Rails窗體上傳文件到目錄 - 未定義的方法

Question

我試圖創建一個表單，將PDF和圖像上傳到目錄。目前，我有這個代碼，我已經複製過一個工作示例：

def resources_addprocess 

    r = Resource.new 
    r.title = params[:title] 
    r.reference = params[:reference] 
    r.description = params[:description] 
    r.campaign = params[:campaign] 
    r.resourcetype = params[:resourcetype] 

    uploaded_io = params[:file] 
    File.open(Rails.root.join('public','resources', uploaded_io.original_filename), 'wb') do |file| 
    file.write(uploaded_io.read) 
    end 
    if params[:preview].present? 
    uploaded_io2 = params[:preview] 
    File.open(Rails.root.join('app','assets','images','preview', 'resources', uploaded_io2.original_filename), 'wb') do |file| 
     file.write(uploaded_io2.read) 
    end 
    r.preview = uploaded_io2.original_filename 
    end 
    r.file = uploaded_io.original_filename 

    if r.save 
    flash[:success] = "You successfully added a resource." 
    redirect_to "/cms/resources" 
    else 
    flash[:error] = "resource wasn't successfully." 
    redirect_to "/cms/resources" 
    end 
end 

，但我得到了以下錯誤：undefined method 'original_filename'這個工作在不同的項目..不知道它爲什麼不呢？

Answer 1

找到了答案只是發佈此之後，

事實證明，如果你使用=form_tag你需要定義它的多..

http://guides.rubyonrails.org/form_helpers.html#uploading-files