查询double has_many：通过关联

Question

我有一个双has_many：通过这样的关系：

class Survey < ActiveRecord::Base
  has_many :surveyquestions
  has_many :questions, through: :surveyquestions
end

class Question < ActiveRecord::Base
  has_many :surveyquestions
  has_many :surveys, through: :surveyquestions
  has_many :kpiquestions, dependent: :destroy
  has_many :kpis, through: :kpiquestions
end

class Kpi < ActiveRecord::Base
  has_many :kpiquestions
  has_many :questions, through: :kpiquestions
end

现在我想查询具有特定survey_id和特定kpi_id的问题，但我不确定如何查询？