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  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  @Column(name = "id", nullable = false)
  private Long id;
  
  @Enumerated(EnumType.STRING)
  @Column(name = "deliveryChannel", nullable = false)
  private EDeliveryChannel deliveryChannel;
  
  @Temporal(TemporalType.TIMESTAMP)

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//outout Hex 0x30 0xf2 0x08....
printf(" %02x", p[i]);
printf("\n");


//表示byte 指针时，都用unsigned char

zhuliangyu

rails g rspec:install

create a rspect for controller
rails g rspec:controller passwords
create a rspect for model
rails g rspec:model widget



rails g factory_girl:model Car name speed:integer

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 def destroy
    # render plain:"asd"

    comment_id=params[:id]

    @comment=Comment.find(comment_id)
    @idea=@comment.idea


    if can? :delete, @comment

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class Ability
  include CanCan::Ability

  def initialize(user)

    user ||= User.new

    can :like, Idea do |idea|
      idea.user!=user
    end

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var express=require('express');
var app=express();

app.get('/',function (req, res) {
   res.send('asddas');
});

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#application controller

  def authenticate_user
    redirect_to new_session_path, alert: 'please sign in' unless user_signed_in?
  end

  def user_signed_in?
    session[:user_id].present?
  end
  helper_method :user_signed_in? # adding this line makes this mehtod accessible

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当我们要扩展类的方法时，我们可以采取Mixin的方式将模块中的方法添加到类中，下面会对实现的几种方式进行详细介绍：

1. include和extend

使用include，可以将模块中定义的方法作为实例方法添加到类中；使用extend，可以将模块中定义的方法作为类方法添加到类中。
下面的例子是include的使用方法。
[ruby] view plain copy
module MyMod  
  def method  
  end  

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require "data_mapper"

DataMapper.setup(:default, "sqlite://#{Dir.pwd}/app.db")

# class name must be singular. DataMapper will user a pluralized name for the
# table. For instance, in this case it will be `contacts`
class Contact
  # this integrates our class with DataMapper so it will do things like creating
  # or updating the table and columns inside the table. It will also give us
  # extra methods to interact with table rows.

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require "sinatra"
require "sinatra/reloader"

get "/" do
  erb :index
  erb (:index,{layout: :default_layout})

end

# get params from url