Ruby on rails 获取rails控制器中Carrierwave上载的文件名

我需要在我的控制器中获取文件名和上载的文件，以便在用户未指定标题（或名称）的情况下为上载的文件设置默认标题（或名称）。我使用Carrierwave上传文件

我的控制器创建操作如下所示：

  def create
    @photo = Photo.new(params[:photo])
    @photo.user_id = current_user.id


    respond_to do |format|
      if @photo.save
        format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
        format.json { render action: 'show', status: :created, location: @photo }
      else
        format.html { render action: 'new' }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

  def create
    @photo = Photo.new(params[:photo])
    @photo.user_id = current_user.id

    @photo.name =  @photo.image.file.filename if @photo.name == ""

    respond_to do |format|
      if @photo.save
        format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
        format.json { render action: 'show', status: :created, location: @photo }
      else
        format.html { render action: 'new' }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

---

解决方案是从carrierwave文件中获取文件名，如下所示：

  def create
    @photo = Photo.new(params[:photo])
    @photo.user_id = current_user.id


    respond_to do |format|
      if @photo.save
        format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
        format.json { render action: 'show', status: :created, location: @photo }
      else
        format.html { render action: 'new' }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

  def create
    @photo = Photo.new(params[:photo])
    @photo.user_id = current_user.id

    @photo.name =  @photo.image.file.filename if @photo.name == ""

    respond_to do |format|
      if @photo.save
        format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
        format.json { render action: 'show', status: :created, location: @photo }
      else
        format.html { render action: 'new' }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end