...dependent: :restrict_with_error before_destroy do subscriptions.destroy_all end end When account.destroy runs, Rails fires every restrict_with_error check first. If any scope returns at least one row...
...But dependent: :destroy and dependent: :restrict_with_error both install before_destroy callbacks, and Rails fires them in declaration order. If :destroy runs first, it wipes out the very rows...
...a has_many, has_one or belongs_to association, the :inverse_of option in Rails tells ActiveRecord that they're two sides of the same association. Example with a has...
...to :forum, inverse_of: :posts end Knowing the other side of the same association Rails can optimize object loading so forum and forum.posts[0].forum will reference the same object...
Rails 7.1 added a new method Rails.env.local?. If you want to stub the Rails env correctly, use ActiveSupport::EnvironmentInquirer like this: # check if the value of stubbed_env is valid...
...allow(Rails).to receive(:env).and_return(ActiveSupport::EnvironmentInquirer.new(stubbed_env.to_s...
All columns of a model's database table are automagically available through accessors on the Active Record object.
Add gem 'database_cleaner' to your Gemfile. Then: Cucumber & Rails 3+ # features/support/database_cleaner.rb DatabaseCleaner.clean_with(:deletion) # clean once, now DatabaseCleaner.strategy = :transaction Cucumber::Rails::Database.javascript_strategy = :deletion Cucumber & Rails 2
...available cucumber-rails for Rails 2 automatically uses database_cleaner when cucumber/rails/active_record is required -- but only if transactional fixtures are off. To have database_cleaner work correctly: Add the attached...
Rails is our web framework. Goals Be able to write a simple Rails application. Understand how Rails talks to the database (ActiveRecord) What is a model? How are records retrieved...
...has_many, has_many :through Gain an understanding of the structure of a basic Rails app Routes Controllers Generate a controller using Rails scaffolding Write your own controller Views
...find out which parts of your application are not tested. Integrating this in a rails project with rspec, cucumber and parallel_tests is easy. Add it to your Gemfile and...
...gem 'simplecov', require: false end Add a .simplecov file in your project root: SimpleCov.start 'rails' do # any custom configs like groups and filters can be here at a central place...
class World < ApplicationRecord; end class World::Earth < ApplicationRecord; end Without any further configuration, Rails will produce the following database table names. >> World.table_name => "worlds" >> World::Earth.table_name => "world_earths...
Rails supports time zones, but there are several pitfalls. Most importantly because Time.now and Time.current are completely different things and code from gems might use one or the other.
...only about one time zone is a bit tricky. The following was tested on Rails 5.1 but should apply to Rails 4.2 as well. Using only local time
...written as a Ruby Gem and was tested and evaluated against one Ruby on Rails project. This card will summarize and present the research results, the evaluation and the programmed...
...The tool should be suitable for modern web based development workflows with Ruby on Rails. Criteria Faster results of failing tests than random prioritization to lower regression testing costs.
...from various browser extensions of your visitors. Add the endpoint in you CSP config/initializers/content_security_policy.rb: Rails.application.configure do config.content_security_policy do |policy| # Settings for the policy policy.report_uri '/content_security_policy_report' end
class ContentSecurityPolicyReportsController < ApplicationController skip_forgery_protection def create if request.content_type == 'application/csp-report' Rails.logger.info("Content Security Policy Report: #{request.user_agent} #{request.body.read}") head :ok else head :bad_request end
Rails has generic error messages you can define in your locale .yml files. You may override those application-wide error messages using model or attribute scope like this: en: activerecord...
This card will teach you how to index, search and rank your Rails models in a PostgreSQL full-text index. We will do this without using any gems...
tl;dr Prefer request specs over end-to-end tests (Capybara) to joyfully test file downloads! Why? Testing file downloads
...Basics and Previews Chapter "Task H1: Sending Confirmation Emails" from Agile Web Development with Rails (in our library) Ensure that the receiving e-mail is valid Using the Truemail gem...
Ensure that development and staging are not sending out e-mails by accident Rails: How to write custom email interceptors Check if you have a local mail server listening...
Why Rails has multiple schema formats When you run migrations, Rails will write your current database schema into db/schema.rb. This file allows to reset the database schema without running migrations...
...by running rails db:schema:load. The schema.rb DSL can serialize most common schema properties like tables, columns or indexes. It cannot serialize more advanced database features, like views, procedures...
...is included in migrations by default (also see How to write complex migrations in Rails). Handy methods Note that both keys and values are always strings, i.e. you'll need...
Rails wraps your parameters into an interface called StrongParameters. In most cases, your form submits your data in a nested structure which goes hand in hand with the strong parameters...
...expect/permit/require when passing them to e.g. ActiveRecord. Note that expect is only available from Rails 8. There are cases where it might be fine to read directly, like: # Okay
...response time of a notoriously slow JSON API endpoint that was backed by a Rails application. While every existing app will have different performance bottlenecks and optimizing them is a...
The data flow examined in this card are based on an example barebone rails app, which can be used to reproduce the results. I tried to mimic the case...
It is very common to parse dates from strings. It seems obvious to use Date.parse for this job. However this...
Rails default config uses the ActiveSupport::Cache::NullStore and disables controller caching for all environments except production: config.action_controller.perform_caching = false config.cache_store = :null_store If you want to test caching...
path end end RSpec.configure do |config| config.include CachingHelpers end 3. Now stub the Rails cache and clear it before each example: RSpec.describe SomeClass let(:file_cache) { ActiveSupport::Cache.lookup_store...
TL;DR: Rails ships two methods to convert strings to constants, constantize and safe_constantize. Neither is safe for untrusted user input. Before you call either method you must validate...
...w[User Post Test]) if class_name class_name.safe_constantize.new # either User, Post or Test else Rails.logger.error "This should not happen!" end Handling unresolvable constants The safe_constantize method is defined in...
While working on a Rails application, your code base will grow a collection of different file types including: Ruby (business logic) HTML fragments (layouts and views) CSS/Sass/SCSS (styles) JavaScript (client...
...files which are often summed up as assets. You might already have noticed that Rails modifies those assets before delivering them to the client. For example, you'll never see...
Concurrent counter increments are a race-condition trap. The Rails idiom (load the record, increment in Ruby, save) breaks under concurrent writes. Between the read and the write, another transaction...