Question

我想编写一个脚本来检查相应的记录是否存在。如果不是我想删除参考记录。

我是红宝石的新手。

    if Hotload.find(lead.id).exists?
      leadid = Lead.find(lead.id)
      leadid.destroy
    end

错误消息：

ActiveRecord::RecordNotFound (Couldn't find Hotload with id=148):
app/controllers/users_controller.rb:64:in `block in leads'
app/controllers/users_controller.rb:47:in `leads'

更新：

这是完整的功能：

  def leads
    load_leads = []
    truck_leads = []
    hotload_leads = []
    #I just added another route for users/:id/leads and kept users/leads because I wasn't sure if it was used anywhere else.
    @leads = Lead.where(:user_id => params[:id] || current_user.id)
    @leads.each do |lead|
      if lead.post_type == 'load'
        load_leads.push lead.type_id
      elsif lead.post_type == 'truck'
        truck_leads.push lead.type_id
      elsif lead.post_type == 'hotload'
        hotload_leads.push lead.type_id
        unless Hotload.where(:id => lead.id).exists?
          lead_id = Lead.find(lead.id)
          lead_id.destroy
        end
      end
    end  
    @saved_loads = Load.find(load_leads, :order => "#{sort_load_column + " " + sort_direction}").paginate(:page => params[:load_leads_page], :per_page => 10)
    @saved_trucks = Truck.find(truck_leads,:order => "#{sort_truck_column + " " + sort_direction}").paginate(:page => params[:truck_leads_page], :per_page => 10)
    @saved_hotloads = Hotload.find(hotload_leads,:order => "#{sort_load_column + " " + sort_direction}").paginate(:page => params[:hotload_leads_page], :per_page => 10)
  end

立即出错

ActiveRecord::RecordNotFound (Couldn't find all Hotloads with IDs (1590, 1479, 1478, 1468, 1476) (found 4 results, but was looking for 5)):
  app/controllers/users_controller.rb:62:in `leads'

Answer 1

如果查看find的{{3}}，您会发现如果找不到一个或多个ID，就会出现错误。

请尝试使用where。

if Hotload.where(:id => lead.id).exists?
  lead_id = Lead.find(lead.id)
  lead_id.destroy
end

Answer 2

您应该将代码更改为

if Hotload.find_by(id: lead.id).blank?
  leadid = Lead.find(lead.id)
  leadid.destroy
end

如果未找到相关记录，则销毁记录

2 个答案: