如何在ActiveRecord Rails 4.1.1中使用OR？

Question

我使用了范围where(address: [nil, ''], city: [nil, ''])，我收到了请求

WHERE ((`address`.`address` = '' OR `address`.`address` IS
NULL) AND (`address`.`city` = '' OR `address`.`city` IS
NULL))

我需要将AND替换为OR。如何使用ActiveRecord构建查询？

Answer 1

你可以试试这个

where("address.address in (?) or address.city in (?)", [nil, ''])

在申请中

scope :empty_address, -> { where("address.address in (?) or address.city in (?)", [nil, '']) }
Address.empty_address

Answer 2

您可以使用Arel gem并形成如下查询：

ids = [nil，＆＃39;＆＃39;] Address.where(Address.arel_table[:address].in(ids).or(Address.arel_table[:city].in(ids)))

Arel-helpers你可以缩短它： Address.where(Address[:address].in(ids).or(Address[:city].in(ids)))