krisleech/wisper
Publish/subscribe for Ruby classes. Bonus: You do not have to declare events before using them.
Related cards:
How to make changes to a Ruby gem (as a Rails developer)
At makandra, we've built a few gems over the years. Some of these are quite popular: spreewald (> 1M downloads), active_type (> 1M downloads), and geordi (> 200k downloads)
Developing a Ruby gem is different from developing Rails applications, w...
Invoices: How to properly round and calculate totals
While it might seem trivial to implement an invoice that sums up items and shows net, gross and vat totals, it actually involves a lot of rules and caveats. It is very easy to create invoices where numbers don't add up and a few cents are missing....
How to not leave trailing whitespace (using your editor or Git)
There is no reason to leave trailing whitespace characters in your project's files, so don't add any.
A git diff --check
will tell you if there are any and you should not commit when you see them. So go ahead and switch your editor/IDE to autom...
How to: Upgrade CarrierWave to 3.x
While upgrading CarrierWave from version 0.11.x to 3.x, we encountered some very nasty fails. Below are the basic changes you need to perform and some behavior you may eventually run into when upgrading your application. This aims to save you some...
Story Checklist Template
This is an story checklist I use to work on stories. For this purpose I extracted several cards related to the makandra process and ported them into a check list...
The Ruby Object Model
In Ruby (almost) everything is an Object
. While this enables a lot of powerful features, this concept might be confusing for developers who have been programming in more static languages, such as Java or C#. This card should help understanding t...
How to not repeat yourself in Cucumber scenarios
It is good programming practice to Don't Repeat Yourself (or DRY). In Ruby on Rails we keep our code DRY by sharing behavior by using inheritance, modules, traits or partials.
When you reuse behavior y...
Delivering Carrierwave attachments to authorized users only
Preparation
To attach files to your records, you will need a new database column representing the filename of the file. To do this, add a new migration (rails g migration <name>
) with the following content:
class AddAttachmentToNotes...
How to not die with ActionView::MissingTemplate when clients request weird formats
When HTTP clients make an request they can define which response formats they can process. They do it by adding a header to the HTTP request like this:
Accept: application/json
This means the client will only understand JSON respon...
Using before(:context) / before(:all) in RSpec will cause you lots of trouble unless you know what you are doing
TL;DR Avoid before(:context)
(formerly before(:all)
), use before(:example)
(formerly before(:each)
) instead.
If you do use before(:context)
, you need to know what you are doing and take care of any cleanup yourself.
Why?
...