It's possible to override a method that Mongoid uses internally to break Mongoid

I have a model Slot:

<pre>class Slot
include Mongoid::Document
field :title, :type => String
def empty?
title.blank?
end
end
</pre>

I have configured my rails application to log mongodb queries into STDOUT

One of my spec contains two lines:

<pre> puts Slot.where(:_id => slot.id).first.id
Slot.find(slot.id)</pre>

line 2 raises an error Mongoid::Errors::DocumentNotFound

STDOUT:

<pre>MONGODB ffapi_test1['slots'].find({:_id=>BSON::ObjectId('4d99c9500b73e09e44000014')})
4d99c9500b73e09e44000014
MONGODB ffapi_test1['slots'].find({:_id=>BSON::ObjectId('4d99c9500b73e09e44000014')})</pre>

I am using mongoid from master branch.

The empty? definition is the problem here. Once removed, things come right.