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假設我有機型（自動生成的？）_ids給出的ActiveRecord :: UnknownPrimaryKey錯誤
class Widget < ActiveRecord::Base
has_many :widget_spots
和
class WidgetSpot < ActiveRecord::Base
belongs_to :widget
而且，在我的MySQL表 'widget_spots'，我有一列' WIDGET_ID」
+--------------------+------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------------+------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| widget_id | int(11) | NO | PRI | NULL | |
................
+--------------------+------------+------+-----+---------+-------+
現在，如果在我的rails控制檯，嘗試訪問widget_spot_ids給出了一個錯誤。
> widget = widgets.find(:first)
> widget.widget_spot_ids
ActiveRecord::UnknownPrimaryKey: ActiveRecord::UnknownPrimaryKey
from /Users/xxxxx/.rvm/gems/[email protected]/gems/activerecord-3.1.1/lib/active_record/reflection.rb:374:in `primary_key'
from /Users/xxxxx/.rvm/gems/[email protected]/gems/activerecord-3.1.1/lib/active_record/reflection.rb:228:in `association_primary_key'
from /Users/xxxxx/.rvm/gems/[email protected]/gems/activerecord-3.1.1/lib/active_record/associations/collection_association.rb:51:in `ids_reader'
from /Users/xxxxx/.rvm/gems/[email protected]/gems/activerecord-3.1.1/lib/active_record/associations/builder/collection_association.rb:62:in `block in define_readers'
from (irb):12
from /Users/xxxxx/.rvm/gems/[email protected]/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in `start'
from /Users/xxxxx/.rvm/gems/[email protected]/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in `start'
from /Users/xxxxx/.rvm/gems/[email protected]/gems/railties-3.1.1/lib/rails/commands.rb:40:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
然而，得到的情況下給出了一個列表，而一個錯誤：> widget.widget_spots執行預期的SQL查詢，並給出了一個清單。
如何確定在哪裏以及如何生成ActiveRecord::UnknownPrimaryKey錯誤。試圖找出哪個數據庫中的哪個主鍵？