- server.js: fix cookies and redirects + more controller lessons

Author: palkan

src/content/tutorial/8-controllers/4-crud-show/_files/.tk-config.json

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+{
+  "extends": "../../../../../templates/products-controller"
+}

src/content/tutorial/8-controllers/4-crud-show/_files/workspace/.keep

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+class ProductsController < ApplicationController
+  def index
+    @products = Product.all
+  end
+end

src/content/tutorial/8-controllers/4-crud-show/_files/workspace/store/app/controllers/products_controller.rb

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+<h1>Products</h1>
+
+<div id="products">
+  <% @products.each do |product| %>
+    <div>
+      <%= product.name %>
+    </div>
+  <% end %>
+</div>

src/content/tutorial/8-controllers/4-crud-show/_files/workspace/store/app/views/products/index.html.erb

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+Rails.application.routes.draw do
+  resources :products
+
+  # Defines the root path route ("/")
+  root "products#index"
+end

src/content/tutorial/8-controllers/4-crud-show/_files/workspace/store/config/routes.rb

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+---
+type: lesson
+title: "CRUD: Showing Individual Products"
+focus: /workspace/store/app/controllers/products_controller.rb
+previews:
+  - 3000
+custom:
+  shell:
+    workdir: "/workspace/store"
+---
+
+### CRUD Actions
+
+We need to be able to access individual products. This is the R in CRUD to read
+a resource.
+
+We've already defined the route for individual products with our
+`resources :products` route. This generates `/products/:id` as a route that
+points to `products#show`.
+
+Now we need to add that action to the `ProductsController` and define what
+happens when it is called.
+
+Open the Products controller and add the `show` action like this:
+
+```ruby ins={5-8}
+class ProductsController < ApplicationController
+  def index
+    @products = Product.all
+  end
+
+  def show
+    @product = Product.find(params[:id])
+  end
+end
+```
+
+The `show` action here defines the *singular* `@product` because it's loading a
+single record from the database, in other words: Show this one product. We use
+plural `@products` in `index` because we're loading multiple products.
+
+To query the database, we use `params` to access the request parameters. In this
+case, we're using the `:id` from our route `/products/:id`. When we visit
+`/products/1`, the params hash contains `{id: 1}` which results in our `show`
+action calling `Product.find(1)` to load Product with ID of `1` from the
+database.
+
+We need a view for the show action next. Following the Rails naming conventions,
+the `ProductsController` expects views in `app/views` in a subfolder named
+`products`.
+
+The `show` action expects a file in `app/views/products/show.html.erb`. Let's
+create that file in our editor and add the following contents:
+
+```erb
+<h1><%= @product.name %></h1>
+
+<%= link_to "Back", products_path %>
+```
+
+It would be helpful for the index page to link to the show page for each product
+so we can click on them to navigate. We can update the
+`app/views/products/index.html.erb` view to link to this new page to use an
+anchor tag to the path for the `show` action.
+
+```erb {6-8}
+<h1>Products</h1>
+
+<div id="products">
+  <% @products.each do |product| %>
+    <div>
+      <a href="/products/<%= product.id %>">
+        <%= product.name %>
+      </a>
+    </div>
+  <% end %>
+</div>
+```
+
+Refresh this page in your browser and you'll see that this works, but we can do
+better.
+
+Rails provides helper methods for generating paths and URLs. When you run
+`bin/rails routes`, you'll see the Prefix column. This prefix matches the
+helpers you can use for generating URLs with Ruby code.
+
+```
+                                  Prefix Verb   URI Pattern                                                                                       Controller#Action
+                                products GET    /products(.:format)                                                                               products#index
+                                 product GET    /products/:id(.:format)                                                                           products#show
+```
+
+These route prefixes give us helpers like the following:
+
+* `products_path` generates `"/products"`
+* `products_url` generates `"http://localhost:3000/products"`
+* `product_path(1)` generates `"/products/1"`
+* `product_url(1)` generates `"http://localhost:3000/products/1"`
+
+`_path` returns a relative path which the browser understands is for the current
+domain.
+
+`_url` returns a full URL including the protocol, host, and port.
+
+URL helpers are useful for rendering emails that will be viewed outside of the
+browser.
+
+Combined with the `link_to` helper, we can generate anchor tags and use the URL
+helper to do this cleanly in Ruby. `link_to` accepts the display content for the
+link (`product.name`) and the path or URL to link to for the `href` attribute
+(`product`).
+
+Let's refactor this to use these helpers:
+
+```erb {6}
+<h1>Products</h1>
+
+<div id="products">
+  <% @products.each do |product| %>
+    <div>
+      <%= link_to product.name, product_path(product.id) %>
+    </div>
+  <% end %>
+</div>
+```

src/content/tutorial/8-controllers/4-crud-show/content.md

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+{
+  "extends": "../../../../../templates/products-controller"
+}

src/content/tutorial/8-controllers/5-crud-create/_files/.tk-config.json

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+class ProductsController < ApplicationController
+  def index
+    @products = Product.all
+  end
+
+  def show
+    @product = Product.find(params[:id])
+  end
+end

src/content/tutorial/8-controllers/5-crud-create/_files/workspace/.keep

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+<h1>Products</h1>
+
+<div id="products">
+  <% @products.each do |product| %>
+    <div>
+      <%= link_to product.name, product_path(product.id) %>
+    </div>
+  <% end %>
+</div>