ruby-on-rails - 如何在 Rails 查询中找到 nil 的对立面

Question

愉快地使用Mongoid并ActiveRecord喜欢这样：

Task.where(project_id: params[:project_id], archived_at: nil)
# find me the tasks for project_id that haven't been archived

但是说相反的直接方式是什么？

# find me the tasks for project_id that have been archived
# i.e. where archived_at is not nil

无法弄清楚或找出第一行代码的倒数。我认为它应该很简单:)

Answer 1

我想你想用这个：

:archived_at.ne => nil 

看看这里：MongoId-Matchers-NE