Google Summer of Code winner: ActiveModel for Ruby on Rails
Finish the remainder of the ActiveModel todo list (observers, callbacks, validations, scoping, and serialization) in addition to associations. Also wire up ActiveModel up to ActiveRecord and ActiveResource.
Related cards:
Rails: Custom validator for "only one of these" (XOR) presence validation
For Rails models where only one of multiple attributes may be filled out at the same time, there is no built-in validation.
I've seen different solutions in the wild, each with different downsides:
- Private method referenced via
validate: wor...
MongoMapper for Rails 2 on Ruby 1.9
MongoMapper is a MongoDB adapter for Ruby. We've forked it so it works for Rails 2.3.x applications running on Ruby 1.9. [1]
makandra/mongomapper is based on the "official" rails2 branch [2] which contains commits t...
Embed Google Analytics code for some environments only
When you use google analytics to track your visitors interactions, you should ensure that it runs on your production site only. Otherwise it will spoil your statistics. To prevent this, test for the right environment and place the JS-code afterwar...
Ruby, Ruby on Rails, and _why: The disappearance of one of the world’s most beloved computer programmers
Nice article to educate your non-geek girlfriend/boyfriend about the joys of programming.
Lightning Talk: Coverage based Test Case Prioritization in Ruby on Rails
For my computer science bachelor's thesis I programmed and evaluated a CLI Test Case Prioritization (TCP) tool for makandra. It has been written as a Ruby Gem and was tested and evaluated against one Ruby on Rails project....
Good real world example for form models / presenters in Rails
We have often felt the pain where our models need to serve too many masters. E.g. we are adding a lot of logic and callbacks for a particular form screen, but then the model becomes a pain in tests, where all those callbacks just get in the way. O...
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...
Remove resource fork files from a FAT volume on MacOS
Be careful!
The following solution will delete files on a volume. If you don't know exactly what you're doing, you can run into big trouble with your computer.
I play mp3 files on my car stereo that are stored on a SD-C...
Postgres: DISTINCT ON lets you select only one record per ordered attribute(s) for each group
-
To retrieve only unique combinations of the selected attributes: You can omit rows, where all selected columns are equal with the
DISTINCTstatement. - To retrieve the group wise maximum of certain columns: You can keep only one record fo...