In Rails 5+ you can access a helper from a controller using the helpers method: # Inside a controller action helpers.link_to 'Foo', foo_path In older Rails versions you can...
The benefit of the Rails asset pipeline is that it compiles your stylesheets and javascripts to a single file, respectively. However, the consequences are startling if you don't understand...
...gave every library its own "root" folder. First, add this line to your config/initializers/assets.rb: Rails.application.config.assets.paths += Dir["#{Rails.root}/vendor/asset-libs/*"].sort_by { |dir| -dir.size } This will tell Rails about the custom asset...
To read the Rails session from a Rack middleware, use env['rack.session']. It's an ActionDispatch::Request::Session object. class MyMiddlware def initialize(app) @app = app end def call(env...
...status, headers, body = @app.call(env) session = env['rack.session'] Rails.logger.info("Value of session['foo'] is: " + session['foo'].inspect) [status, headers, body] end end You may not be able to write to...
...a situation in which I received the yarn integrity check warning when starting the rails console even though everything was up to date and correct versions in use.
I tried starting the rails console without switching to the correct node version first and received the yarn integrity warning. warning Integrity check: System parameters don't match...
Starting from Rails 4.0, you can use a special form options helper called #collection_check_boxes. It behaves similar to #collection_select, but instead of a single select field it...
Note the hidden input at the end. This is a trick that Rails uses so users can uncheck all the check boxes. If this hidden input wasn't...
If your irb or rails console keeps randomly crashing and you can't figure out why then you can try to disable multi-line autocomplete...
} } } } } Integration in Rails + searchkick Was benötigt man für Integration von Elastic in eine Rails-Anwendung? Mindestens: Client um mit Elastic zu reden Erzeugen von Indexen, passender Mappings + Migration...
To ensure Spring is not running: bin/spring stop pkill -f spring To prevent Spring from starting again: export DISABLE_SPRING...
The linked content includes a few design patterns implemented with Ruby on Rails. What is the card indented to achieve? You can use the pattern names for code reviews, so...
Sometimes you want to have a time in a given timezone independent from you Rails timezone settings / system timezone. I usually have this use case in tests. Example
...return different results e.g. 2020-08-09 00:00:00 +0200 depending on the Rails timezone settings / system timezone. But in this example we always want to have the given...
Rails defines a #truncate helper as well as a method String#truncate. = truncate("my string", length: 5) = "my string".truncate(5) Both are really similar; in fact, the helper invokes...
The author describes his little journey in hunting down a memory leak. Maybe his approach and tooling may one day...
Create, or edit your ~/.irbrc file to include: require 'irb/ext/eval_history' # was 'irb/ext/save-history' for versions prior to Ruby 3.3 IRB.conf[:SAVE...
When logging in Rails, you can use the log_tags configuration option to add extra information to each line, like :request_id or :subdomain. However, those are only valid inside...
...log entries which are mixed together. Welcome to debugging hell. You want something like Rails' :request_id tagging. This can easily be achieved through a Sidekiq middleware as follows.
...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...
...concept worked really good. Here are two points that were extraordinary compared to normal Rails project with many UI components: Having a Rails application, that has no UI components (only...
...to look up different before you need to integrate an API component into your Rails application. REST API vs. GraphQL It is worth to consider whether you want to have...
Rails 5.2+ supports "verbose query logs" where it shows the source of a query in the application log. Normally, it looks like this: User Load (0.5ms) SELECT "users".* FROM...
...While there was an issue back in 2018 which can be resolved by upgrading Rails, this also happens when ActiveSupport's BacktraceCleaner is configured to not hide gems from the...
tl;dr: Upgrade the gem to at least 4.0.1 When you use rspec_rails in a version < 4 with Rails 6.1 you may encounter an error like this: Failure/Error:
...expect(actor).to be_valid end end But the error came from rspec_rails itself. I found this issue on GitHub, which is solved in rspec_rails 4.0.1.
...Gruff for easily plotting graphs. It is written in pure Ruby and integrates with Rails applications. It provides features as automatic sizing of dots and lines (the more values, the...
...restart your development server.) Usage This is a common example for graph generation in Rails. Note that you have many configuration options at hand that are not documented. Github and...
If you use webpacker in your Rails application, and you have completely disabled Sprockets, you might get the following error when trying to deploy: Rails assets manifest file not found...
...This happens inside the deploy:assets:backup_manifest task. This task comes from capistrano-rails. It is build for Sprockets and does not work with Webpacker out of the box...
You can use record.send(:update_without_callbacks) or record.send(:create_without_callbacks) This can be used as a lightweight alternative to machinist's make or FactoryGirl's create...
...return the object, so you might want to do record = Record.new.tap(&:create_without_callbacks) Rails 3 Rails 3 no longer comes with update_without_callbacks or create_without_callbacks. There...
Rails supports alert and notice as default flash types. This allows you to use these keys as options in e.g. redirect_to and as a helper in views e.g. <%= notice...
To offer files for download, use send_file. def download(file) send_file file.path, :disposition => 'attachment' end
...has to wait until the thread of one of the workers is free. Threads Rails is thread-safe since version 4 (note that not all gems are thread-safe). This...
...for the related config/puma.rb: workers Integer(ENV['WEB_CONCURRENCY'] || 2) threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 5) Note: Having multiple workers in development and tests might cause unexpected issues...