An end-to-end test (E2E test) is a script that remote-controls a web browser with tools like Selenium...
Slides for Henning's talk on Sep 21st 2017. Understanding sync vs. async control flow Talking to synchronous (or "blocking...
If you are using PDFKit / wkhtmltopdf, you might as well want to use custom fonts in your stylesheets. Usually this...
Download the dictionary from http://www.winedt.org/dict.html, e.g. http://www.winedt.org/dict/de_neu.zip unzip de_neu.zip mkdir ~/Documents/dic iconv -f UTF-16 -t...
You need to set the :inverse_of option manually for relations that have an association to a polymorphic model. Otherwise...
When you want to group rails models of a logical context, namespaces are your friend. However, if you have a...
RSpec allows defining methods inside describe/context blocks which will only exist inside them. However, classes (or any constants, for that...
FactoryBot allows a :class option to its factory definitions, to set the class to construct. However, this option is not...
There are several gems that make it easy to read and process xlsx files. Parsing the entire file at once...
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...
You need to disable "Bluetooth low energy", then follow these core steps: Make sure the headphones are in pairing mode...
Use return to return from a method. return accepts a value that will be the return value of the...
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...
You should prefer native promises to jQuery's Deferreds. Native promises are much faster than their jQuery equivalent. Native promises...
Native promises have no methods to inspect their state. You can use the promiseState function below to check whether a...
You can use local copies of gems in your Gemfile like this: gem 'spreewald', path: '~/gems/spreewald' As soon as you...
rack-cargo gives your API a new /batch route that lets clients perform multiple API calls with a single request...
Sometimes you add Paperclip image styles, sometimes you remove some. In order to only keep the files you actually need...
In the ruby shell (IRB) and rails console the return value of the previous command is saved in _ (underscore). This...
I often see the use of || to set a default value for a variable that might be nil, null or...