Rails的ActiveRecord的::关系错误

本文介绍了Rails的ActiveRecord的::关系错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

展望上ActiveRcord查询键/列传递一个变量的值？

Looking into passing a variable as value on ActiveRcord query key/column?

login = Login.where("email_address" => "geo@bostj","active" => 1).select("id") => [#<Login id: 767>] login = Login.where("email_address" => "geo@bostj","active" => 1).select("id").class => ActiveRecord::Relation admin = Admin.where("login_id"=>login).exists?

Heeeelp

Heeeelp

推荐答案

您可以写为

login_ids = Login.where("email_address" => "geo@bostj","active" => 1).pluck(:id) Admin.where("login_id in (?)", login_ids).blank?

空白？

返回true，如果关系是空白。

Returns true if relation is blank.

Admin.where（login_id在（？），login_ids）还给我们的ActiveRecord ::关联对象，所以我觉得我们可以使用 #blank？方法。

Admin.where("login_id in (?)", login_ids) gives back us ActiveRecord::Relation object, so I think we can use #blank? method.