Using Delta Indexes for associations in Thinking Sphinx

Question

I have a Product model:

class Product < ActiveRecord::Base
    belongs_to :subcategory

    define_index do

        # fields
        indexes subcategory.         


        

Answer 1

Try the following instead:

def set_product_delta_flag
  Product.update_all ['delta = ?', true], ['subcategory_id = ?', id]
  Product.index_delta
end

A single SQL statement, a single delta re-indexing. Should perform far better :)