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/20120212173003_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/20120212173010_add_order_id_to_line_item.rb
Apply both migrations
rake db:migrate
mv 20120212173003_create_orders.rb 20110711000007_create_orders.rb
mv 20120212173010_add_order_id_to_line_item.rb 20110711000008_add_order_id_to_line_item.rb
== CreateOrders: migrating ===================================================
-- create_table(:orders)
-> 0.0112s
== CreateOrders: migrated (0.0112s) ==========================================
== AddOrderIdToLineItem: migrating ===========================================
-- add_column(:line_items, :order_id, :integer)
-> 0.0016s
== AddOrderIdToLineItem: migrated (0.0018s) ==================================
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/
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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 = 2012-02-12 17:30:19.970113
updated_at = 2012-02-12 17:30:19.970113
sqlite3> select * from line_items
id = 10
product_id = 2
cart_id =
created_at = 2012-02-12 17:28:55.477112
updated_at = 2012-02-12 17:30:19.976623
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