When you load a dump for development, records may reference images that are not available on your machine.

This is a visualization of the files that will be generated by some useful rails generators. Invoke a generator from...

Adding a gem means you take over the liability towards the external code. Checklist Based on "To gem, or not...

We generally use multiple application servers (at least two) and you have to search on all of them if you...

The rack-contrib gem brings a JSONP middleware that just works™. Whenever a JSON request has a callback parameter, it...

TruffleRuby is an experimental Ruby implementation that tries to achieve ~10x performance over MRI. This has been on our radar...

Adopting legacy Rails apps Talk to your mentor about how we're approaching applications that are either old or abandoned...

So you're getting an error like this: undefined method `activate_bin_path' for Gem:Module (NoMethodError)

Put the following into config.ru in your Rails root folder: # Require your environment file to bootstrap Rails require ::File.dirname(__FILE...

Building plain text emails with an .erb template doesn't allow you to indent code like you normally do in...

This card tries to summarize by example the different uses of heredoc. In Ruby << vs. <<- vs. <<~ In Rails strip_heredoc...

We used zeroclipboard.js in some of our projects but now we switched to clipboard.js because it does not rely on...

Yesterday I stumbled across a talk in which the guy mentioned module sub-classing. I was curious what you can...

Instantiating ActiveRecord objects comes expensive. To speed up things, you can choose a more direct way to talk to your...

When working with custom transactions and use ActiveRecord::Rollback you may encounter unexpected behaviour if you try to roll back...

We often use VCR to stub external APIs. Unfortunately VCR can have problems matching requests to recorded cassettes, and these...

#reverse_order does not work with complex sorting constraints and may even silently create malformed SQL for rails < 5.

Rails 5 / 6 / 7 Method Uses Default Accessor Saves to Database Runs Validations Runs Callbacks Updates updated_at/updated_on Respects Readonly...

You might get the above error message when cloning certain git repositories (for example the rails repository). It indicates that...

Detect if a gem has been activated A gem is activated if it is either in the current bundle (Gemfile.lock...

We have released a new library Gemika to help test a gem against multiple versions of Ruby, gem dependencies and...

Rails 5 migration classes look like this now: class CreateUsers < ActiveRecord::Migration[5.0] Mind the [5.0] at the end.

ActiveSupport::Notifications provides an instrumentation API for Ruby. It is used throughout rails to publish instrumentation events that include information...

You know those helper methods that just render some HTML but look weird because of content_tags all over the...