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Ruby on rails Rails中的Postgresql交叉数据库引用_Ruby On Rails_Activerecord_Ruby On Rails 4 - Fatal编程技术网
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Ruby on rails Rails中的Postgresql交叉数据库引用

ruby-on-rails activerecord ruby-on-rails-4

Ruby on rails Rails中的Postgresql交叉数据库引用,ruby-on-rails,activerecord,ruby-on-rails-4,Ruby On Rails,Activerecord,Ruby On Rails 4,我正在搜索，但遇到了一个跨数据库引用错误 activities = Activity.order(:name).includes([:profile => :country]) activities = activities.where("lower(activities.city) like ?", "%#{params[:activity_search][:city].downcase}%") unless params[:activity_search][:city] == ""

我正在搜索，但遇到了一个跨数据库引用错误

activities = Activity.order(:name).includes([:profile => :country])
activities = activities.where("lower(activities.city) like ?", "%#{params[:activity_search][:city].downcase}%") unless params[:activity_search][:city] == ""      
activities = activities.where("activities.sport_id =?", params[:activity_search][:sport_id])
我试图添加如下内容：

activities = activities.where("activities.profiles.country.id =?", params[:activity_search][:country_id])
活动的国家/地区与活动创建者的国家/地区相同

如何在查询中添加此约束

感谢您的帮助

您需要在此处使用
连接来包含关联：


activities.joins(profiles: :country).where('countries.id = ?', params[:whatever])


这假设
活动有多个：profiles
和
Profile有一个：country
和
countries
是您的表名，但根据您的帖子，我认为所有这些都是正确的。这将包括与
活动关联的
配置文件
和
国家/地区
，并允许您在
where
方法调用中使用它们的属性