Question

我有一个带有已注册天线的表，我想将它们与访问控制相关联，每个天线只能有一个访问控制，但是访问控制可以有很多天线，我想仅用没有安装在控件访问权限中，但我不知道该怎么做。这是我到目前为止的内容：

module Admin::AntennaReaderRfidsHelper
  def antennas_for_select

    antenas_rfid = AntennaReaderRfid.all
    antenas_installed = AntennaInstalled.all

    antenas_rfid.map do | antena |
      antenas_installed.map do | instalada |

        if antena.id != instalada.antenna_reader_rfid_id
          puts antena.id
        else
          puts antena.id
        end

      end
    end
  end
end

<%= f.select(:antenna_reader_rfid_id, antennas_for_select, { include_blank: '' }, { class: 'form-control' }) %>

Answer 1

假设name是AntennaReaderRfid中的column_name

在controller＃action

中

@options_antennas_for_select =  AntennaReaderRfid.where
                                                .not("id IN (?)", AntennaInstalled.pluck(:antenna_reader_rfid_id))
                                                .pluck(:name, :id)

可见

<%= f.select(:antenna_reader_rfid_id, @options_antennas_for_select,  {prompt: "Select"}, {class: 'form-control', required: true}) %>

在Ruby on Rails中按ID筛选选择

1 个答案: