Rails/Ruby - 使用从另一个页面传递的数据预填充表单

Question

device当从rfid部分view/cabinet/show页面导航到新表单时,如何获取值以预填充新表单？ devicehas_one rfid.

来自橱柜/展示的链接:

<%= link_to "Create New Device (non-functional)", new_device_path({:id => @rfid.id, cabinet_id: @cabinet.id}), :class => "btn btn-primary" %>

的devices_controller,我想有create方法工作的时候是0或2 PARAMS传递:

def create(options)

if options[:cabinet_id] and options[:id]
  @rfid = Rfid.find(params[:id])
  @device = Device.new(params[:device])
  @device.rfid = @rfid
  @device.cabinet_id = :cabinet_id

else
  @device = Device.new(params[:device])
  @cabinet = Cabinet.find(params[:device][:cabinet_id])
  @device.row_id = @cabinet.row_id
end
  respond_to do |format|
    if @device.save and @cabinet.refresh_capacity_used and @cabinet.refresh_consumption
      format.html { redirect_to @device, notice: 'Device was successfully created.' }
      format.json { render json: @device, status: :created, location: @device }
    else
      format.html { render action: "new" }
      format.json { render json: @device.errors, status: :unprocessable_entity }
    end
  end

结束

新的cabinet_id和rfid部分device/_form:

<tr>
        <th>Cabinet</th>
        <td><%= f.select :cabinet_id, options_from_collection_for_select(Cabinet.order(:name).all, "id", "name", @device.cabinet_id) %></td>
</tr>


<tr>
        <th>RFID</th>
        <td><%= f.text_field :rfid, :value => params[:rfid]%></td> 
</tr>

谢谢.

Answer 1

如果你有:

<%= link_to "Create New Device (non-functional)", new_device_path({:id => @rfid.id, :cabinet_id => @cabinet.id}), :class => "btn btn-primary" %>

您可以使用以下方法预填充rfid和cabinet_id字段:

<%= f.select :cabinet_id, options_from_collection_for_select(Cabinet.order(:name).all, "id", "name", params[:cabinet_id]) %>

<%= f.text_field :rfid, :value => params[:id] %>

请注意,params键必须与传递到link_to标记中哈希值的值匹配.

Answer 2

@zeantsoi发布的答案大都可以，但是它破坏了编辑功能。作为修复，我建议进行以下较小的修改：

<%= f.select :cabinet_id, options_from_collection_for_select(Cabinet.order(:name).all, "id", "name", params[:cabinet_id] || @device.cabinet_id) %>

<%= f.text_field :rfid, :value => params[:rfid] || @device.rfid %>

这样，如果params[:cabinet_id]不存在，@device.cabinet_id（现有值）将持久存在。