如何将order与uniq一起使用？
auction.invoices.get_auction_invoices.item_invoices.
joins("INNER JOIN users ON users.id = invoices.usable_id").order("users.first_name").uniq
以上查询给出了以下错误：
这是我的范围
范围：item_invoices， - ＆gt; {joins（：invoice_details）.where（＆＃34; invoice_details.invoiceable_type =？＆＃34;，＆＃34; Item＆＃34;）}
范围：get_auction_invoices， - ＆gt; {where（：id =＆gt;（item_invoices.skip_cancelled_invoice + donators.skip_cancelled_invoice））}
PG :: InvalidColumnReference：错误：对于SELECT DISTINCT，ORDER BY表达式必须出现在选择列表中 第1行：... oice_details.invoiceable_type =＆＃39;项目＆＃39;）ORDER BY users.firs ... ：SELECT DISTINCT＆＃34;发票＆＃34;。* FROM＆＃34;发票＆＃34; INNER JOIN＆＃34; invoice_details＆＃34; ON＆＃34; invoice_details＆＃34;。＆＃34; invoice_id＆＃34; =＆＃34;发票＆＃34;。＆＃34; id＆＃34; INNER JOIN用户ON users.id = invoices.usable_id WHERE＆＃34;发票＆＃34;。＆＃34; eventable_id＆＃34; = $ 1 AND＆＃34;发票＆＃34;。＆＃34; eventable_type＆＃34; = $ 2 AND＆＃34;发票＆＃34;。＆＃34; id＆＃34; IN（1132,1131,777,777,777,3013,3024,3024,3024,3024,3041,3041,3013）AND（invoice_details.invoiceable_type =＆＃39; Item＆＃39;）ORDER BY users.first_name
答案 0 :(得分：1)
试试这个：
auction.invoices.get_auction_invoices.item_invoices.\
select("invoices.*, users.*").\
joins("INNER JOIN users ON users.id = invoices.usable_id").\
order("users.first_name").\
uniq