In the past we validate and set default values for boolean attributes in Rails and not the database itself. Reasons for this: Older Rails didn't support database defaults when...
An alternative approach, which currently reflects more the general opinion of the Rails upstream on constraints in the database, is adding default values in the schema of the...
Just found out about a great feature in Rails that seems to be around since Rails 2. Start a console with the --sandbox (or -s) parameter: rails console --sandbox
...good solution to work around this. When you migrate to managing vendor assets in Rails with Bower, the bower-rails gem comes with its own solution for this problem. It...
...can configure your application to automatically resolve paths before precompiling assets: BowerRails.configure do |bower_rails| # Invokes rake bower:resolve before precompilation. Defaults to false bower_rails.resolve_before_precompile = true
...in any structure. While its flexibility is great, there is no syntactic sugar in Rails yet. Thus, you need to manually query the database. Demo # Given a Task model with...
ActiveModel supplies an errors object that behaves similar to a Hash. It can be used to add errors to a...
SQL end Usage example: insert_record 'users', name: 'joe', age: 15 Also see Rails: Talking to the database without instantiating ActiveRecord objects...
So you want to organize your I18n using multiple .yml files but your Rails 4.1 application simply won't use any extra files in development? Spring is to blame.
...a proof of concept how a integration (slightly different as the official docs for Rails) might look like in Rails + webpack + Unpoly. Also see the HN discussion for pro and...
...gem with strategy :transaction, after_commit callbacks will not be fired in your tests. Rails 5+ Rails 5 has a fix for this issue and no further action is needed...
...Rails 3, Rails 4 Add the gem test_after_commit to your test group in the Gemfile and you are done. You don't need to change the database strategy...
On the Rails console, assigning an object to a variable can lead to this strange error (without stacktrace): irb > recipient = Recipient.find(123) Traceback (most recent call last): TypeError (nil can...
...gem install reline, or in projects with Bundler: gem 'reline', '>= 0.2.0' # Fixes TypeError in Rails console
To reverse lookup a fixture by its table name and id, use the following approach on ActiveRecord::FixtureSet: table = 'users...
...in our tests for sequential test execution but not for parallel test execution. And Rails requires you to set the config.cache_classes = false if you are using Spring in tests...
...With our setup, this would raise the following error in cucumber-rails for parallel test executions due to some legacy database cleaner issue. WARNING: You have set Rails' config.cache_classes...
You can use constraints in your routes.rb to avoid getting ActionView::MissingTemplate errors when wrong routes are called. Instead, the...
...nicer to read, but has horrible security implications in some versions of Ruby on Rails. Affected versions Version Affected? Remedy 2.3.18 yes Use chain_safely workaround 3.0.20 no
Use Rails LTS 3.2 with hardened configuration 4.0.x ??? ??? 4.2.3 no Example When you chain two scopes with hash conditions on the same attribute, the second scope will overwrite...
Let's say you have a form that you render a few times but you would like to customize your...
This card describes how to install some tasks only for a given Rails environment or for a given Capistrano stage ("deployment target"). Installing jobs only for a given...
...Rails environment In your schedule.rb you may use environment variable to access the Rails environment of the current deployment: if environment == 'staging' every :day do # Setup job that will only...
When an object is created / updated, various callbacks are executed in this order: before_validation after_validation before_save
The change_column method for rails migrations support casting with a custom SQL statement. This allows us to change a column type and keep the former content as the new...
Most of our applications use CarrierWave for file uploads. CarrierWave has an integrated processing mechanism for different file versions with...
Middleman is a static page generator that brings many of the goodies that Rails developers are used to. Out of the box, Middleman brings Haml, Sass, helpers etc. However, it...
...to do even better. This card is a list of improvement hints for a Rails developer. Gemfile Remove tzinfo-data and wdm unless you're on Windows. Add these gems...
...to some path methods generated by your routes. Even though you could technically include Rails.application.routes.url_helpers, this may include way too many methods and even overwrite some class methods in...
...advised to only make the desired methods available: class Project delegate :url_helpers, to: 'Rails.application.routes' def project_path url_helpers.project_path(self) end
By default most exceptions in Rails will render a 500 error page and will create a new issue in your error monitoring. There are some built-in rules in Rails...
Code snippet tested with Rails 2.3 def index # ... if request.xhr? html = render_to_string(:partial => "list", :layout => false) respond_to do |format| format.html { render :text => html } format.json { render :json => {:html...
...this card might help. If you call render_to_string within the format.json block, Rails will only look for an index.json template, but not for an index.erb template...
...to configure omniauth-multi-provider to support multiple SAML identity providers for a single Rails app: To solve this, the omniauth-multi-provider gem acts as a dynamic wrapper around...