Binarylogic Searchlogic

It seems Searchlogic doesn't support AR nested conditions.
I have the following database schema

class Product < ActiveRecord::Base
  has_many :gateways, :dependent => :destroy
  has_many :partners, :through => :gateways
end

class Partner < ActiveRecord::Base
  has_many :gateways, :dependent => :destroy
  has_many :products, :through => :gateways
  # partner has a published boolean field
end

class Gateway < ActiveRecord::Base
  belongs_to :product
  belongs_to :partner
end

When I try to run a query with nested conditions, like the following one

Gateway.all(:joins => :partner, :conditions => { :partners => { :published => true }}, :order => 'position')

Searchlogic raises a NoMethodError

1) Error:
test_selectable_partners(ProductTest):
NoMethodError: undefined method `partners=' for #<GatewayConditions>
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/conditions/magic_methods.rb:185:in `method_missing'
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/active_record/base.rb:167:in `send'
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/active_record/base.rb:167:in `filter_options_with_searchlogic'
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/active_record/base.rb:167:in `each'
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/active_record/base.rb:167:in `filter_options_with_searchlogic'
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/active_record/base.rb:21:in `find'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:609:in `all'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/associations/association_collection.rb:370:in `send'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/associations/association_collection.rb:370:in `method_missing'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:2003:in `with_scope_without_searchlogic'
  /Library/Ruby/Gems/1.8/gems/searchlogic-1.6.4/lib/searchlogic/active_record/base.rb:47:in `with_scope'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/associations/association_proxy.rb:202:in `send'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/associations/association_proxy.rb:202:in `with_scope'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/associations/association_collection.rb:366:in `method_missing'
  ...

It doesn't matter whether the query takes advantage of Searchlogic features or not. As soon as I load the GEM all my queries are invalidated.