How to do proper database testing (TDD) on Rails 3 using MongoDB and Mongoid

Question

How would go about writing proper unit testing (and integration testing for that matter) using MongoDB through Mongoid on Rails ?

I am asking, because to the opposite of

Answer 1

Ok thanks to Kyle who pointed me in the right direction, I found out how to make it work.

So basically the trick is to drop all your collections in mongodb for each test case that you will run. This is a bit radical, but it works. But keep in mind that you won't retain any data at all in you test db.

Finally I found that link: http://adventuresincoding.com/2010/07/how-to-configure-cucumber-and-rspec-to-work-with-mongoid

And basically what you need to do is simple:

add a block in you spec_helper.rb:

RSpec.configure do |config|

# blabla other confs

  config.before :each do
    Mongoid.master.collections.select {|c| c.name !~ /system/ }.each(&:drop)
  end

# blabla other confs

end

For Mongoid 3:

 Mongoid.default_session.collections.select {|c| c.name !~ /system/ }.each(&:drop

This effectively kills all the collection within the db allowing you to run your tests fresh every time.

Alex