Code comments allow for adding human readable text right next to the code: notes for other developers, and for your...
Here are some popular mistakes when using nested forms: You are using fields_for instead of form.fields_for.
TL;DR Use the #remove_ ! method to delete attachments. Also, save the record after removing the file!
Say you have a User with a Carrierwave attribute #avatar: class User < ActiveRecord::Base mount_uploader :avatar, AvatarUploader end
When requests arrive at the application servers simultaneously, weird things can happen. Sometimes, this can also happen if a user...
After loading a staging dump into development, you might get an ActiveRecord::EnvironmentMismatchError when trying to replace the database (like...
We can use ActiveRecord's where to add conditions to a relation. But sometimes our condition is not on the...
ActiveRecord has a feature called counter caching where the containing record in a has_many relationship caches the number of...
jQuery offers many different methods to move a selection through the DOM tree. These are the most important: $element.find(selector...
To safely transport an arbitrary string within a URL, you need to percent-encode characters that have a particular meaning...
Or: How to avoid and refactor spaghetti code Please note that I tried to keep the examples small. The effects...
This is a personal post-mortem analysis of a project that was mainly build to provide a REST API to...
PostgreSQL and ActiveRecord have a good support for storing dynamic attributes (hashes) in columns of type JSONB. But sometimes you...
Capybara-screenshot can automatically save screenshots and the HTML for failed Capybara tests in Cucumber, RSpec or Minitest. Requires Capybara...
around(:suite) does not exist. around(:all) runs after before(:all) and before after(:all). around(:each) runs before...
MySQL and MariaDB have an SQL mode setting which changes how MySQL behaves. The SQL mode value is comprised of...
git rebase -i -> mark your commit with edit git reset HEAD~ (remove the marked commit, but keep its...
Calling bundle update (without arguments) updates all your gems at once. Given that many gems don't care about stable...