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class PostsController < ActionController::Base
  def create
    Post.create(post_params)
  end
  
  def update
    Post.find(params[:id]).update_attributes!(post_params)
  end

  private

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>> require 'bigdecimal'
=> true
>> require 'bigdecimal/util'
=> true

>> BigDecimal('40.30') == 40.3
=> true
>> BigDecimal('40.90') == 40.9
=> true
>> BigDecimal('40.10') == 40.1

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#! /usr/bin/env ruby
str = $stdin.read
if RUBY_VERSION < '1.9'
  print str
  exit
end

str.force_encoding 'utf-8'
str.gsub! /(\p{Han})([a-zA-Z0-9\(\)\[\]\{\}])/u do
  "#$1 #$2"

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Here is a list of scopes to use in Sublime Text 2 snippets - 

ActionScript: source.actionscript.2
AppleScript: source.applescript
ASP: source.asp
Batch FIle: source.dosbatch
C#: source.cs
C++: source.c++
Clojure: source.clojure
CoffeeScript: source.coffee

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Routes

小心地使用 Match（Rails 3 已实现）

Rails 3 提供了 match 方法供我们自定义 routes，然而我们要小心使用它以避免“跨站脚本攻击”（XSS Attack）。比如像这样的 routes：

注：（r3 代表 Rails 3，r4 代表 Rails 4）

# routes.rb

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class ApiLogger < Grape::Middleware::Base
  
  def before
    Rails.logger.info "[api] Requested: #{request_log_data.to_json}\n" +
     "[api] #{response_log_data[:description]} #{response_log_data[:source_file]}:#{response_log_data[:source_line]}"
  end
  
private

  def request_log_data

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module Todo
  class API < Grape::API
    use Rack::Session::Cookie
    version 'v1', :format => :json
    
    helpers do
      def current_user
        return nil if env['rack.session'][:user_id].nil?
        @current_user ||= User.get(env['rack.session'][:user_id])
      end

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#
# Wide-open CORS config for nginx
#
location / {

     if ($request_method = 'OPTIONS') {

        add_header 'Access-Control-Allow-Origin' '*';
        
        #

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types {
  # other mime types...

  application/json          json;
}

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善用 define_method

define_method 可以帮助我们动态的，快速的定义多个方法；比如有这样一个类：

class Post
  attr_accessor :title, :content, :state

  def initialize(title, content, state = :draft)
    @title, @content, @state = title, content, state