Starting from 4.1, Rails automatically detects the inverse of an association, based on heuristics. Unfortunately, it does not seem to notify you when it fails to infer the :inverse_of...
Rails' params hash contains any request parameters (URL parameters or request payload) as well as routing parameters like :controller, :action, or :id. To access only URL parameters, use request.query_parameters...
Rails 5 will introduce ActiveRecord::Relation#or. On Rails 4 and 3.2 you can use the activerecord_any_of gem which seems to be free of ugly hacks and nicely...
In FactoryBot factories, Rails' file_fixture is not available by default. To enable it, include a support module from rspec-rails: FactoryBot::SyntaxRunner.include(RSpec::Rails::FileFixtureSupport) That includes ActiveSupport::Testing...
After starting the Rails server in a freshly generated Rails 3.1 project you could see an error message such as /usr/lib/ruby/gems/1.8/gems/execjs-1.3.0/lib/execjs/runtimes.rb:50:in `autodetect': Could not find a JavaScript runtime...
Don't write resources :people, :concerns => :trashable Write resources :people do concerns :trashable end Why Writing a controller...
Put the following into config.ru in your Rails root folder: # Require your environment file to bootstrap Rails require ::File.dirname(__FILE__) + '/config/environment' # Dispatch the request run ActionController::Dispatcher.new Otherwise, your Rails...
In specs, the session never persists but is always a new object for each request. Data put into the session...
When using form_for you can give the form's target URL either as a string or an array:
You might find that your Passenger ignores all RailsSomething directives in the vhost for your new Rails 3 application. The culprit is a file config.ru which makes Passenger consider your...
...application a Rack (non-Rails) application. To fix this you can either use RackEnv in lieu of RailsEnv (it works fine) or delete the config.ru. Unless you have a good...
Rails 2.3.16+ on Ruby 1.9 causes warnings like this: .../gems/activesupport-2.3.17/lib/active_support/core_ext/string/output_safety.rb:22: warning: regexp match /.../n against to UTF-8 string Many thanks to grosser for supplying a monkey-patch for...
...Rails 2.3 (Commit f93e3f0ec3 fixed it for Rails 3). Just put it into config/initializers/ to make those warnings go away. Since we're using RSpec on most projects, I've...
Today I learned that Ruby on Rails has shipped with a built-in slug generator since Rails 2.2: > "What Up Dog".parameterize => "what-up-dog" > "foo/bar".parameterize => "foo-bar"
Rails’ reputation as a relatively secure Web framework is well deserved. Out-of-the-box, there is protection against many common attacks: cross site scripting (XSS), cross site request forgery...
...the default behavior could be more secure. This post explores potential security issues in Rails 3 that are fixed in Rails 4, as well as some that are still risky...
The Ruby on Rails security list archive can be found here: http://groups.google.com/group/rubyonrails-security You can subscribe to this mailing list without a Google account by pasting this URL into...
Rails 4 introduced raising an error on pending migrations. This is most annoying when you are crafting a migration but need to play with your application to figure out how...
After switching to Rails 3 you may get a LoadError with the following message when trying to use your application via passenger: no such file to load -- dispatcher Your Passenger...
...RVM on a Mac and cannot enter 8+ bit characters on an IRB or Rails console, you are missing the readline package. You will need to re-install your Ruby...
January has been a very bad month for Ruby on Rails developers, with two high-severity security bugs permitting remote code execution found in the framework and a separate-but...
...related compromise on rubygems.org, a community resource which virtually all Ruby on Rails developers sit downstream of. Many startups use Ruby on Rails. Other startups don’t but, like the...
...root_url, :data => { :foo => 'bar', :bam => 'baz' } This will produce: Label Only works in Rails 3. In Rails 2 you do = link_to 'Label', root_url, 'data-foo' => 'bar', 'data...
We're adding a script console-for to open a remote Rails console with one command. Also have a look at shell-for, which this script is relying on.
This card needs to be updated for Rails 3+. Since there is no --debugger flag you need to run: rdebug script/runner lib/scripts/something.rb That will open an debugging IRB right away...
Let's say you need to revert a migration that happened a while back. You'd create a new migration...
Yesterday, there was a blog post entitled “What the Hell is Happening to Rails” that stayed at the number one spot on Hacker News for quite a while. The post...
...the comments on the post reflect deep-seated concern about the recent direction of Rails. Others have addressed the core question about change in the framework, but I’d like...
...a dump from db/production_structure.sql: class LoadDump < ActiveRecord::Migration def up config = YAML.load_file('config/database.yml')[RAILS_ENV].symbolize_keys config[:flags] = Mysql2::Client::MULTI_STATEMENTS client = Mysql2::Client.new(config) sql = File.read...