When you repeat a subpattern with a *, + or {...} operator, you may choose between greedy, lazy and possessive modes. Switching modes...
Recently I made an upgrade from Bootstrap 3 to Bootstrap 4 in a bigger project. Here are some tips how...
When deploying a Rails application that is using Webpacker and Capistrano, there are a few configuration tweaks that optimize the...
Sometimes you want to find the inverse of an ActiveRecord scope. Depending on what you want to achieve, this is...
It sometimes happen that a database dump, that would want to insert into your development database, does not match the...
If a model inherits from others or uses many concerns / traits, it might be hard to see in the code...
When logging in Rails, you can use the log_tags configuration option to add extra information to each line, like...
After performing a live migration of a VM you may encounter issues with the clock of the migrated VM. The...
ActiveRecord provides the ids method to pluck ids from a scope, but what if you need to pluck Global IDs...
A flat folder structure can be cool if you have only a few folders but can be painful for huge...
Rails 5.2+ supports "verbose query logs" where it shows the source of a query in the application log.
When you use Sentry to monitor exceptions, an important feature is Sentry's error grouping mechanism. It will aggregate similar...
Rails middlewares are small code pieces that wrap requests to the application. The first middleware gets passed the request, invokes...
If you migrate a Rails application from Sprockets to Webpack(er), you can either transpile your CoffeeScript files to JavaScript...
If you have a :string or :text field, you should pair it with a model validation that restricts its length...
PostgreSQL offers three character types for your columns: character varying(n) (also called varchar or just string): Contents are limited...
Speaker today is Henning Koch, Head of Development at makandra. This talk will be in German with English slides.
In Active Record you can use named bindings in where-conditions. This helps you to make your code more readable...
"Everything in Ruby is an object". This is also true for nested hashes and arrays. If you copy a hash...
A recent patch level Ruby update caused troubles to some of us as applications started to complain about incompatible gem...
We can use ActiveRecord's where to add conditions to a relation. But sometimes our condition is not on the...
PostgreSQL and ActiveRecord have a good support for storing dynamic attributes (hashes) in columns of type JSONB. But sometimes you...
Debugging image color profiles is hard. You can't trust your eyes in this matter, as the image rendering depends...
It's every developer's nightmare: SQL queries that get large and unwieldy. This can happen fairly quickly with the...