list of items to buy' do
+      recipe = create(:recipe, user: new_user)
+      food = create(:food)
+      create(:recipe_food, recipe_id: recipe.id, food_id: food.id, quantity: 2000)
+
+      visit shopping_list_path(id: 'show')
+
+      within('#shopping-list', wait: 5) do
+        expect(page).to have_selector('table')
+        expect(page).to have_selector('th', text: 'Food')
+        expect(page).to have_selector('th', text: 'Quantity')
+        expect(page).to have_selector('th', text: 'Price')
+      end
+    end
+  end
+end