marshallshen

# Old way
hash = {
    "starts_at" => Date.today.to_s,
    "ends_at" => (Date.today + 2.days).to_s
}
# Alternative way
hash = {
   "starts_at" => Date.today,
   "ends_at" => Date.today + 2.days
}

marshallshen

cd .git/info/exclude
# add the file I want to exclude.

marshallshen

Spree::Product.all.each do |product|
  if product.id%2 == 0
    product.send(:update_attributes!, name: "casual female style")
    product.send(:update_attributes!, meta_description: "https://dl.dropbox.com/s/pufh630xex4t12b/original_female.jpg", meta_keywords: "https://dl.dropbox.com/s/oj2tw4mqyev4jab/female_styled.jpeg")
  else
    product.send(:update_attributes!, name: "casual male style")
    product.send(:update_attributes!, meta_description: "https://dl.dropbox.com/s/6639119teyh533i/original_male.jpeg", meta_keywords: "https://dl.dropbox.com/s/376mmsprv8w1oib/male_style.jpeg")
  end
end

marshallshen

Spree::Product.all.each do |p|
   p.update_attributes!(price: p.price+100)
end

marshallshen

dataset = []
w = 500
h = 400
padding = 30

dataset.push [ Math.random() * w, Math.random() * h ] for [0..50]

svg = d3.select("body")
        .append("svg")
        .attr("width", w)

marshallshen

# assume that we have Leiningen installed
mkdir project_name
mkdir project_name/src
 
# create project.clj
(defproject incanter-helloworld "0.1.0"
  :description "The Incanter version of hello world."
  :dependencies [[incanter "1.2.3-SNAPSHOT"]]
  :main hello)
 

marshallshen

(use 'incanter.core)

;; basic arithmetic
($= 7 + 8 - 2 * 6 / 2) ; => 9


;; add 5 to each element of the vector [1 2 3]
($= [1 2 3] + 5) ; => (6 7 8)

marshallshen

require 'csv'

module Exporter
  DEFAULT_EXPORT_TABLES = [ Invoice, InvoiceItem, Item, Merchant, Transaction, User ]
  DESTINATION_FOLDER = "tmp/"

  def self.included(klass)
    klass.extend ClassLevelMethods
  end

marshallshen

  def change
    create_table :users do |t|
      t.references :account #account_id
      t.references :profile #profile_id
      #...
    end

    add_index :accounts, [:account_id, :token], :unique => true, :name => 'by_account_token'
    add_index :accounts, :profile_id, :unique => true, :name => 'by_profile'
    add_index :accounts, [:account_id, :display_name],  :name => 'by_account_profile'

marshallshen

1.9.3p125 :018 > ""[0..1]
 => ""
1.9.3p125 :019 > ""[0]
 => nil