delba

require 'test_helper'

class AnswerTest < ActiveSupport::TestCase
  def setup
    Answer.before_save do
      instance_variable_set :@first_callback, true
    end
    
    @answer = Answer.create!
  end

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require 'test_helper'

class QuestionTest < ActiveSupport::TestCase
  include ActionView::Helpers::TranslationHelper
  
  test "title is required" do
    question = Question.new.tap(&:valid?)
    assert_includes question.errors[:title],
      t('errors.messages.blank')
  end

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module FloatDivision
  refine Fixnum do
    def /(other)
      self.to_f / other
    end
  end
end

using FloatDivision

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class Song < ActiveRecord::Base
  def length=(length)
    return unless length =~ /\A\d+:\d{2}\z/
    minutes, seconds = length.split(':').map(&:to_i)
    write_attribute(:length, minutes * 60 + seconds)
  end
  
  def length
    return unless length = read_attribute(:length)
    "%02d:%02d" % length.divmod(60)

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class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :username
      t.string :email
      t.string :password_digest

      t.index :username, unique: true
      t.index :email, unique: true

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class User < ActiveRecord::Base

  before_save(if: :username_changed?) { username.downcase! }
  before_save 'username.downcase!', if: :username_changed?
  before_save ->{ username.downcase! }, if: :username_changed?
  
end

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class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  
private

  def signed_in?
    !!session[:user_id]
  end
  helper_method :signed_in?

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Time.now.strftime("%I:%M%p") #=> "09:06PM"
Time.now.strftime("%H:%M")   #=> "21:06"

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# config/initializers/contraints.rb

module Constraints
  class Subdomain
    def self.matches?(request)
      request.subdomain.present? && request.subdomain != 'www'
    end
  end
  
  class SignedIn

delba

module FormHelper
  def login_form
    find('#new_session')
  end
end