rails complex search with ancestry - ruby-on-rails

Question

i have following model setup
class Category < ActiveRecord::Base
has_ancestry :cache_depth => true, :depth_cache_column => :depth
has_many :watches, :dependent => :destroy
has_many :products, :through => :watches
end
class Watch < ActiveRecord::Base
belongs_to :category
has_many :products
end
class Product < ActiveRecord::Base
belongs_to :watch, :counter_cache => true
belongs_to :category
end
I need to find products through categories name. Category have 2 levels deep(tree structure). 1 - level is a make, 2 - serie. For now im build this type of search query with the help of meta_search gem
#products = (Product.search :watch_category_name_contains => params[:search]).all.paginate(:page => params[:page])
This works and return all products with serie_name. But watch table always contain only category_id of 2 level category(serie), and im need to be able to search products through makes(1 level category). How can i build this type of query? Thanks!

Answer 1

Well, i see some upvotes coming on my old question, so i will answer. Im finish with raw sql for makes and series queries. Here it is:
def self.makes_with_products
find_by_sql "
SELECT makes.* FROM categories makes
WHERE ancestry IS NULL AND makes.id IN (
SELECT series.ancestry FROM products p
INNER JOIN watches w ON w.id = p.watch_id
INNER JOIN categories series ON series.id = w.category_id
WHERE series.ancestry = makes.id AND p.active
)
"
end
def series_with_products
find_by_sql "
SELECT series.* FROM categories series
WHERE series.ancestry = '#{id}'
AND (
SELECT COUNT(*) FROM products p
INNER JOIN watches w ON w.id = p.watch_id
WHERE w.category_id = series.id AND p.active
) > 0
"
end
Hope this help someone.