Ruby On Rails:form_for上的file_field的示例 [英] Ruby On Rails: example of file_field on form_for

问题描述

我在Rails中遇到文件上传问题.我找到了file_field :file助手，可以与form_for(@some_model)一起使用.但是，在这种情况下，我找不到任何用法，因为这些标签用于通过批量分配来创建/编辑某些模型. AFAIK无法将文件上传视为典型字段(请参阅

I came across file uploading problem in Rails. I found file_field :file helper, that can be used with form_for(@some_model). However, I cannot find any usage for this case, as those tags are used to create/edit some model, by mass assigning. There is, AFAIK, no possibility to treat fileupload as typical field ( See File upload won't work in Ruby on Rails 3 using Multipart Form ). In such a case, manual operation on uploaded file is required. So, why would someone even want to puts a fileupload as a part of model editing?

photo.rb

   class Photo < ActiveRecord::Base
       attr_accessible :name, :filename,
   end

photo_form.html.erb

photo_form.html.erb

<%= form_for(@photo, :multipart => true) do |f| %>

  <%= f.label :name %> 
  <%= f.text_field :name %>

  <%= f.file_field :file %>

  <%= f.submit %>

<% end %>

photos_controller.rb

photos_controller.rb

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

上面的

行失败了，因为没有:file属性.必须在:params之前对其进行处理并手动将其删除.再说一次-这些标签有实际用途吗?

line above fails, because theres no :file attribute. It must be handled before and manually removed from :params. Once more - is there any real usage for such tags?

推荐答案

我记得我用它在Rails中上传xml文件

I remember that I used this to upload a xml file in Rails

视图:

<%= form_tag({action: :upload}, multipart: true) do %>
   <%= file_field_tag 'xml_file' %>
   <%= submit_tag 'Submit' %>
<% end %>

控制器:

def upload
    file_data = params[:xml_file]
end

它正在使用form_tag，但也很难在该表单中添加其他信息.

It is using form_tag but it would not be hard to add other info into that form also.

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