Rails has always included a scaffold script that generates a default controller implementation for you. Unfortunately that generated controller is unnecessarily verbose. When we take over Rails projects from other...
...We prefer a different approach. We believe that among all the classes in a Rails project, controllers are some of the hardest to test and understand and should receive special...
The same applies to files in Carrierwave. Variant: Deliver attachments through Rails The first way is to store Paperclip attachments not in the default public/system, but in...
...can be configured like this: class Note < ActiveRecord::Base has_attached_file :attachment, :path => ":rails_root/storage/:rails_env/attachments/:id/:style/:basename.:extension" end To link to the protecting controller actions...
Accept: application/json This means the client will only understand JSON responses. When a Rails action is done, it will try to render a template for a format that the...
...pages/foo, application/foo with {:locale=>[:de], :formats=>[:json], :handlers=>[:erb, :builder, :haml]} This is because Rails tried to find a template like foo.js.erb but all it found was foo.html.haml (which the...
etag { current_user&.id } etag { current_user&.updated_at } end Under the hood, Rails generates an ETag header value like W/"f14ce3710a2a3187802cadc7e0c8ea99". In doing so, all objects from that...
...etag { current_user&.updated_at&.to_f } end You might even want to patch Rails' etagging logic so you don't have to remember doing that. Here you go:
content_type_1.match(/\Aimage\/(jpeg|png)\z/) # => nil content_type_2.match(/\Aimage\/(jpeg|png)\z/) # => Rails Newer Rails explicitly warns you, when you use ^ and $ in validations with a regular expression...
...of form.fields_for. You forgot to use accepts_nested_attributes in the containing model. Rails won't complain, but nothing will work. In particular, nested_form.object will be nil.
You are not setting the inverse_of for a has_many through association. Rails will then not be able to process a collection assignment, since it can't find...
Rails applications and ruby gems should have a README that gives the reader a quick overview of the project. Its size will vary as projects differ in complexity, but there...
...be written atop the class file. Structure I suggest the following outline for a Rails project's README, using the very readable Markdown language: # App title Describe the whole project...
...config/initializers/searchkick.rb (or wherever you have configured your Searchkick settings) add: SEARCHKICK_CLIENT_TYPE = case Rails.env when 'production', 'staging', 'development', 'test' :elasticsearch else :opensearch end Searchkick.client_type = ENV.fetch('SEARCHKICK_CLIENT_TYPE...
...SEARCHKICK_CLIENT_TYPE).to_sym ENV['OPENSEARCH_URL'] ||= case Rails.env when 'production' OPENSEARCH_PRODUCTION_SERVER when 'staging' OPENSEARCH_STAGING_SERVER else 'http://opensearch:9200' # docker container name end
...model validation that restricts its length. There are two motivations for this: In modern Rails, database types :string and :text no longer have a relevant size limit. Without a validation...
...malicious user can quickly exhaust the hard drive of your database server. In legacy Rails (or database schemas migrated from legacy Rails), database types :string and :text had a database...
end html end Full disclosure: Under the hood this uses the private Rails helper method split_paragraphs that simple_format uses. While it might break when upgrading Rails...
...load associated records if you know you need to access them later on. The Rails docs say: Eager loading is supported with polymorphic associations. This is true, but has some...
...and include their current versions' primary media... Page.includes(:current_version => :primary_medium).to_a ... Rails will produce 4 queries: Page Load (0.7ms) SELECT "pages".* FROM "pages" PageVersion Load...
...up releases, not assets. In order to clean up assets, you can use capistrano-rails. Just require 'capistrano/rails' in Capfile and add the following config: # config/deploy.rb set :keep_assets...
...remove any older versions. If you are using Webpacker, you need to configure capistrano-rails. If you are on Rails 3, you cannot use this to clean up assets. :keep...
Recent rails security updates have shown that people make incorrect assumptions about the possible contents of the params hash. Just don't make any! Treat it as what it is...
.../pages/edit?foo --> params == {:foo => nil} /pages/edit?foo[] --> params == {:foo => [nil]} # at least in older rails 3 and in rails 2.x Be especially wary about stuff like User.find_by_password...
...but give sub-classes a way to override values without affecting the parent class. Rails has many helpers for this such as class_attribute and class_inheritable_accessor. Unfortunately their...
...semantics are hard to understand, the helpers available differ for different versions of Rails and the behavior is subtly different. Make sure you read and understand the API before using...
...All you need is a pretty print-stylesheet. How to use it from your Rails application You can have PDFKit render a website by simply calling PDFKit.new('http://google.com').to...
...separately before calling to_file. Alternatively you can use PDFKit::Middleware and all your Rails routes automagically respond to the .pdf format. This is awesome to get started fast, but...
Note that when your app is a web app, the console running your rails server will pause the server and show the debugging console. Your browser will "hang" while...
If you need to debug code that is part of a gem like rails, just (temporarily) add a puts or debugger statement to its source files. Ruby is an...
...animation: none !important; } To only include these styles for tests, see Detect the current Rails environment from JavaScript or CSS. Disabling animations in Unpoly In Unpoly you can globally disable...
...argument('--disable-smooth-scrolling') Related cards Does or scroll the page? Detect the current Rails environment from JavaScript or CSS Disable concurrent AJAX requests in tests In applications that do...
...characters that have a particular meaning in URLs, like & or =. If you are using Rails URL helpers like movies_path(:query => ARBITRARY_STRING_HERE), Rails will take care of the...
/^([\w!#$%&'*+-/=?^`{|}~]+.)*[\w!#$%&'*+-/=?^`{|}~]+@((((([a-z0-9]{1}[a-z0-9-]{0,62}[a-z0-9]{1})|[a-z]).)+[a-z]{2...
gem 'super_diff' Require it in your spec_helper.rb require 'super_diff/rspec' # For Rails applications you can replace this with 'super_diff/rspec-rails' Customize colors in spec/support/super_diff.rb SuperDiff.configure do |config...
...contain exactly "XXX" ActiveRecord::Base is monkey patched by super_diff/rspec-rails (includes rspec and rails) super_diff/rails (includes active_record and active_support) super_diff/active_record This means that you have...
...to be released when the block ends. Example: RSpec::Mocks.with_temporary_scope do allow(Rails).to receive(:env).and_return('production'.inquiry) puts Rails.env # prints "production" end puts Rails.env # prints...
...at the same time have a .where on an included table, two things happen: Rails tries to load all involved records in a huge single query spanning multiple database tables...
activity.users.ids # here happens the unexpected # => [4] Workarounds Preload separately In newer Rails versions you should prefer to use joins and then preload if necessary (which will trigger a...
...the behavior, not the implementation" means. Resources Chapter "The value of tests" from Growing Rails Applications in Practice (in our library) Everyday Rails Testing with RSpec (in our library)
...Movie.search() and the new UI. Follow the advice from the "Testing" chapter from Growing Rails Applications in Practice: RSpec feature tests for the most common "happy path" RSpec unit tests...
Getting CSS (and JS) live reloading to work in a esbuild / Rails project is a bit of a hassle, but the following seems to work decently well. We assume that...
...you already use a standard "esbuild in Rails" setup, and have an esbuild watcher running that picks up your source code in app/assets and compiles to public/assets; if not change...