Paranoia's 'with_deleted' command not working on Rails tasks

Question

I have the following task to run on Rais:

require 'net/http'
namespace :seed do

task :set_gid_on_histories => :environment do

    History.all.each do |hist|

        if hist.channel != "REMOTE"
            if hist.guest
                guest = Guest.find(hist.user_group_id)
                hist.update_attributes(:group_id => guest.group_id)    
            else
                ug = UserGroup.with_deleted.find(hist.user_group_id)
                hist.update_attributes(:group_id => ug.group_id)    
            end     

        end

    end
end

end

The problem happens in line

ug = UserGroup.with_deleted.find(hist.user_group_id)

What happens is that it's throwing

ActiveRecord::RecordNotFound: Couldn't find UserGroup with 'id'=71 [WHERE "user_groups"."deleted_at" IS NULL]

just as if there was no 'with deleted' on the command line.

I tried to type the same command on rails console and it worked, i.e. when I run ug = UserGroup.with_deleted.find(71) it works just fine and finds the deleted user.

So it seems that paranoia's 'with_deleted' command is not working on rails tasks... Am I missing something?