If you have any class which requires access to some path methods generated by your routes. Even though you could...
You've been there: A form cannot be submitted, but you don't see a validation error because the field...
Rails doesn't know which host it is running on. For generating links, it strips the hostname off the request...
After updating Rubygems you see a wall of deprecation warnings like this: NOTE: Gem::SourceIndex#add_spec is deprecated, use...
Sometimes the Rails helper #distance_of_time_in_words is using too much magic. When you need a time difference...
Detecting if a Javascript is running under Selenium WebDriver is super-painful. It's much easier to detect the current...
Hint: There's another card with this helper for Cucumber features. Sometimes you feel like you need to stub some...
tl;dr: Always have your attachment path start with :rails_root/storage/#{Rails.env}#{ENV['RAILS_TEST_NUMBER']}/. The directory where you...
When you need to create a locale for a language variant (like Austrian for German), you probably don't want...
When you need to use diff in either some Ruby code or your Rails app, use the differ gem.
Code example for implementing Cross-Origin Resource Sharing (CORS) in Rails.
To offer files for download, use send_file. def download(file) send_file file.path, :disposition => 'attachment' end
Passenger gives you the possibility to define in which environment your app should be started. This has to be added...
The Javascript code below is a rough equivalent to the simple_format helper that ships with Rails: function simpleFormat(str...
Resque comes with its own dashboard (Resque server) that you can mount inside your Rails 3 application with #config/routes.rb:
Note: If you are currently working with Ruby 1.8.7 or 1.9.3, we recommend to upgrade to Ruby 2.1 first. From...
This note describes how to kick a user out of a Rails application after she hasn't requested an action...
When you create a temporary file (e.g. to store a generated Excel sheet) and try to send it to the...
In Rails 2, you could use link_to_remote...
...:update => 'id' to automatically replace the content of $('#id').
Free Hoptoad/Airbrake alternative which can capture exceptions from any platform. It comes with a Rails notifier and a RESTful API...
This finally works: User.any_instance.should_receive(...) as does User.any_instance.stub(...) Note: You won't have RSpec 2.6 if you're still working...
Note that this card is very old. You might want to use ActiveType for your auto-coerced virtual attributes instead...
Leads to awesomeness and unicorns when used in production.
We are changing our name from Hoptoad to Airbrake. You see, some folks much larger than us reached out and...