Olgagr

#to use this module the class has to mixin it and define <=> method

class Bid
  
  include Comparable
  attr_accessor :estimate
  
  def <=>(other_bid)
    if self.estimate > other_bid.estimate
      1

Olgagr

# to do it we have to define === method inside our class

class Ticket

  attr_accessor :venue, :date, :price
  
  def initialize(venue, date, price)
    self.venue = venue
    self.date = date
    self.price = price

Olgagr

# in application.rb
config.to_prepare do
  Devise::Mailer.layout "email_template" # in views/layouts
end

Olgagr

shared_examples('title of shared examples') do
  #some examples here
end

#then in a spec

describe 'something' do
  
  it_behaves_like 'title of shared examples'
  

Olgagr

# in spec_helper

RSpec.configure do |config| do
  
  #other code
  
  config.include FactoryGirl::Syntax::Methods
  
end

Olgagr

class FollowingRelationshipsController < ApplicationController

  def create
    current_user.follow user
    redirect_to user
  end
  
  def destroy
    current_user.unfollow user
    redirect_to user

Olgagr

class Timeline

  extend ActiveModel::Naming # it's better approach

  def initialize(user)
    @user = user
  end

  def to_partial_path
    'path/to/partial' # but there is a better way(see above)

Olgagr

# integration tests...some code

save_and_open_page

# integration tests...some code

Olgagr

# Lookahead assertion
str = "123 456. 789"
m = /\d+(?=\.)/.match(str) # m[0] = '456'. Period doesn't count as a part of the match
/\d+(?!\.)/ # negative lookahead


# Lookbehind assertion
str = "David BLACK"
m = /(?<=David )BLACK/ # only match BLACK if it's preceded by 'David'
/(?<!David) BLACK/ # negative lookbehind

Olgagr

str = 'abc def ghi'
m = /(abc) (?:def) (ghi)/.match str
# m[0] -> abc
# m[2] -> ghi