有没有区别
User.count
和
User.count(:all)
我将rails升级到4.0,然后当我使用ModelName.count(:all)
它时运行良好,但如果我使用ModelName.count
会出现以下错误。顺便说一下,它们的bot在rails 3.2中运行良好
SELECT COUNT() FROM "users"
PG::WrongObjectType: ERROR: count(*) must be used to call a parameterless aggregate function
LINE 1: SELECT COUNT() FROM "users"