tl;dr git checkout is the swiss army of git commands. If you prefer a semantically more meaningful command for...
The robots.txt file and HTML tag can be used to control the behavior of search engine crawlers. Both have different...
For Rails models where only one of multiple attributes may be filled out at the same time, there is no...
Greg Molnar has written a neat article about creating a single-file Rails app. This is not meant for production...
This should be fixed in the latest LTS-branches of our mysql2 fork, 0.2.x-lts and 0.3.x-lts...
When paginating records, we usually need to know the number of total records in order to render pagination links. Popular...
I recently wanted to add a model for address information but also wanted to add a unique index to those...
Imagine these models and associations: class Deck < ApplicationRecord has_many :cards end class Card < ApplicationRecord belongs_to :deck, optional: true...
There is a way to use multiple databases in Rails. You may have asked yourself how you're able to...
tl;dr You can use attribute? as shorthanded version of attribute.present?, except for numeric attributes and associations. Technical Details
You can use Unpoly's up.on with a named listener function and immediately unbind this event listener with { once: true...
Since Rails 6.1, if we use where.not with multiple attributes, it applies logical NAND (NOT(A) OR NOT(B)) instead...
Elasticsearch defaults to go into readonly mode when you run low on disk space (< 95%). You might then see an...
Rails 6.1 has a "strict loading" mode that forces the developer to preload any association they plan to use. Associations...
A flaky test is a test that is often green, but sometimes red. It may only fail on some PCs...
This RailsCast demonstrated a very convenient method to activate VCR for a spec by simply tagging it with :vcr.
We had a card that described how to install multiple mysql versions using mysql-sandbox. Nowadays with the wide adoption...
The linked article points out that COUNT queries might be unexpectedly slow in PostgreSQL. If you just need to know...
When testing JavaScript functionality in Selenium (E2E), you may need to access a class or function inside of a evaluate...
rspec >= 3.1 brings a method and_wrap_original. It seems a bit complicated at first, but there are use cases...
The usual way to build a relation in a ActiveSupport::Concern is this: module MyModule extend ActiveSupport::Concern
When storing files for lots of records in the server's file system, Carrierwave's default store_dir approach may...
When deleting a record in your Rails app, Carrierwave automatically takes care of removing all associated files. However, the file...
To attach files to your records, you will need a new database column representing the filename of the file...