Live code

app/controllers/pizzas_controller.rb

@@ -0,0 +1,29 @@
+class PizzasController < ApplicationController
+  def show
+    @pizza = Pizza.find(params[:id])
+    @pizzeria = @pizza.pizzeria
+  end
+
+  def new
+    @pizzeria = Pizzeria.find(params[:pizzeria_id])
+    @pizza = @pizzeria.pizzas.build
+  end
+
+  def create
+    @pizza = Pizza.new(pizza_params)
+    @pizzeria = @pizza.pizzeria
+
+    if @pizza.save
+      redirect_to pizzeria_pizza_path(@pizza.pizzeria, @pizza)
+    else
+      flash.now.alert = @pizza.errors.full_messages.to_sentence
+      render :new
+    end
+  end
+
+  private
+
+  def pizza_params
+    params.require(:pizza).permit(:pizzeria_id, :name, :description)
+  end
+end

app/controllers/pizzerias_controller.rb

@@ -5,7 +5,13 @@ def new
 
   def create
     @pizzeria = Pizzeria.create(pizzeria_params)
-    redirect_to @pizzeria
+
+    if @pizzeria.save
+      redirect_to @pizzeria
+    else
+      flash.now.alert = @pizzeria.errors.full_messages.to_sentence
+      render :new
+    end
   end
 
   def show
@@ -17,7 +23,8 @@ def index
   end
 
   private
+
   def pizzeria_params
-    params.require(:pizzeria).permit(:name,:address)
+    params.require(:pizzeria).permit(:name, :address)
   end
 end

app/models/pizza.rb

@@ -0,0 +1,5 @@
+class Pizza < ApplicationRecord
+  belongs_to :pizzeria
+
+  validates :name, :description, presence: true
+end

app/models/pizzeria.rb

@@ -1,3 +1,5 @@
 class Pizzeria < ApplicationRecord
-
+  has_many :pizzas
+
+  validates :name, :address, uniqueness: true
 end

app/views/layouts/application.html.erb

@@ -12,6 +12,11 @@
     <div class='container'>
       <p align="center"><%= image_tag "prisoners_pizza.png", class: "pizza_logo"%></p>
       <h1 align='center' style='font-size:3rem;color:#d12b15'>The NYC Pizza Society</h1>
+
+      <% if flash[:alert] %>
+        <div class="alert"><%= flash[:alert] %></div>
+      <% end %>
+
       <%= yield %>
     </div>
   </body>

app/views/pizzas/new.html.erb

@@ -0,0 +1,13 @@
+<h1>Tell us about this pizza you had at <%= @pizzeria.name %></h1>
+
+<%= form_with model: [@pizzeria, @pizza], local: true do |form| %>
+  <%= form.hidden_field :pizzeria_id %>
+
+  <%= form.label :name %>
+  <%= form.text_field :name %>
+
+  <%= form.label :description %>
+  <%= form.text_field :description %>
+
+  <%= form.submit %>
+<% end %>

app/views/pizzas/show.html.erb

@@ -0,0 +1,3 @@
+<h1><%= @pizza.name %> from <%= link_to @pizzeria.name, pizzeria_path(@pizzeria) %></h1>
+
+<p>Description: <%= @pizza.description %></p>

app/views/pizzerias/show.html.erb

@@ -1,2 +1,12 @@
 <h1 style='margin-top:100px'>Pizzeria name: <%= @pizzeria.name %></h1>
 <p>Address: <%= @pizzeria.address %></p>
+
+<%= link_to "Tell us about a great Pizza you had at #{@pizzeria.name}", new_pizzeria_pizza_path(@pizzeria) %>
+
+<br /><br /><br />
+
+<h1>Great eats from <%= @pizzeria.name %>:</h1>
+<% @pizzeria.pizzas.each do |pizza| %>
+  <%= link_to pizza.name, pizzeria_pizza_path(@pizzeria, pizza) %>
+  <br />
+<% end %>

config/routes.rb

@@ -1,6 +1,5 @@
 Rails.application.routes.draw do
-  get '/pizzerias/new', to: 'pizzerias#new', as: 'new_pizzeria'
-  post '/pizzerias', to: 'pizzerias#create', as: 'pizzerias'
-  get '/pizzerias/:id', to: 'pizzerias#show', as: 'pizzeria'
-  get '/pizzerias', to: 'pizzerias#index'
+  resources :pizzerias, only: %i[index show new create] do
+    resources :pizzas, only: %i[show new create]
+  end
 end

db/migrate/20240821171832_create_pizzas.rb

@@ -0,0 +1,9 @@
+class CreatePizzas < ActiveRecord::Migration[5.1]
+  def change
+    create_table :pizzas do |t|
+      t.references :pizzeria
+      t.string :name
+      t.string :description
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,14 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170814143728) do
+ActiveRecord::Schema.define(version: 20240821171832) do
+
+  create_table "pizzas", force: :cascade do |t|
+    t.integer "pizzeria_id"
+    t.string "name"
+    t.string "description"
+    t.index ["pizzeria_id"], name: "index_pizzas_on_pizzeria_id"
+  end
 
   create_table "pizzerias", force: :cascade do |t|
     t.string "name"