A couple of Railsconfs ago, Courtenay and I did indeed discuss
...got this error after upgrading Ruby from 2.4.5 to 2.6.4 when I opened the Rails console - rails server still worked. Running via Spring preloader in process 14679 Loading development environment...
Traceback (most recent call last): .../lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:175:in 'fork': No such file to load -- irb/encoding_aliases.rb (LoadError) .../lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:175:in 'fork': undefined method 'reject!' for nil:NilClass (NoMethodError) .../lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb...
...token authenticity" even if csrf token is present? As :domain => :all is set in Rails 3, local session cookies seem not to be set unless you specify a top-level...
Solutions Use a dns wildcard service like lvh.me and set :domain => 'lvh.me' if Rails.env.development? Then you can access your local server with lvh.me:3000 or anysubdomain.lvh.me:3000. Another way is, to...
...setting the :x_sendfile option to true. This option is activated by default for Rails 3, so you need to understand this. What this option does is not to send...
...as a new response header: X-Sendfile: /opt/www/awesome-project/shared/downloads/image.png When the response comes back from Rails to Apache for delivery, Apache will detect that header and replace the empty response body...
Plugins (and gems) are typically tested using a complete sample rails application that lives in the spec folder of the plugin. If your gem is supposed to work with multiple...
...versions of Rails, you might want to use to separate apps - one for each rails version. For best practice examples that give you full coverage with minimal repitition of code...
...exceptions, maybe some bot visits your site requesting silly formats like: http://www.rails-app.com/makandra.html-username-2000 # => Rails tries to retrieve 'makandra' with format 'html-username-2000' Just restrict accepted format parameters for...
...not_acceptable) end end end end Note: request.format more reliably tells the format, but includes Rails-required formats such as application/x-www-form-urlencoded (which we must not refuse). For our purposes, getting...
...not work with complex sorting constraints and may even silently create malformed SQL for rails < 5. Take a look at this query which orders by the maximum of two columns...
...SELECT "pages".* FROM "pages" ORDER BY GREATEST(pages.published_from_de, pages.published_from_en) DESC Rails 4 Rails 4 will not immediately raise but creates malformed SQL when trying to use...
You want Spring for super-fast binstubs like bin/rails or bin/rspec which avoid Rails boot time. You want parallel_tests to speed up full test runs of large test suites...
...not an issue for full test runs that take several minutes, we can accept Rails booting a few seconds. In your binstubs, there should be something like this: begin
...possible to access Rails config (for example secrets) from within your webpack bundles, thanks to rails-erb-loader. When using webpacker, the setup is like this: Install rails-erb-loader...
...yarn add rails-erb-loader Add this to your config/webpacker/environment.js: environment.loaders.prepend('erb', { test: /\.erb$/, enforce: 'pre', use: [{ loader: 'rails-erb-loader', }] }) Start using erb. For example, in a file api_config.js.erb...
...in development. This is usually useful, but when you run into issues with the Rails autoloader, you should take a look at what it's doing. For me this was...
...of auto-loading classes inside a thread which caused the application to stop responding. Rails 4.x ActiveSupport::Dependencies includes logging support. It is easy to use: ActiveSupport::Dependencies.logger = Rails.logger...
...locale/de/app.po for every locale you want to use use method "_" like _('text') in your rails code run rake gettext:find to let GetText find all translations used translate messages in...
...locales = [ 'en', 'de' ] FastGettext.add_text_domain('app', :path=>'locale', :type=>:po) FastGettext.text_domain = 'app' Rails::Initializer.run do |config| # Versionsnummern selber rausfinden: config.gem 'spreadsheet', :version => '=0.6.4.1' config.gem "fast_gettext", :version...
...Rubygems) it will provide the Jasmine library to your asset pipeline. When you then install rails-assets-jasmine-fixture through Rails Assets you will get another (possibly conflicting) copy of...
...Jasmine installed through Rails Assets. This is because rails-assets-jasmine-fixture depends on rails-assets-jasmine and does not realize that the Jasmine dependency was already satisfied through jasmine...
In Rails 2, you could use link_to_remote...
...:update => 'id' to...
...automatically replace the content of $('#id'). To do the same in Rails 3, include usual rails-ujs JavaScript, and put this into your application.js: $(function() { $('[data-remote][data-replace]')
Watch out when saying something like 1.year in Rails. The result is not a Fixnum and can cause unexpected errors when the receiving end expects a Fixnum. While anything from...
...seconds to months are Fixnums, a year is a Float in Rails -- when called on a Fixnum itself: >> 10.seconds.class => Fixnum >> 2.minutes.class => Fixnum >> 24.hours.class => Fixnum >> 28.days.class => Fixnum >> 9.months.class => Fixnum >> 1.year.class
Rails understands a :limit options when you create columns in a migration. Its meaning depends on the column type, and sometimes the supplied value. The documentation states that :limit sets...
In Rails 5 you can say: ApplicationController.render( :template => 'users/index', :layout => 'my_layout', :assigns => { users: @users } ) If a Request Environment is needed you can set attributes default attributes or initialize a...
...host: 'example.org', https: false ) renderer.render( :template => 'users/index', :layout => 'my_layout', :assigns => { users: @users } ) In Rails 3 and 4 you can say: ApplicationController.new.render_to_string( :template => 'users/index', :layout => 'my_layout',
Rails 5 (don't know about the others) comes with an initializer wrap_parameters.rb. Here you can tell rails to wrap parameters send to your controllers for specific formats into a...
...used to when you are dealing with form payloads. This is especially handy because Rails puts some stuff in the params which does not really belong there IMHO. For instance...
ActiveRecord has a feature called counter caching where the containing record in a has_many relationship caches the number of its children. E.g. when you have House has...
...many :rooms, Rails can cache the number of rooms in House#rooms_count. Mind that when a model has a column that looks to Rails like a counter-cache column...
...you need to, probably your whole application should be split up. Split it anyway Rails::Engine looks at config.paths['config/routes.rb'] and registers its value with app.routes_reloader. This means you...
...then require them. However, I recommend to put any routing files into config/routes/: # config/routes/example.rb Rails.application.routes.draw do resources :example end After creating your routing files, tell Rails how to find them...
Rails 3.0 has been underway for a good two years, so it’s with immense pleasure that we can declare it’s finally here. We’ve brought the work of...
Learn everything you need to know about Scaling your Rails app through 13 informative Screencasts produced by Gregg Pollack with the support of New Relic...
There are a bunch of basic functional elements to building out a popular Rails app that I've never really seen explained in one place, but we had to learn...
A thorough introduction to web development with Ruby on Rails
bower-rails is a great solution for managing vendored assets in your Rails app. It feels especially much more convenient and easier to update assets when going this way.
...rails generates a Bowerfile that works much like the Gemfile you're used to. Just specify your dependencies and run rake bower:install. You can find available packages here.