...to understand what middlewares in Rack are good for. Rack Start with these articles: Rails on Rack Introduction to Rack Middleware Short Screencast to a sample Middleware
...answer the following questions: What is Rack? How does Rack relate to Ruby on Rails? What is Rack middleware? What are some advantages of implementing functionality as a middleware as...
...t like an ActiveSupport::HasWithIndifferentAccess. There are also some issues if you are on Rails < 4.1 and want it to replace #to_json (but you can always just call Oj.dump...
What I did test successfully was the workaround below. Workaround In Rails 4 you can wrap the output of Oj.dump(...) in an escape_json tag to escape...
Rails comes with grouped_collection_select that appears to be useful, but isn't. As an alternative, consider the flat_grouped_collection_select found below. It takes a third argument...
...not doing this. Use form models or vanilla methods instead. The :conditions option for Rails associations cannot take a lambda. This makes it hard to define conditions that must be...
...a typo. It's to prevent Ruby from interpolating the string at compile time. Rails is aware of this hack and will perform interpolation at runtime. See this article for...
.../../../../../../../../../etc/passwd%%0000.html) Someone tries to exploit CVE-2019-5418. If you use the latest Rails (or latest Rails LTS) you're safe. The exact versions that fix this issue are...
...Rails 6.0.0.beta3, 5.2.2.1, 5.1.6.2, 5.0.7.2, 4.2.11.1, Rails LTS 3.2.22.13 and Rails LTS...
...like app/inputs/grouped_collection_select_input.rb (SimpleForm will pick it up automatically; if it does not, restart your Rails server) and use it in your form with that new :group_by option.
If you migrate a Rails application from Sprockets to Webpack(er), you can either transpile your CoffeeScript files to JavaScript or integrate a CoffeeScript compiler to your new process. This...
You will need to upgrade to RSpec >= 2 and rspec-rails >= 2 for Rails 3. Here are some hints to get started: In RSpec 2 the executable is rspec, not...
RSpec and rspec-rails have been completely refactored internally. All RSpec classes have been renamed from Spec::Something to RSpec::Something. This also means that every require 'spec/something' must...
Adding the asset cache directory to symlinked directories Popular asset managers for Rails are Sprockets and Webpacker. Both keep a cache of already compiled files that we're...
...For newer Ruby versions, use form_with_development_errors.rb. This monkey patches both form_for and form_with. Rails-XSS is required by default. So if your project doesn't support Rails-XSS...
...This is why we don't use "transactional fixtures" in our Cucumber tests, which Rails by default uses to clean up the database after each test. Instead we use DatabaseCleaner...
Spring is a Rails application preloader. When debugging e.g. the rails gem, you'll be wondering why your raise, puts or debugger debugging statements have no effect. That's because...
...you can only write environment variables that subprocesses will see. For tests with a Rails application (i.e., that call rails or rake or other binstubbed commands), this method may help...
...following project: ruby -v ruby 1.8.7 bundler -v Bundler version 1.13.7 gem -v 1.8.30 rails -v Rails 3.2.22.1 Running specs or features resulted in: uninitialized constant Gem::LOADED_SPECS_MUTEX...
...previous settings described in Maximum version of Rubygems and Bundler for Ruby 1.8.7 and Rails 2.3 (even the rails version was rails 3.2 and not 2.3) seems not to work...
...you already have stored files in the old structure) Checklist: Using Carrierwave in a Rails project
Expiration of Rails sessions By default Rails sessions expire when the user closes her browser window. To change this edit your config/initializers/session_store.rb like this: ActionController::Base.session = { :key => '...', :secret => '...' :expire_after...
} In older Railses the initializer is not available. Set the option in the environment.rb instead: config.action_controller.session = { :key => '...', :secret => '...' :expire_after => 10.years } Expiration of Rails cookies In addition to the...
...want something similar, so we define our own helper object: let :helper do Spec::Rails::Example::HelperExampleGroup::HelperObject.new.tap do |helper| helper.send :extend, LayoutHelper end end it 'should work' helper.title('Hello...
helper.instance_variable_get('@content_for_title').should == 'Hello World' end This applies to Rails 2. Maybe RSpec 2 / Rails 3 are smarter...
...page for more information on calculating sizes of databases or tables. Connect to a Rails database with bin/rails dbconsole -p...
...uses mocha. This note shows to use RSpec stubs and mocks instead. Rspec 1 / Rails 2 Put the following into your env.rb: require 'spec/stubs/cucumber' Rspec 2 / Rails 3
...or controller) logic. Here is how. Note: this has only been tested on a Rails 2 application. It should work similarly for Rails 3. Put this into your ApplicationController:
Now you can use with_full_urls in views, helpers or controllers and Rails methods like url_for will generate "full" URLs that have a protocol and hostname. You...
If you want to make your Rails application be capable of sending SMTP emails, check out the action mailer configuration section in the Ruby on Rails guide.
...in your environment or individually applied to an email generated in your mailer: # production.rb: Rails.application.configure do config.action_mailer.delivery_method = :smtp config.action_mailer.smtp_settings = smtp_settings end # test_mailer.rb def test_mail
Next, configure your application to use that middleware by putting this inside your Rails initializer block (config/environment.rb for Rails 2, config/application.rb for Rails 3): require 'lib/rack/cookie_stripper.rb' config.middleware.use Rack::CookieStripper...
You will get this when you are using the latest version of Rails with a recent version of Rack: SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
...future versions will even invalidate your existing user cookies. The warning is caused by Rails calling Rack incorrectly. It is unclear when this is going to be fixed in Rails...
After upgrading to Rails 6.1.7.2 one of our apps printed a wall of warnings while booting: /var/www/app/shared/bundle/ruby/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:68: warning: already initialized constant Net::ProtocRetryError /home/deploy-app/.rbenv/versions/2.6.10/lib/ruby/2.6.0/net/protocol.rb:66: warning: previous definition of...
...fixing errors as they occur: Update gems as listed below, and bundle Boot a Rails console - see below for a list of changes you will probably need Run Specs with...
...constraints as possible. Boot the application in different environements to spot further issues, e.g. rails console staging Gem updates Replace ruby-debug with byebug or pry Replace mysql with mysql2...