Rails的ActiveRecord的::关系错误 [英] Rails ActiveRecord::Relation error
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.com","active" => 1).select("id")
=> [#<Login id: 767>]
login = Login.where("email_address" => "geo@bostj.com","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.com","active" => 1).pluck(:id)
Admin.where("login_id in (?)", login_ids).blank?
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.
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