Change the db with migrations on the fly

What if you want to add a column though the console with one line of code? (and you exactly know what this implies)

ActiveRecord::Migration.new.add_column :payments, :card_verification, :string, limit: 8
ActiveRecord::Migration.new.execute "full sql here"

Coffescript rendering

The correct way to render html inside your XHR response in Rails.

  app.showFlashMessages('<%=j flash_messages %>')
  $('.booking').replaceWith( '<%=j render @booking %>' )
  app.myFunction( <%=raw array.map(&:to_json) %> ) # TODO: double check

backtrace_silencers to clean the development log from missing assets

# /config/initializers/backtrace_silencers.rb
Rails.backtrace_cleaner.add_silencer { |line| line =~ /lib\/action_dispatch\/middleware\/static.rb/ } if Rails.env.development?

This simple line will clean up your development log to something like this:

[FTL] 
ActionController::RoutingError (No route matches [GET] "/assets/ecoologic/rooms/room_tb.png"):
  actionpack (3.2.5) lib/action_dispatch/middleware/static.rb:62:in `call'

This is only in development (or test?) as you usually don't use the static middleware in staging or production.

mysql cheatsheet

# Print the query result into a file
mysql> select * into outfile '/tmp/new.txt' from users;

# show the current database
mysql> select database();

useful links

• less shitty internet explorer
• Ruby Quick Tips
• jquery vector map
• syntax highlighter
• google analytics and adwords webinars
• HTML5 support
• teach events
• Sublime Text 2 and Ruby on Rails screencast 
• Rspec info
• Capybara matchers
• CDN

get out of the filter bubble

Google personalizes the results of your query and so do many others. In Google this can be avoided adding

&pws=0

to the end of your search URL in the search bar. Useful for SEO.

Disclaimer: You can't get out of all of the filters bubble.

define class methods in ruby (private too)

The following syntax could be used for defining the find method itself, but it is mandatory for alias.

class Item
  def self.find(name)
    # ...
  end

  class << self
    alias :search :find
  end

  private_class_method :find # writing it below private is not enough
end