Font Awesome version 5 changed some icon names, and introduces new prefixes fab, far, and fas. There is a JavaScript...

TL;DR Use user.update!(remove_avatar: true) to delete attachments outside of forms. This will have the same behavior as...

To check which elements an ActiveRecord relation contains use the contain_exactly matcher. describe User do let!(:admin) { create(:user...

This is a small example on how you can check if your Postgres index can be used by a specific...

This is painful. Consider using Microsoft Office or switching careers. If you need to write < 20 letters consider doing it...

This error is raised because your old database does not have a configured environment yet, which Rails 5 enforces.

You should avoid using application models in your migrations. But how else could you create records in a migration?

PostgreSQL's Common Table Expressions (CTEs) can be used to extract sub-queries from bulky SQL statements into a temporary...

PostgreSQL supports the SQL OVERLAPS operator. You can use it to test if two date ranges overlap: => SELECT ('2001-02...

Git has two kind of tags: annotated lightweight Annotated tags are stored as full objects in the Git database. They...

We're usually running Ubuntu LTS versions. Sometimes newer hardware requires packages from more recent Ubuntu releases that only come...

Checking if a JavaScript value is of a given type can be very confusing: There are two operators typeof and...

An end-to-end test (E2E test) is a script that remote-controls a web browser with tools like Selenium...

When your public-facing application has a longer downtime for server maintenance or long migrations, it's nice to setup...

Slides for Henning's talk on Sep 21st 2017. Understanding sync vs. async control flow Talking to synchronous (or "blocking...

You need to set the :inverse_of option manually for relations that have an association to a polymorphic model. Otherwise...

After loading a staging dump into development, you might get an ActiveRecord::EnvironmentMismatchError when trying to replace the database (like...

When localizing model attributes via I18n you may run into errors like this: I18n::InvalidPluralizationData: translation data {...

...} can not be...

If another session is accessing your database you are trying to reset or drop you might have seen the following...

I frequently find myself needing a combination of group_by, count and sort for quick statistics. Here's a method...

before(:all) runs the block once before all of the examples. before(:each) runs the block once before each...

There are many approaches out there how you can import data from a legacy application to a new application. Here...

Scope is all about where something is visible. It’s all about what (variables, constants, methods) is available to you...