在上次的内容里,我们实现了清空购物车和金额的格式化处理。这次实现订单的模块。
1.首先,我们要在数据库里创建Order表,创建表的Sql如下:
create table orders (id int not null auto_increment,name varchar(100) not null,email varchar(255) not null,address text not null,pay_type char(10) not null,primary key (id));
我们还要重新创建line_item表,下面是Sql:
create table line_items (id int not null auto_increment,product_id int not null,order_id int not null,quantity int not null default 0,unit_price decimal(10,2) not null,constraint fk_items_product foreign key (product_id) references products(id),constraint fk_items_order foreign key (order_id) references orders(id),primary key (id));
在InstantRail里,可以使用phpMyAdmin来执行Sql。
运行命令行,生成Order的Model,如图:
1.下面要修改rails_apps/depot/app/models目录下的order.rb和line_item.rb文件:
class Order < ActiveRecord::Basehas_many :line_itemsPAYMENT_TYPES = [[ "Check", "check" ],[ "Credit Card", "cc" ],[ "Purchase Order", "po" ]].freezeendclass LineItem < ActiveRecord::Basebelongs_to :productbelongs_to :orderdef self.for_product(product) self.new item = self.new item.quantity = 1 item.product = product item.unit_price = product.price itemendend
可以看出,上面的修改其实就是给Order和LineItem之间添加了主从关系。
2.给sTore_controller添加代码:
def checkout@cart = find_cart@items = @cart.itemsif @items.empty?redirect_to_index("There's nothing in your cart!")else@order = Order.newendend
3.现在Model和Controller都有了,下面要作什么已经很明显了,当然是添加一个View了,在rails_apps/depot/app/views/sTore目录下创建checkout.rhtml文件,内容为:
<% @page_title = "Checkout" -%><%= start_form_tag(:action => "save_order") %> <table> <tr> <td>Name:</td> <td><%= text_field("order", "name", "size" => 40 ) %></td> </tr> <tr> <td>EMail:</td> <td><%= text_field("order", "email", "size" => 40 ) %></td> </tr> <tr valign="top"> <td>Address:</td> <td><%= text_area("order", "address", "cols" => 40, "rows" => 5) %></td> </tr> <tr> <td>Pay using:</td> <td><%= ptions = [["Select a payment option", ""]] + Order::PAYMENT_TYPES select("order", "pay_type", options) %></td> </tr> <tr> <td></td> <td><%= submit_tag(" CHECKOUT ") %></td> </tr> </table><%= end_form_tag %>
4.这时候,如果打开Checkout页面的话,会显示错误页面,少了什么呢?我们还需要在order.rb文件中添加代码:
PAYMENT_TYPES = [ [ "Check", "check" ], [ "Credit Card", "cc" ], [ "Purchase Order", "po" ] ].freeze
好了,大功告成,来看看效果吧,如图:
现在点击CHECKOUT按钮,会转到Rails的一个错误页面,提示“Unknown action”。下次我们实现这个功能。
幸福就是重复。每天跟自己喜欢的人一起,通电话,