nthj

module AccessibleBlock
  extend ActiveSupport::Concern

  module ClassMethods

    @accessible_block = false
    def key(*arguments, &block)
      super
      attr_accessible arguments[0] if @accessible_block
    end

nthj

class ApplicationController < ActionController::Base
  extend Filterable

  after_update -> { user.clear_cache! }
end

nthj

class String
  def questionable
    questionable? ? to_s : "#{to_s}?"
  end
  
  def questionable!
    replace questionable
  end
  
  def questionable?

nthj

# Easily add id and class attributes to HAML elements
# 
# %li{ account.element.to_hash } ->
# <li class='account' id='account-7'>
#
# %span{ account.element.button.to_hash } ->
# <span class='account-button' id='account-7-button'>
#
# %span{ :class => account.element.save.button.class } ->
# <span class='account-save-button'>

nthj

# This isn't mine
# I can't remember where I found it, but mad props to whoever created it

class Hash
  def filter
    result = self.map do |k, v|
      r = yield v
      [k, r]
    end
    Hash[*result.flatten]

nthj

# constituent_importer.rb
# 
# When the customer uploads an Excel file, 
# we generate a unique ID for the file and 
# store it on our AWS/S3 jobs bucket.
#
# Then we create a job with that unique ID, 
# and our background workers execute the job as follows

class ConstituentImporter < Struct.new(:job_object_id)

nthj

# In a MongoMapper::Document, 
# simply add 
# key :password, Password
# your password will be automatically hashed,
# and you can compare plain-text passwords with the user's hashed password, ruby style:
# User.first.password == '1234'
# => true
#
# Also, prevents passwords from being leaked onto the console or error messages:
# User.first.password

nthj

module Railings
  module Filterable
    [:after, :before].each do |context|
      [:index, :show, :new, :create, :update, :destroy].each do |action|
        define_method "#{context}_#{action}", ->(filter, options = { }, &block) do
          send "#{context}_filter", filter, options.merge!(:only => action), &block
        end
      end
    end
  end

nthj

# if "key" equals "bird.jpg", 
# then this code creates a smaller thumbnail of the bird, 
# sized to 270 by 167 pixels, 
# adding a watermark, 
# compressing the thumbnail to save space, 
# and saving the new thumbnail as "bird_medium.jpg"
Original.find(key).compress(70).resize(270, 167).to(:fit).watermark.save(:medium)

nthj

# n = number of additional customers per period
# p = amount each customer is charged per period
# a = duration of period to calculate total gross for
# 
# example: customer every 2 weeks, 25 per month, after 6 months: (fn).call(2, 25, 6)
# => 1050
->(n, p, a) { t = 0; a.times { |i| t += (i + 1) * p * n }; t }