Alexis Mansilla Ruiz alexismansilla

Polymorphic Associations reversed

It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media

This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

The current kernel/drivers of Fedora 24 do not support the Wifi chip used on my Mac Book Pro. Proprietary Broadcom drivers are packaged and available in the rpmfusion repo.

Verify that your card is a Broadcom using: lspci -vnn -d 14e4:

Sample output:

02:00.0 Network controller [0280]: Broadcom Corporation BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03)

Install

Install the rpmfusion repo, note only "nonfree" is required, as the Broadcom Driver is proprietry: http://rpmfusion.org/

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
	click_link('Link Text')
	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

	#############################################
	# Push de la rama actual
	git push origin $rama_actual

	#############################################
	# Volver a un commit anterior, descartando los cambios
	git reset --HARD $SHA1

	#############################################
	# Ver y descargar Ramas remotas

	class Array
	def pluck key
	map { \|hash\| hash[key] }
	end
	end

	[{:number => "1"}, {:number => "2"}, {:number => "3"}].pluck(:number)
	# => ["1", "2", "3"]

	# you have ctags but it does not work...
	$ ctags -R --exclude=.git --exclude=log *
	ctags: illegal option -- R
	usage: ctags [-BFadtuwvx] [-f tagsfile] file ...

	#you need to get new ctags, i recommend homebrew but anything will work
	$ brew install ctags

	#alias ctags if you used homebrew
	$ alias ctags="`brew --prefix`/bin/ctags"


	# update
	sudo yum -y update
	sudo yum -y upgrade

	# enable EPEL6 by changing enabled=0 -> enabled=1
	sudo vim /etc/yum.repos.d/epel.repo

	# install htop
	sudo yum install htop

	# ...

	gem 'carrierwave'
	gem 'fog', '~> 1.0.0' # Need to specify version, as carrierwave references older (0.9.0) which doesn't allow configuration of Rackspace UK Auth URL

	# This is a skeleton for testing models including examples of validations, callbacks,
	# scopes, instance & class methods, associations, and more.
	# Pick and choose what you want, as all models don't NEED to be tested at this depth.
	#
	# I'm always eager to hear new tips & suggestions as I'm still new to testing,
	# so if you have any, please share!
	#
	# @kyletcarlson
	#
	# This skeleton also assumes you're using the following gems: