如何命令关联列不区分大小写

Question

我正在尝试按客户公司名称订购我的所有项目,但是我收到了这个错误:PG::UndefinedTable: ERROR: missing FROM-clause entry for table "customers" LINE 1: ... WHERE "projects"."archived" = $1 ORDER BY LOWER(customers.... ^ : SELECT "projects".* FROM "projects" WHERE "projects"."archived" = $1 ORDER BY LOWER(customers.company) ASC.

这是我到目前为止尝试的方式:

projects = Project.includes(:customer).order("LOWER(customers.company) ASC")

如果我遗漏LOWER(…)一切正常.

Answer 1

你需要用它来写references.

Project.includes(:customer)
       .order("LOWER(customers.company) ASC")
       .references(:customers)