字符串的未定义方法`original_filename' [英] undefined method `original_filename' for String

问题描述

我正在尝试在不使用诸如 paperclip 之类的 gem 的情况下实现 csv 上传功能.这是视图:

I'm trying to implement a csv upload functionality WITHOUT using gems such as paperclip. Here's the view:

 %h1 Add Users From CSV
 = form_tag(:action => "upload",:multipart => true,:method => :post) do
   = file_field_tag 'csv'
   = submit_tag 'Upload'

这是控制器:

def upload
  csv_io = params[:csv]

  File.open(Rails.root.join('public', 'uploads', csv_io.original_filename), 'wb') do |file|
    file.write(csv_io.read)
  end

  redirect_to root_path, :notice => "Successfully uploaded csv!"
end

但是当我上传名为 data.csv

undefined method `original_filename' for "data.csv":String

我只是按照官方的 Rails 指南进行操作，但仍然出现错误.任何人都可以提出一些解决方案吗?

I just followed the official Rails guide, but it's still getting error. Can anyone suggest some solutions?

注意:我只需要从 csv 文件中读取数据，不需要持久保存在服务器上.

NOTE: I just need to read data from the csv file and it does not need to be saved persistently on server.

推荐答案

您将参数传递给 form_tag 的方式，您的所有参数都被视为第一个 form_tag 的一部分 参数 url_for_options，而不是部分转到第二个参数 options(参见 http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#method-i-form_tag方法定义).

The way you're passing the arguments to form_tag, all your arguments are getting treated as part of the first form_tag parameter url_for_options, instead of going in part to the second parameter options (see http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#method-i-form_tag for the method definition).

根据 http://guides.rubyonrails.org/form_helpers.html# 上的指南上传文件，您可以使用以下语法来实现您想要的:

Per the guide at http://guides.rubyonrails.org/form_helpers.html#uploading-files, you can use the following syntax to achieve what you want:

form_tag({:action => "upload"},:multipart => true)

您不需要设置:method，因为它默认为post.

You don't need to set :method because it defaults to post.

这篇关于字符串的未定义方法`original_filename'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！