如何在ActiveRecord Rails 4.1.1中使用OR？

Question

我習慣範圍where(address: [nil, ''], city: [nil, ''])，我得到的請求

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

我需要更換AND到OR。如何使用ActiveRecord構建查詢？

Answer 1

你可以試試這個

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

在應用

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

Answer 2

您可以使用Arel gem，形成你查詢，如：

IDS =零， ''] Address.where(Address.arel_table[:address].in(ids).or(Address.arel_table[:city].in(ids)))

與Arel-helpers你可以使它更短： Address.where(Address[:address].in(ids).or(Address[:city].in(ids)))