在Mongoid中使用AND和OR的组合

Question

我想构建一个表单的查询:

select * from some_table
where 
  (field1 = 'x' or field2 = 'y') 
  and 
  (field3 = 'z' or field4 = 'w')

从阅读文档,我认为它应该看起来像这样Mongoid:

SomeTable.or({:field1 => 'x'}, {:field2 => 'y'})
         .and  #  or is it .intersect?
         .or({:field3 => 'z'}, {:field4 => 'w'})

但那不起作用 - mongo选择器只是所有字段的"$或".这样做的正确方法是什么？谢谢.

我也很欣赏它的反转,例如 - 如何执行此查询:

select * from some_table
where 
  (field1 = 'x' and field2 = 'y') 
  or
  (field3 = 'z' and field4 = 'w') 

Answer 1

看来我需要使用mongo和Mongoid语法的组合($something运算符):

SomeTable.and( :$or => [ { :field1 => 'x' }, { :field2 => 'y' } ])
         .and( :$or => [ { :field3 => 'z' }, { :field4 => 'w' } ]) 

反过来就是替换运算符:

SomeTable.or( :$and => [ { :field1 => 'x' }, { :field2 => 'y' } ])
         .or( :$and => [ { :field3 => 'z' }, { :field4 => 'w' } ]) 

希望这有助于某人:)