How do I get Index-tank to do conditional indexing?

After a long conversation with the fine people at IndexTank, I was not really sure on how to fix my problem, and I was wondering if anyone could help me.

I have an article model that belongs to a user model. This article model also has a boolean attribute called anonymous, which, if set to true gives the user the option to post the article without his name being shown.

Article
belongs_to :user
attr_accesible :开发者_如何学运维anonymous, :user_id

User
has_many :articles

My problem is that if the article is posted as anonymous. I don't want tanker to search within the author name field, but I want it searching every other field. I tried to do this with an if else statement where I would normally put the "tankit" block, but that does not work.

Is there a way I could put the tankit block into a model method and use a validation call back like this?

def anon_index
    if self.anonymous
      tankit 'my_index' do
        indexes VARIABLES ETC BUT NOT the user_ attributes
      end
    else # if anonymous is false
      tankit 'my_index' do
        indexes :title
        indexes :body
        indexes :user_penname
        indexes :user_firstname
        indexes :user_lastname
      end
    end
  end

I was thinking either this or putting an if else statement where the "tankit" block declaration goes, but neither of those seem to, unless I'm doing something wrong.

---

how does this look?:

class Article < ActiveRecord::Base

 tankit 'my_index' do
       indexes :title
       indexes :body
       indexes :custom_penname
       indexes :custom_firstname
       indexes :custom_lastname
 end

 def custom_penname
   if self.anonymous
     'anonymous'
   else
     self.user_penname
   end
 end

 def custom_firstname
   #same for first name
 end
 def custom_lastname
   #same for last name
 end
end

Same approach, different scenario:

https://github.com/adrnai/rails-3-tanker-demo/blob/master/app/models/comment.rb