search.rb

class Foo
  has_many :tags
  has_many :states

  # q is hash: { "tags" => "ruby", "states" => "open" }
  def self.search(q)
    # wat do?
  end
end

# search should return a relation that scopes everything to the terms
# the values 'ruby' and 'open' are in the 'name' attribute of the Tag and State model.