Basic git commands
This is for people recovering from Subversion.
Get an existing from the server for the first time
git clone git@example.com:repositoryname
See what's changed
git status
Check in locally
git commit -m "good description"
Push local commits to the server
git push
Get and merge updates from the server
git pull
Stage a file for the next local commit
git add file
Stage all files for the next local commit
git add .
Create a new local branch and check it out
git checkout -b branchname
...
Use the ALT key in a VirtualBox Windows VM
In Ubuntu your ALT key is locked when you're working in VirtualBox. There are two workarounds for this:
- Press the Windows key in addition to the ALT key
- Run the attached registry file and restart Windows. Your left Windows key is now the ALT key.
- If you'd like to map keys differently, here are further instructions
Order of the state_machine callback chain
- before transition
- before validation
- after validation
- before save
- after save
- after transition
Aborting the callback chain
How to fix "Too many authentic authentication failures" with SSH and/or Capistrano
You are getting when connecting via SSH or deploying with Capistrano (which uses SSH):
Too many authentication failures for username
This is caused by having too many SSH keys added to your keyring or ssh-agent. Your ssh-agent will throw all keys against a server until one matches. Most servers will deny access after 5 attempts.
This issue might come and go as the order of the active SSH keys in your ssh-agent changes.
Quick fix
Have less keys. Up to 5 keys are fine when the SSHD you're connecting to is using the default ...
Why your all.js is empty on staging or production
When you include a non-existing Javascript file, you probably won't notice it during development. But with caching active (on production or staging) Rails will write an empty all.js file without complaining.
Slugs with FriendlyId
Gem to provide nice looking urls ("/blog/the-greatest-bug-i-never-fixed"). If you don't need anything too special (like i18n for the urls) it works as a drop-in-replacement. It basically overwrites #to_param to return the slug, and .find to search by the slug.
Make sure, everywhere you build paths, you use model_path(:id => model) instead of model_path(:id => model.id). You also need to adapt all code using something like .find_by_id. The regular .find is fine.
See the github README for installation instructions.
Don't forget ...
Copy a Paperclip attachment to another record
Just assign the existing attachment to another record:
new_photo = Photo.new
new_photo.image = old_photo.image
Paperclip will duplicate the file when saving.
To use this in forms, pimp your attachment container like this:
class Photo < ActiveRecord::Base
has_attached_file :image
attr_accessor :copy_of
def image_url
if copy_of
copy_of.url
else
image.url
end
end
end
And in the controller do:
new_photo = Photo.new(:copy_of => old_photo)
Force absolute URLs in views throughout a response
This is more tricky than it should be because url_for, asset_path, etc. all rely on different mechanisms.
Anyway, you can use the attached trait like this:
class ExampleController < ApplicationController
does 'host_enforcement', :for => 'some_action'
end
Short explanation:
-
asset_hostis used for links to stylesheets and javascripts -
asset_hostbelongs toActionController::Base-- changes are persistent and will not be reset after a request -
rewrite_optionsis used by the..._pathmethods in the views
^...
Unobtrusive JavaScript and AJAX
Attached (see below) is some code to allow using unobtrusive JavaScript on pages fetched with an AJAX call.
After you included it, you now do not use the usual
$(function() {
$('.some_tag').activateStuff();
});
any more, but instead you write
$.unobtrusive(function() {
$(this).find('.some_tag').activateStuff();
});
that is
-
$.unobtrusive()instead of$() - don't do stuff to the whole page, but just to elements nested below
$(this)
Normal pages work as before (your $.unobtrusive functions are ca...
Javascript Compressor - compress code online for free
Compress and obfuscate Javascript code online completely free using this compressor.
Highlighted prompt for production shells
Insert into ~/.bashrc and reload afterwards: source ~/.bashrc
PS1='${debian_chroot:+($debian_chroot)}\[\033[41;33m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
Apple iPhone Water Damage
Below are 12 easy steps to follow if you're iPhone has experienced water damage.
RubySpec - The Standard You Trust
RubySpec is a project to write a complete, executable specification for the Ruby programming language.
stefankroes's ancestry at master - GitHub
Ancestry is a gem/plugin that allows the records of a Ruby on Rails ActiveRecord model to be organised as a tree structure (or hierarchy). It uses a single, intuitively formatted database column, using a variation on the materialised path pattern. It exposes all the standard tree structure relations (ancestors, parent, root, children, siblings, descendants) and all of them can be fetched in a single sql query. Additional features are STI support, named_scopes, depth caching, depth constraints, easy migration from older plugins/gems, integrit...
Rethinking Rails 3 Controllers and Routes | Free PeepCode Blog
The Rails router has been written and rewritten at least four times2, including a recent rewrite for the upcoming Rails 3. The syntax is now more concise.<br />
<br />
But never mind making it shorter! It’s time for a final rewrite: Let’s get rid of it altogether!
Announcing the jQuery Mobile Project | jQuery Mobile
The jQuery project is really excited to announce the work that we’ve been doing to bring jQuery to mobile devices. Not only is the core jQuery library being improved to work across all of the major mobile platforms, but we’re also working to release a complete, unified, mobile UI framework.
Mule Design Studio’s Blog: Tips On Buying Design
You’re a business, calling a business, about conducting business. Don’t be surprised when money comes up.
Selling your software in China « Successful Software
The first thing I need to say, right off the bat: Chinese users will not buy your software. Period. That does not mean that there is no money to be made, it simply means that they will not pay for your software license.
Interoperability Happens - Death to Best Practices
Computer science is about tradeoffs and hard choices. Optimizing the code or design or architecture one way means taking hits another way.
jbarnette's johnson at master - GitHub
Johnson wraps JavaScript in a loving Ruby embrace. It embeds the Mozilla SpiderMonkey JavaScript runtime as a C extension.
mynyml's holygrail at master - GitHub
The Holy Grail of testing for front-end development; execute browser-less, console-based, javascript + DOM code right from within your Rails test suite.