Ruby on rails Rails从ActiveRecord:：关系查询中删除模型

从查询中动态删除模型的最佳方法是什么？基本上，我想找到用户尚未提供响应的所有活动

下面的方法

delete\u at

实际上删除了我不想要的模型。我只想从我得到的本地“活动”

ActiveRecord:：Relation

查询集中删除它

def self.appuser_campaigns appuser_id, language
        appuser = Appuser.find(appuser_id)

        campaigns = Campaign.check_language language
        i = -1
        campaigns.each do |campaign|
            i = i + 1
            responses = Response.where(appuser_id: appuser_id, campaign_id: campaign.id)
            if responses.length > 0
                campaigns.delete_at(i)
            end
        end
        puts campaigns.class.name #"ActiveRecord::Relation" 

        campaigns
    end

    def self.check_language language
        campaigns = Campaign.where(language: language, status: "In Progress")
    end

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您可以执行以下操作：

already_answered_campaign_ids = Appuser.find(appuser_id).responses.pluck(:campaign_id)
Campaign.where('id NOT IN (?)', already_answered_campaign_ids.presence || -1)

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你能把你的模特和关系贴出来吗。您想在特定用户没有响应的地方使用它吗？我之前的回答将帮助您：