12.2 Iteration G2: Atom Feeds 11.6 Iteration F6: Testing AJAX changes
Create a model to contain orders
rails generate scaffold Order name:string address:text email:string pay_type:string
invoke active_record
create db/migrate/20111029071815_create_orders.rb
create app/models/order.rb
invoke test_unit
create test/unit/order_test.rb
create test/fixtures/orders.yml
route resources :orders
invoke scaffold_controller
create app/controllers/orders_controller.rb
invoke erb
create app/views/orders
create app/views/orders/index.html.erb
create app/views/orders/edit.html.erb
create app/views/orders/show.html.erb
create app/views/orders/new.html.erb
create app/views/orders/_form.html.erb
invoke test_unit
create test/functional/orders_controller_test.rb
invoke helper
create app/helpers/orders_helper.rb
invoke test_unit
create test/unit/helpers/orders_helper_test.rb
invoke assets
invoke coffee
create app/assets/javascripts/orders.js.coffee
invoke scss
create app/assets/stylesheets/orders.css.scss
invoke scss
identical app/assets/stylesheets/scaffolds.css.scss
Create a migration to add an order_id column to line_items
rails generate migration add_order_id_to_line_item order_id:integer
invoke active_record
create db/migrate/20111029071821_add_order_id_to_line_item.rb
Apply both migrations
rake db:migrate
mv 20111029071815_create_orders.rb 20110711000007_create_orders.rb
mv 20111029071821_add_order_id_to_line_item.rb 20110711000008_add_order_id_to_line_item.rb
== CreateOrders: migrating ===================================================
-- create_table(:orders)
-> 0.0552s
== CreateOrders: migrated (0.0552s) ==========================================
== AddOrderIdToLineItem: migrating ===========================================
-- add_column(:line_items, :order_id, :integer)
-> 0.0009s
== AddOrderIdToLineItem: migrated (0.0010s) ==================================
Add a Checkout button to the cart
edit app/views/carts/_cart.html.erb
<div class="cart_title">Your Cart</div>
<table>
<%= render(cart.line_items) %>
<tr class="total_line">
<td colspan="2">Total</td>
<td class="total_cell"><%= number_to_currency(cart.total_price) %></td>
</tr>
</table>
<%= button_to "Checkout", new_order_path, method: :get %>
<%= button_to 'Empty cart', cart, method: :delete,
confirm: 'Are you sure?' %>
Return a notice when checking out an empty cart
edit app/controllers/orders_controller.rb
def new
@cart = current_cart
if @cart.line_items.empty?
redirect_to store_url, notice: "Your cart is empty"
return
end
@order = Order.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: @order }
end
end
Modify tests to ensure that there is an item in the cart
edit test/functional/orders_controller_test.rb
test "requires item in cart" do
get :new
assert_redirected_to store_path
assert_equal flash[:notice], 'Your cart is empty'
end
test "should get new" do
cart = Cart.create
session[:cart_id] = cart.id
LineItem.create(cart: cart, product: products(:ruby))
get :new
assert_response :success
end
Modify the template for new orders
edit app/views/orders/new.html.erb
<div class="depot_form">
<fieldset>
<legend>Please Enter Your Details</legend>
<%= render 'form' %>
</fieldset>
</div>
Modify the partial used by the template
edit app/views/orders/_form.html.erb
<%= form_for(@order) do |f| %>
<% if @order.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@order.errors.count, "error") %>
prohibited this order from being saved:</h2>
<ul>
<% @order.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name, size: 40 %>
</div>
<div class="field">
<%= f.label :address %><br />
<%= f.text_area :address, rows: 3, cols: 40 %>
</div>
<div class="field">
<%= f.label :email %><br />
<%= f.email_field :email, size: 40 %>
</div>
<div class="field">
<%= f.label :pay_type %><br />
<%= f.select :pay_type, Order::PAYMENT_TYPES,
prompt: 'Select a payment method' %>
</div>
<div class="actions">
<%= f.submit 'Place Order' %>
</div>
<% end %>
Add payment types to the order
edit app/models/order.rb
class Order < ActiveRecord::Base
PAYMENT_TYPES = [ "Check", "Credit card", "Purchase order" ]
end
Add some CSS
edit app/assets/stylesheets/application.css.scss
.depot_form {
fieldset {
background: #efe;
legend {
color: #dfd;
background: #141;
font-family: sans-serif;
padding: 0.2em 1em;
}
}
form {
label {
width: 5em;
float: left;
text-align: right;
padding-top: 0.2em;
margin-right: 0.1em;
display: block;
}
select, textarea, input {
margin-left: 0.5em;
}
.submit {
margin-left: 4em;
