Rails 5上的命名空间键查找与ActiveRecord的关联

Question

我有以下型号：

$exam[2]

我也有这个模型，它没有被命名空间：

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

每当我尝试通过其class Activity < ApplicationRecord (...) end 关系尝试Supervision::MissedVisit时，如

has_one

我收到以下错误：

@supervision_activity.supervision_missed_visit

如何让Rails明白我实际上在寻找ERROR: column supervision_missed_visits.activity_id does not exist ？

Answer 1

您可以指定外键：

For i = 1 To 10 Debug.Print Me.Controls("chk" & i).Name & vbTab & Me.Controls("chk" & i).Value Next i

另一种方法是在has_one :supervision_missed_visit, class_name: Supervision::MissedVisit, foreign_key: 'supervision_activity_id'中创建一个实例方法：

Supervision::Activity