Ruby on rails Rails 5上与ActiveRecord关联的命名空间键查找

我有以下型号：

class Supervision::ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true

   def self.table_name_prefix
     "supervision_"
   end
end
---------------
class Supervision::Activity < Supervision::ApplicationRecord
  has_one :supervision_missed_visit, class_name: Supervision::MissedVisit
  (...)
end
---------------
class Supervision::MissedVisit < Supervision::ApplicationRecord
  belongs_to :supervision_activity, class_name: Supervision::Activity
  (...)
end

---

如何使Rails了解我实际上在寻找

监督\u错过的访问。监督\u活动\u id

？

您可以指定外键：

有一个：监督\未到访，班级\名称：监督：：未到访，外键：'监督\活动\ id'

另一种方法是在

Supervision:：Activity

中创建一个实例方法：

def missed_visit
  Supervision::MissedVisit.where(supervision_activity_id: id).take
end

ERROR:  column supervision_missed_visits.activity_id does not exist

def missed_visit
  Supervision::MissedVisit.where(supervision_activity_id: id).take
end