}
br {
display: none
}
}
}
Validate name and pay_type
edit app/models/order.rb
class Order < ActiveRecord::Base
# ...
validates :name, :address, :email, presence: true
validates :pay_type, inclusion: PAYMENT_TYPES
end
Update the test data in the orders fixture
edit test/fixtures/orders.yml
# Read about fixtures at
# http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html
one:
name: Dave Thomas
address: MyText
email: dave@example.org
pay_type: Check
two:
name: MyString
address: MyText
email: MyString
pay_type: MyString
Move a line item from a cart to an order
edit test/fixtures/line_items.yml
# Read about fixtures at
# http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html
one:
product: ruby
order: one
two:
product: ruby
cart: one
Define a relationship from the line item to the order
edit app/models/line_item.rb
class LineItem < ActiveRecord::Base
belongs_to :order
belongs_to :product
belongs_to :cart
def total_price
product.price * quantity
end
end
Define a relationship from the order to the line item
edit app/models/order.rb
class Order < ActiveRecord::Base
has_many :line_items, dependent: :destroy
# ...
end
Add line item to order, destroy cart, and redisplay catalog page
edit app/controllers/orders_controller.rb
def create
@order = Order.new(params[:order])
@order.add_line_items_from_cart(current_cart)
respond_to do |format|
if @order.save
Cart.destroy(session[:cart_id])
session[:cart_id] = nil
format.html { redirect_to store_url, notice:
'Thank you for your order.' }
format.json { render json: @order, status: :created,
location: @order }
else
@cart = current_cart
format.html { render action: "new" }
format.json { render json: @order.errors,
status: :unprocessable_entity }
end
end
end
Implement add_line_items_from_cart
edit app/models/order.rb
class Order < ActiveRecord::Base
# ...
def add_line_items_from_cart(cart)
cart.line_items.each do |item|
item.cart_id = nil
line_items << item
end
end
end
Modify the test to reflect the new redirect
edit test/functional/orders_controller_test.rb
test "should create order" do
assert_difference('Order.count') do
post :create, order: @order.attributes
end
assert_redirected_to store_path
end
take a look at the validation errors
get /orders/new
post /orders
process an order
get /orders/new
post /orders
get http://localhost:3000/
Pragmatic Bookshelf
Thank you for your order.
CoffeeScript is JavaScript done right. It provides all of JavaScript's functionality wrapped in a cleaner, more succinct syntax. In the first book on this exciting new language, CoffeeScript guru Trevor Burnham shows you how to hold onto all the power and flexibility of JavaScript while writing clearer, cleaner, and safer code.
Ruby is the fastest growing and most exciting dynamic language out there. If you need to get working programs delivered fast, you should add Ruby to your toolbox.
Rails Test Prescriptions is a comprehensive guide to testing Rails applications, covering Test-Driven Development from both a theoretical perspective (why to test) and from a practical perspective (how to test effectively). It covers the core Rails testing tools and procedures for Rails 2 and Rails 3, and introduces popular add-ons, including Cucumber, Shoulda, Machinist, Mocha, and Rcov.
look at the underlying database
sqlite3> select * from orders
id = 1
name = Dave Thomas
address = 123 Main St
email = customer@example.com
pay_type = Check
created_at = 2011-10-29 07:18:31.119550
updated_at = 2011-10-29 07:18:31.119550
sqlite3> select * from line_items
id = 10
product_id = 2
cart_id =
created_at = 2011-10-29 07:17:19.943758
updated_at = 2011-10-29 07:18:31.122171
quantity = 1
price = 36
order_id = 1
hide the notice when adding items to the cart
edit app/views/line_items/create.js.erb
$("#notice").hide();
if ($('#cart tr').length == 1) { $('#cart').show('blind', 1000); }
$('#cart').html("<%=j render @cart %>");
$('#current_item').css({'background-color':'#88ff88'}).
animate({'background-color':'#114411'}, 1000);
12.2 Iteration G2: Atom Feeds 11.6 Iteration F6: Testing AJAX changes