By default, Rails' validates_uniqueness_of does not consider "username" and "USERNAME" to be a collision. If you use MySQL this will lead to issues, since string comparisons are case...
...may fail with an SQL error due to duplicate index key. You can change Rails' behaviour, by saying class User < ActiveRecord::Base validates_uniqueness_of :name, case_sensitive: false
...few examples, where you configure some library via a block. One example is the Rails configuration: Rails.application.configure do |config| config.enable_reloading = false end This card describes a simple example on...
...You can use ActiveSupport::Configurable instead of the Configuration class. When you are using Rails with Zeitwerk and the code for e.g. FooClient lives in a folder, that is loaded...
...reuse your existing factories instead of using the UI or creating records in the Rails console. This approach saves time and gives you useful defaults and associations right out of...
You can use FactoryBot directly in the Rails console like this: require 'factory_bot_rails' # Not needed if the factory_bot_rails gem is in the :development group...
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...
Rails Active Support provides some helpful methods for calculating times and dates, like Duration#ago or Duration#from_now. But beware when using those, because they wont give...
...timezone unaware. Moreover, you have to be aware that ActiveSupport::TimeWithZone does not use Rails.application.config.active_record.default_timezone, which you need to define, even if you only use your local timezone, but...
In Rails, we usually have a mailer setup like this: class MyMailer < ActionMailer::Base def newsletter mail to: 'receiver@host.tld', from: 'sender@host.tld', subject: 'My mail' end end If you want to...
mail = MyMailer.newsletter File.open('my_mail.eml', 'w') { |file| file.write(mail.to_s) } Now, close the rails console and preview the mail: xdg-open my_mail.eml There is not much magic in this...
# Redis db#1 is used for development. db_number = 1 if rails_env == 'test' normalized_test_number = [ENV['TEST_ENV_NUMBER'].to_i, 1].max db_number += normalized...
end db_number end def port case rails_env when 'staging' # when 'production' # else 6379 # default Redis port end end def rails_env defined?(Rails) ? Rails.env : ENV['RAILS...
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...
In modern Rails versions you can also use ActiveRecord's pluck method. User.active.pluck(:id) => [1, 5, 23, 42] If you are plucking from the id column in particular you can...
...not the resulting array). Article.distinct.pluck(:state) # SELECT DISTINCT state FROM articles => ['draft', 'published'] In Rails 3 and 4 you must use uniq instead of distinct: Article.uniq.pluck(:state) # SELECT DISTINCT state...
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:
...point over a separate ClassMethods module inside of your module. If you are using Rails (or only ActiveSupport), you may also use ActiveSupport::Concern which facilitates this for you.
...taken in chronological order, you get this: Singleton class Class Included modules Superclass(es) Rails 5 introduced prepended modules which allow you to patch methods in a class in a...
...already shipping as custom elements For example Trix from Basecamp (integrated as ActionText in Rails 6). By choosing custom elements as their delivery method, they work in all JavaScript frameworks...
...alotting time. This is a refactoring similar to removing resource_controller (but not a Rails upgrade). Grep for $. This will show you all the affected lines of code. Refactor functions...
Zeitwerk is the new autoloader of Rails. It is mandatory starting with Rails 7.0. Sometimes, a model needs to know all its descendants. They might be organized in a subdirectory...
...needs to iterate all design subclasses. To eager load all designs, use this line: Rails.autoloaders.main.eager_load_dir(Rails.root.join 'app/models/design') Make sure that app/models/design.rb is not required manually before instructing Rails...
...you're done, check your changes by running rake routes. handle_unverified_request When Rails gets a request with wrong/missing CSRF-Token, it calls ApplicationController#handle_unverified_request and continues...
...processing the request!. Per default, the method only resets the Rails session, but since Clearance doesn't store its session there, you should delete the remember_token cookie. With Clearance...
While most Rails Apps are tied to at least one external REST API, machine-to-machine communication via GraphQL is less commonly seen. In this card, I'd like to...
...w[errors]) unless response.status.ok? parsed_response end def client headers = { 'Content-Type' => 'application/json', 'Authorization' => Rails.application.secrets.fetch(:linear_api_key), } HTTP.headers(headers) end end Writing data (Mutation) Performing GraphQL mutations is equally...
...creation if you're on a POSIX system. If you are using Ruby on Rails, a use case / implementation might look like Rails 3: Sending tempfiles for download.
Rails 6 includes a WYSIWYG editor, Action Text. It works out of the box quite well, but chances are that you want to add some custom functionality. This card contains...
...some tips how to achieve this. Setup Basically, follow the guide in the Rails documentation. The automated script may not work with the way webpacker is configured in your project...
...users.map { |user| [user.id, user.name] }.to_h { 1 => "Alice", 2 => "Bob" } Enumerable#index_by (any Rails version) users = User.all users_by_id = users.index_by(&:id) { 1 => #<User id: 1, name: "Alice...
...User id: 1, name: "Alice">], "Bob" => [#<User id: 2, name: "Bob">] } Enumerable#index_with (Rails 6+) To generate a hash where array elements become hash keys, and values are calculated...
...app/models/test.rb index eg3c1k1..843c0a2 31143 --- app/models/test.rb +++ app/models/test.rb @@ -19,6 +19,10 @@ module RoutingFilter path = Rails.root / 'app' + if true + + end + return path (1/1) Discard this hunk from worktree [y,n,q...
...your application perform with lots of data? Generate many records per table. Watch the Rails logs and query_diet to find areas of improvement. Reduce N+1 queries, preload associations...
...some cases, a viable workaround is to turn your images into inline attachments. Note Rails provides a simple mechanism to achieve this: https://guides.rubyonrails.org/action_mailer_basics.html#making-inline-attachments This documentation makes it look...
...It is recommended to watch for a feature flag, see below. return version unless Rails.config.feature_inline_email_images # `attachments` is provided by Rails, see the linked documentation above # URLs should...
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...
...the sudo password with johndoe ALL=(ALL) NOPASSWD: ALL. # Run this script with e.g. `rails runner lib/scripts/benchmark.rb` require 'open3' # For debugging # Rails.logger = Logger.new(STDOUT) # ActiveRecord::Base.logger = Logger.new(STDOUT)
...check Nokogiri::VersionInfo.instance.warnings for any warnings (though they should appear e.g. when launching a Rails console) or Nokogiri::VersionInfo.instance.to_hash to view more information. Note If your application uses Spring...