如何获取其date_of_leaving为零的记录，或者它应该在特定的轨道日期范围内？

Question

我想写一个queryemployee模型，其中employeedate_of_leaving是nil或它应该在特定的date range。

这里是我当前的查询：

e = Employee.where.not('date_of_leaving >= ? and date_of_leaving <= ?', Date.today - 60, Date.today).where(:date_of_leaving => nil) 

但其返回#<ActiveRecord::Relation []>

Answer 1

下面的查询将返回里面有所有员工date_of_leaving要么nil之间的指定日期是：

Employee.where('date_of_leaving BETWEEN ? AND ? OR date_of_leaving IS NULL', Date.today - 60, Date.today)