Olga Grabek Olgagr

Olgagr / Comparable.rb

Created May 26, 2013 08:26

Comparable module in Ruby

	#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 / case_statement_behaviour.rb

Created May 26, 2013 08:45

Defining case statement behaviour for Ruby class

	# 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 / devise_setup_email_layout.rb

Created May 28, 2013 18:54

Set up layout for email in Devise gem

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

Olgagr / rspec_shared_examples.rb

Created May 30, 2013 06:00

create shared examples in spec file

	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 / short_syntax_factory_girl.rb

Created June 2, 2013 07:09

shorter syntax for factory_girl

	# in spec_helper

	RSpec.configure do \|config\| do

	#other code

	config.include FactoryGirl::Syntax::Methods

	end

Olgagr / controller_private_setter_for_local_variable.rb

Created June 15, 2013 15:48

Controller private setter for local variable

	class FollowingRelationshipsController < ApplicationController

	def create
	current_user.follow user
	redirect_to user
	end

	def destroy
	current_user.unfollow user
	redirect_to user

Olgagr / set_partial_path_in_class.rb

Created June 15, 2013 16:43

Set partial path in the class which does not inherit fro active model

	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 / launchy_open_page.rb

Created June 23, 2013 14:35

Using launchy gem in integration tests

Olgagr / lookahead_lookbehind_assertions

Created July 14, 2013 15:57

Lookahead and Lookbehind Assertions

	# 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 / match_but_dont_capture

Created July 14, 2013 16:01

Construct to match something but don't count it as a capture