Sometimes huge refactorings or refactoring of core concepts of your application are necessary for being able to meet new requirements...
Exercise 1: XML On the start page of your Movie DB, show the title of a random movie that is...
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)
If your Carrierwave uploader dynamically generates the filename (e.g. by incorporating a user's name), you must call model.save! after...
TL;DR: Update the 'net-ssh' gem by adding to your Gemfile: gem 'net-ssh', '=2.9.1' Now run bundle update...
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...
This method will remove automatically installed packages that no other packages depend on any more. This, of course...
When running tests via parallel_tests, you may encounter an error: cannot load such file -- parallel_tests/gherkin/runtime_logger Error creating formatter...
When you're writing specs for ActiveRecord models that use memoization, a simple #reload will not do: it 'updates on...
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...
Closure_tree lets your ActiveRecord models act as nodes in a tree data structure. This promises a few improvements over...
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...
You can have a command repeatedly executed and the output displayed. This is useful e.g. for monitoring file system changes...
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...