multiple model search with acts_as_solr_reloaded

I have used act_as_solr_reloaded plugin for searching option in my
project
I have two models which are brand and sku and its association are

class Brand < ActiveRecord::Base
acts_as_solr :include => [:skus],:fields =>
[:id,:name,:description,:active]
end

class Sku < ActiveRecord::Base
acts_as_solr :include => [:brand],:fields =>
[:id,:name,:description,:brand_id,:active{:price=>:range_float},{:date
=> :date}]
end

I should form conditions from multiple models like
brands.active='true' and skus.active='true and brands.id=skus.brand_id
and skus.date between 'from date' and 'to date'

I am really struggle with date range search.
please help me how to make search like above using act_as_solr_reloaded