top Also see: How to get a rough picture about a Rails project How to examine an unknown Ruby object

task :script, roles: :app, only: { primary: true } do run "cd #{current_path} && RAILS_ENV=#{rails_env} bundle exec rails runner 'ScriptRunner.go'" end becomes desc 'Run script'

on primary :app do within current_path do with rails_env: fetch(:rails_env, 'production') do execute :bundle, 'exec', "rails runner 'ScriptRunner.go'" end end end end

encoding: utf8 username: root password: secret Note if you're on an old Rails version If you're using a Rails version less than 3.1 (e.g. 2.3.x...

...Newer versions no longer include the ActiveRecord adapter (which is part of ActiveRecord since Rails .1). So your Gemfile should say:

...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

...add ANSI color annotations (which your console then interprets). To print a log (e.g. rails log) and color all lines containing "FATAL" in red and all lines with "INFO" in...

You have to specify the environment with -e env_name or RAILS_ENV=env_name if you want to run a script on the server. at Rails 2 it's...

bundle exec script/runner -e env_name path/to/script.rb argument1 argument2 ... at Rails 3 it's rails runner RAILS_ENV=env_name bundle exec rails runner path/to/script.rb argument1 argument2...

User.active.to_sql Rails 2 Use either the Edge Rider or fake_arel gem to get #to_sql backported to Rails 2. If you don't want to use...

...a gem for this, you can do this with vanilla Rails 2: User.active.construct_finder_sql...

...block where you define replacements (as you already know). This issue applies to both Rails 2 (with rails_xss) as well as Rails 3 applications. Here is a fix to...

...html_safe.gsub(/(f)/) { puts $1; 'b' } f => "boo" Why? This is because of the way rails_xss implements "unsafe" methods: # vendor/plugins/rails_xss/lib/rails_xss/string_ext.rb UNSAFE_STRING_METHODS = [ ..., "gsub",...

for unsafe_method in UNSAFE...

...Commit using a story title from Pivotal Tracker geordi con[sole] [TARGET] # Open a Rails console locally or on a Capistrano deploy target geordi cu[cumber] [FILES] # Run Cucumber features...

...PATH # Optimize .png files geordi ra[ke] TASK # Run a rake task in several Rails environments geordi re[move-executable-flags] # Remove executable-flags from files that should not be...

...port and the username (default root) and password (default msandbox). When working on a Rails project, you need to paste all of that into your config/database.yml. Connecting to a sandbox...

...only of a single javascript file, so it does not trigger additional requests with rails it automagically provides user feedback by selecting the text it has copied it provides callbacks...

...modes like copying from a text field or from a data attribute How to (rails) Add clipboard.js to your project through bower or by downloading and adding the javascript file...

...only want to compile when needed. This card shows what will cause Webpacker (the Rails/Webpack integration) to compile your assets. When you run a dev server While development it is...

...call any helper that accesses asset paths (e.g. javascript_pack_tag or image_tag), Rails will compile your entire assets within its process before that helper returns. This will cause...

Rails has the handy controller method send_file which lets us download files easily. We can decide whether the file should be downloaded (disposition: 'attachment') or shown in the browser...

If you are using Angular and want something like Rails' simple_format which HTML-formats a plain-text input into paragraphs and line breaks, this directive is for you.

...class DynamicStylesheetsController < ApplicationController def show logical_path = RELATIVE_PATH_TO_YOUR_TEMPLATE path = File.join(Rails.root, logical_path) template = Sass::Rails::SassTemplate.new(path) environment = YourApp::Application.assets context = environment.context_class.new(environment, logical_path...

...these helper methods to your ApplicationController: class ApplicationController < ActionController::Base private def integration_test? Rails.env.test? && defined?(Cucumber::Rails) end def observable_redirect_to(url) if integration_test? render :text => "If...

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...

Issue: You have an app using jsbundling-rails and esbuild. After deploy, the assets built by esbuild are missing in public/assets. Solution: Add app/builds to your git repo (by adding...

To reload a single-item association in Rails 5+, call #reload_ : post.reload_author In older Railses you can say post.author(true...

...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...

...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...