整数的Ruby数组映射

Question

我有这个Rails 3.1 ActiveRecord查询：

Show.where('event_id = ? AND id not in (?)', params[:event_id], @dog.show_entries.map(&:show_id).join(','))

@dog.show_entries.count == 1时工作正常。如果它有更多我生成SQL的问题，那就是：

SELECT "shows".* FROM "shows" WHERE (event_id = 1 AND id not in ('2,1')) ORDER BY date ASC

如何阻止它将2,1括在引号中？

Answer 1

放弃join(',')：

Show.where('event_id = ? AND id not in (?)', params[:event_id], 
  @dog.show_entries.map(&:show_id))