Thibaut Barrère thbar

belongs_to:

Assigning an object to a belongs_to association does not automatically save the object. It does not save the associated object either.

has_one:

When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
In addition, any object being replaced is also automatically saved, because its foreign key will change too
If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
If the parent object (the one declaring the has_one association) is unsaved (that is, new_record? returns true) then the child objects are not saved. They will automatically when the parent object is saved.

Sublime Text 2 regex replacement

To use the sass-rails image-url helper for background images after upgrading a project to Rails 4

Howto

Find regex

  url\(\/assets\/(.*)\)

Unfollow everyone on twitter.com

By @foldleft.bsky.social, see also Unfollow everyone on bsky.app.

Go to https://twitter.com/YOUR_USER_NAME/following
Open the Developer Console. (COMMAND+ALT+I on Mac)
Paste this into the Developer Console and run it

// Unfollow everyone on twitter.com, by Jamie Mason (https://twitter.com/fold_left)

One can use MD5 or plain text diff to see differences in PDF files. If that's not enough, here's how to use diff-pdf which knows how to diff based on appearance or words:

brew install diff-pdf
edit your ~/.gitconfig to add this:

[difftool "diffpdf"]
  cmd = diff-pdf --view \"$LOCAL\" \"$REMOTE\"

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	# Path of LibreOffice installation
	cd /Applications/LibreOffice.app/Contents/MacOS

	# General command
	./soffice --headless --convert-to <extension> <path+file>

	# Automatically convert all .odt files to pdf
	./soffice --headless --convert-to pdf ~/Downloads/*.odt

	# To specify an output folder you can add the --outdir option

	// Requires jQuery of course.
	$(document).ready(function() {
	$('.show-comments').on('click', function(){
	var disqus_shortname = 'YOUR-DISQUS-USERNAME'; // Replace this value with your username.

	// ajax request to load the disqus javascript
	$.ajax({
	type: "GET",
	url: "http://" + disqus_shortname + ".disqus.com/embed.js",
	dataType: "script",

	# Signal catching
	def shut_down
	puts "\nShutting down gracefully..."
	sleep 1
	end

	puts "I have PID #{Process.pid}"

	# Trap ^C
	Signal.trap("INT") {

	defmodule XmlNode do
	require Record
	Record.defrecord :xmlAttribute, Record.extract(:xmlAttribute, from_lib: "xmerl/include/xmerl.hrl")
	Record.defrecord :xmlText, Record.extract(:xmlText, from_lib: "xmerl/include/xmerl.hrl")

	def from_string(xml_string, options \\ [quiet: true]) do
	{doc, []} =
	xml_string
	\|> :binary.bin_to_list
	\|> :xmerl_scan.string(options)

	function git_diff_pdf {
	git difftool --no-prompt --tool=diffpdf $1
	}