Question

我试图按客户公司名称订购我的所有项目，但我收到此错误：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

您需要使用references编写它。

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

如何命令关联列不区分大小写

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