テーブルのIDがそこにある場合でも、「テーブルの不明な主キー...」というRailsのこの奇妙な問題をデバッグしています。
データベースをあるherokuアプリから別のアプリにコピーしましたが、元のデータベースでは問題はなく、新しいデータベースではdbエラーが発生します。
これはエラーです:
ProductsController# (ActionView::Template::Error) "Unknown primary key for table collections in model Collection."
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/reflection.rb:366:in `primary_key'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/reflection.rb:480:in `association_primary_key'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association_scope.rb:58:in `block in add_constraints'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association_scope.rb:39:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association_scope.rb:39:in `each_with_index'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association_scope.rb:39:in `add_constraints'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association_scope.rb:31:in `scope'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association.rb:98:in `association_scope'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/association.rb:87:in `scoped'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/collection_association.rb:573:in `first_or_last'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/collection_association.rb:105:in `last'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.13/lib/active_record/associations/collection_proxy.rb:46:in `last'
/app/app/helpers/likes_helper.rb:62:in `significant_liker'
それを引き起こす行:
product.collections.last.try :user
そしてテーブル:
d8apjspa441pad=> \d collections
Table "public.collections"
Column | Type | Modifiers
----------------+------------------------+----------------------------------------------------------
id | integer | not null default nextval('collections_id_seq'::regclass)
name | character varying(255) |
user_id | integer |
permalink | character varying(255) |
category_id | integer |
products_count | integer |
is_featured | boolean |
Indexes:
"index_lists_on_user_id_and_permalink" UNIQUE, btree (user_id, permalink)
なぜこれが起こるのでしょうか?
ありがとう!