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require 'erb'
require 'ostruct'

# ====================
# 0. Helper
# ====================

def render_file(text, variables)
  struct = OpenStruct.new(variables)
  rendered_file = ERB.new(text).result(struct.instance_eval { binding })

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#
# CORS header support
#
# One way to use this is by placing it into a file called "cors_support"
# under your Nginx configuration directory and placing the following
# statement inside your **location** block(s):
#
#   include cors_support;
#
# As of Nginx 1.7.5, add_header supports an "always" parameter which

graysonchen

#!/usr/bin/env bash
####################################################################################
# Slack Bash console script for sending messages.
####################################################################################
# Installation
#    $ sudo curl -Ls http://dlj.bz/MCZmsa --output /usr/bin/slack
#    $ sudo chmod +x /usr/bin/slack
####################################################################################
# USAGE
# Send message to slack channel/user

graysonchen

Raspberry Pi VPN Router

This is a quick-and-dirty guide to setting up a Raspberry Pi as a "router on a stick" to PrivateInternetAccess VPN.

Requirements

Install Raspbian Jessie (2016-05-27-raspbian-jessie.img) to your Pi's sdcard.

Use the Raspberry Pi Configuration tool or sudo raspi-config to:

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#!/usr/bin/env bash

# Check for Homebrew, install if we don't have it
if test ! $(which brew); then
  echo "Installing homebrew..."
  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
fi

# Update homebrew recipes
# brew update

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See question on stack overflow: http://stackoverflow.com/questions/28595636/rails-4-how-to-give-alias-names-to-includes-and-joins-in-active-record-que

- Model Student and model Teacher are both STI models with super class model User
- Model Story is a STI model with super class model Task
- includes() and joins(), both fails

Rails alias naming convention (includes() and joins())

- One model as parameter
  - is base model (includes(:users))

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# 在本地服务器建立 rubygems.org 的镜像缓存，以提高 gem 的安装速度
# 此配置设置缓存过期为1天，也就是说，新上的 gem 无法马上安装
# 做这个起什么作用？
# rubygems 的很多资源文件是存放到 Amazon S3 上面的，由于 GFW 对某些 S3 服务器又连接重置或丢包，导致 gem 安装异常缓慢或有时候根本无法连接安装。
# 而通过这种跳板的方式可以很好的解决这个问题，当然前提是 Nginx反向代理 服务器需要在国外

proxy_cache_path  /var/cache/rubygems  levels=1:2    keys_zone=RUBYGEMS:10m
                                       inactive=24h  max_size=1g;
server {
  listen 80;

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# autoload concerns
module YourApp
  class Application < Rails::Application
    config.autoload_paths += %W(
      #{config.root}/app/controllers/concerns
      #{config.root}/app/models/concerns
    )
  end
end

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http://www.zhlwish.com/2012/07/23/rails-activesupport-concern/

# autoload concerns
module YourApp
  class Application < Rails::Application
    # config.autoload_paths += %W(
    #     #{config.root}/app/controllers/concerns/
    #      #{config.root}/app/models/concerns/
    #   )

graysonchen

#!/bin/bash
rm -rf api.rubyonrails.org/
wget -r -k -p http://api.rubyonrails.org/
rm rails_api.rar
rar a -r rails_api.rar api.rubyonrails.org/