ruby on rails(十) 订单处置
订单处置，首先要有一个订单的详细列表（包括数量，价钱啥的）和一个对于个人的一些信息的一个表。因而我们创造两个模型，line_item(列表项),order(列表)，其后编者如次
/db/migrate xxx_create_order xxx_line_item
Ruby代码
一.class CreateOrders < ActiveRecord::Migration
二.def self.up
3. create_table :orders do |t|
4. t.string :name
5. t.text :address
6. t.string :email
7. t.string :pay_type, :limit => 十
8. t.timestamps
9. end
十.end
11.
12.def self.down
13. drop_table :orders
14.end
15.d
class CreateOrders < ActiveRecord::Migration
def self.up
create_table :orders do |t|
t.string :name
t.text :address
t.string :email
t.string :pay_type, :limit => 十
t.timestamps
end
end
def self.down
drop_table :orders
end
end
Ruby代码
1. class CreateLineItems < ActiveRecord::Migration
二.def self.up
3. create_table :line_items do |t|
4. t.integer :product_id, :null => false,:options =>
5. "CONSTRAINT fk_line_items_products REFERENCES products(id)"
6. t.integer :order_id,:null => false, :options =>
7. "CONSTRAINT fk_line_items_orders ReEFERENCES orders(id)"
8. t.integer :quantity, :null => false
9. t.decimal :total_price, :null => false,:precision => 八,:scale => 二
10. t.timestamps
11. end
12.end
13.
14.def self.down
15. drop_table :line_items
16.end
17.d
class CreateLineItems < ActiveRecord::Migration
def self.up
create_table :line_items do |t|
t.integer :product_id, :null => false,:options =>
"CONSTRAINT fk_line_items_products REFERENCES products(id)"
t.integer :order_id,:null => false, :options =>
"CONSTRAINT fk_line_items_orders ReEFERENCES orders(id)"
t.integer :quantity, :null => false
t.decimal :total_price, :null => false,:precision => 八,:scale => 二
t.timestamps
end
end
def self.down
drop_table :line_items
end
end
t.integer :product_id, :null => false,:options =>
"CONSTRAINT fk_line_items_products REFERENCES p
相关文档：
1、文件的打开与关闭
``r'' Read-only, starts at beginning of file (default mode).
``r+'' Read-write, starts at beginning of file.
``w'' Write-only, truncates existing file to zero length or creates a new file for writing. ......
Ruby 101：方法对象
Written by Allen Lee
从方法调用说起
在上一篇文章里，我们看到调用对象的方法实质上是向对象发送消息，下面，我们再来看一个有趣的应用。在Ruby里，字典可以通过 {key => value} 来创建，如果你使用的版本是1.9或以上，当key的类型是Symbol时，创建字典的� ......
过程如下：
1、ruby下载一键安装：
http://rubyforge.org/frs/download.php/29263/ruby186-26.exe
ruby -v 显示版本，安装成功
2、下载rubygems安装：
http://rubyforge.org/frs/download.php/60719/rubygems-1.3.5.zip
解压，ruby setup.rb
gem -v 显示版本，安装成功
3、下载rails的 gem 安装（gem install ......
#include < ruby.h > //
static int id_sum;
int Values[] = {5, 10 ,15,-1,20,0};
static VALUE wrap_sum(VALUE args)
{
VALUE * values = (VALUE *) args;
VALUE summer = values[0];
VALUE max = values[1];
return rb_funcall(summer,id_sum,1,max);
}
static VALUE ......
