The Rails asset pipeline improves delivery of application assets (javascripts, stylesheets, images, fonts). Here are some basic facts about its inner workings. No magic Manifests are the handle on your...
...results. You can do this locally using the following commands: rake assets:precompile # precompiles to Rails.root/public/assets rake assets:clobber # deletes the public/assets directory After precompilation, you can check the...
...entirely find out why, and we eventually did not care). This happened on a Rails 3.2 application and is likely to happen on Rails 4 applications as well. Your best...
If Rails or Rake are complaining about a missing gem that is listed in your Gemfile.lock and the listed version is properly installed, something is seriously wrong and needs to...
...seeing the gems it needs. Remove those wrong and unneccesary directories and Rake and Rails will boot again. To avoid this in the future, make sure everybody installs gems on...
You may disable multi-line autocomplete by using the --nomultiline commandline switch (for Rails, use bin/rails console -- --nomultiline), or specifying IRB.conf[:USE_MULTILINE] = false in your ~/.irbrc.
...migration_user.phone ) end end end Now the best idea is to test this in the rails sandbox (so your development data stay untouched): rails console --sandbox 2.4.1 :003 > DataMigration.new.run
...more unreadable to more attributes you delegate. Alternative to def_delegators When working with Rails, use delegate...
...:to =>...
class Post < ActiveRecord::Base belongs_to :topic delegate :title, :category, :to...
end Looks a lot like the above def_delegators call but behaves differently. Rails does not provide a pretty solution to this, but simply write a method for it...
...part is a bit lengthy, but it allows you to debug strange bugs with Rails autoloading the wrong constants. Due to the constant lookup rules above, Rails sometimes guesses wrong...
...in development and production, but the problem exist for both environment. Development During development, Rails unloads all classes after every request. This way code changes take effect immediately, without requiring...
Firefox 5.0.1, which we were using for most Rails 2.3 projects, does not run on Ubuntu 14.04 any more. Here is how to update affected projects. Update (or create) .firefox...
...run tests with Geordi, it will tell you how to install it. On a Rails 2 project: Update your Cucumber-related gems as described in Upgrading Cucumber and Capybara, including...
...print, if present requires interactive_editor, if present (basically makes vim available) loads .irbrc_rails if in Rails (e.g. for the Rails console) .irbrc_rails defines efind(email), which is...
...to find users by email requires hirb, if present set the prompt to your Rails app's name Of course you can put anything into these files...
...all styling inline, which means you'll have to do your styling inline. For Rails applications, you can use Roadie or premailer, which lets you keep your well-structured CSS...
...passive maintenance mode, we go with premailer: Include premailer in your Gemfile: gem 'premailer-rails' In your ApplicationMailer define the mailer layout: layout 'mailer' To get the mailer stylesheet (and...
Ubuntu 12.04 LTS x64, Ruby 1.8.7, Rails 2.13, PDFKit 0.5.4, Phusion Passenger Apache 2 I ran into this, when I started using passenger to deal with the Single Thread Issue...
...wkhtmltopdf-amd64 /usr/local/bin/wkhtmltopdf sudo chmod +x /usr/local/bin/wkhtmltopdf Tell PDFKit where to find your wkhtmltopdf: Rails::Initializer.run do |config| require "pdfkit" config.middleware.use PDFKit::Middleware PDFKit.configure do |config| config.wkhtmltopdf = '/usr/local/bin/wkhtmltopdf' # <-- the fix...
...and The...
...field should have the error...
...steps now have built-in support for Rails and Bootstrap (v3-v5) error classes. When using Bootstrap, it is no longer necessary to...
...behaves like an unordered Hash, but is much faster. Info If you're using Rails you already have concurrent-ruby in your bundle. hamster hamster provides several collection classes, such...
...following helper. def greeting message = ''.html_safe message << 'Welcome to ' message << content_tag(:span, Rails.env, class: 'greeting--location') content_tag :div, message, class: 'greeting' end That looks clumsy and is...
...say something like this? def greeting render_haml <<-HAML .greeting Welcome to %span.greeting--location = Rails.env HAML end It would be, and you can have it, too. You simply need to...
...like to split a Ruby array into pairs of two, you can use the Rails ActiveSupport method in_groups_of: >> [1, 2, 3, 4].in_groups_of...
...split a Ruby array into a given number of groups, you can use the Rails ActiveSupport method in_groups: >> [1, 2, 3, 4, 5, 6].in_groups...
There is a practical short list for valid/invalid example email addresses - Thanks to Florian L.! The definition for valid emails...
...to append filepaths to it. With this method, Ruby code can look like this: Rails.root/"features"/"fixtures"/"picture.jpg" Alternatively you can use the #join method, which feels less magic: Rails.root.join...
There are different ways to run rake: On Rails 4.1+ projects, you have Spring and its binstubs which dramatically improve boot-up time for Rake and similar. You need to...
rake is a function rake () ... Next, try running rake routes on a Rails 4.1+ project -- the 2nd time should be significantly faster. On older projects you should always...
...the need to enter user and password, you can say the following in any Rails 2 project: script/dbconsole -p In Rails 3 you can say: rails dbconsole -p
Provide a stable API for working with scopes across multiple versions of Rails, since Rails has a tradition of breaking details of its scope API every other release...
DETAIL: There is 1 other session using the database. This could be the rails server, rubymine and many more. Beside terminating the session connection manually you can also find...
...out the pid and kill the process. 1. rails db 2. SELECT * FROM pg_stat_activity; datid | 98359 datname | foo_development pid | 21633 usesysid | 16384 usename | username application_name | DataGrip...
I got this error when running Rails 2.3 tests for Rails LTS. More stacktrace: NoMethodError: undefined method `cache' for Gem:Module /vagrant/rails-2-3-lts-repository/railties/lib/rails_generator/lookup.rb:212:in `each' /vagrant/rails-2-3-lts-repository/railties/lib/rails_generator/lookup.rb:146:in `to_a...
...scenario, the code below lets you write this: Given my IP address is 188.174.117.205 Rails 3 Given /^my IP address is "(.*?)"$/ do |ip| ActionDispatch::Request.any_instance.stub(:remote_ip).and_return(ip...
Rails 2 You will need the following step definitions: Given /^my IP address is (\d+\.\d+\.\d+\.\d+)$/ do |ip| ApplicationController.stubbed_request_ip = ip end After do ApplicationController.stubbed_request...
...up 20160517112656 Migrate pages to page versions up 20160518112023 ********** NO FILE ********** When you tell Rails to roll back, it tries to roll back the latest change that was migrated. In...
...have the corresponding migration file for. Hence, it can not be rolled back and Rails aborts silently. This happens for example when you migrated on the master branch at some...