Rails Postgres Schema 引用回滚问题

Question

在我的 rails 应用程序中，我有多个 postgresql 模式。

SHOW search_path;

search_path
--------------
"$user",public,vehicle

我在车辆架构中有两个 table（经销商、库存）。这种关系是这样的：

dealer has_many inventories
inventory belongs_to dealer

我创建了一个迁移以将关系添加为：

class AddDealerIdToVehicleInventories < ActiveRecord::Migration
  def change
    add_reference 'vehicle.inventories', :dealer, index: true, foreign_key: {on_delete: :cascade}
  end
end

当我运行: rake db:migrate 时，此迁移工作完美，foreign_key 似乎毫无问题地添加到 table。但是当我运行 rake db:rollback 时，我收到此错误消息：

StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedColumn: ERROR:  column "vehicle.dealer_id" referenced in foreign key constraint does not exist
: ALTER TABLE "vehicle"."inventories" ADD CONSTRAINT "fk_rails_95ee16593d"
FOREIGN KEY ("vehicle.dealer_id")
  REFERENCES "vehicle"."dealers" ("id")
 ON DELETE CASCADE

我不确定我是否犯了任何错误，或者是 rails 迁移错误。感谢您的帮助。

Answer 1

我通过更改迁移文件解决了这个问题：

class AddDealerIdToVehicleInventories < ActiveRecord::Migration
  def up
    add_reference 'vehicle.inventories', :dealer, index: true, foreign_key: {on_delete: :cascade}
  end

  def down
    execute <<-SQL
      ALTER TABLE vehicle.inventories
        DROP COLUMN dealer_id
    SQL
  end
end

希望这对其他人也有用。

Rails Postgres Schema 引用回滚问题

Rails Postgres Schema references rollback issue

ruby-on-rails

postgresql

database-schema

rails-migrations