MR Damien wrote:
>> Migration
>> ---------
>> class CreateSubtasks < ActiveRecord::Migration
>>   def self.up
>>     create_table :subtasks do |t|
>>       t.string  :hostname, :type
> It seems that :type should not be used as a column name.

I'm guessing that this (from ActiveRecord::Base doc) has something to do 
with it:

------------------------
Single table inheritance

Active Record allows inheritance by storing the name of the class in a 
column that by default is named "type" (can be changed by overwriting 
Base.inheritance_column).
------------------------

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