从ActiveRecord范围中删除订单

Question

我正在使用rails ransack(https://github.com/ernie/ransack)来允许用户过滤和排序某些记录.我使用传统方法获取过滤和排序的记录.

 @invoices = Invoice.search(params[:q]).result

现在我想得到一些摘要信息,所以我有

 @invoices = Invoice.search(params[:q]).result
 @summary = @invoices.select("sum(balance) as balance_total").first

除非用户指定要排序的字段.我收到SQL错误:

 Column "project_name" is invalid in the ORDER BY clause because 
 it is not contained in either an aggregate function or the GROUP BY clause

我可以从范围中删除排序吗？怎么样？

谢谢

Answer 1

您可以使用空字符串调用重新排序方法.例如:

> Article.order('headline asc').to_sql
=> "SELECT `articles`.* FROM `articles`  ORDER BY headline asc"
> Article.order('headline asc').reorder('').to_sql
=> "SELECT `articles`.* FROM `articles` "