query related has_many model in rails 3 -

i have 2 models user , service. user has_and_belongs_to_many services same goes services:

class user < activerecord::base   has_and_belongs_to_many :services end  class service < activerecord::base   has_and_belongs_to_many :users end

i need find users provide selected services. like:

@users = user.where(:services_ids => [2,3,4])

this should work:

user.join(:services).where(:services.id => [2,3,4]).uniq

Funaction