Ruby On Rails: example of file_field on form_for

Question

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

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

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

  <%= f.file_field :file %>

  <%= f.submit %>

<% end %>

photos_controller.rb

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

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?

Hey, if you have got any idea of how to achieve file uploading using form_for while having other fields and labels, please share it here. Even I'm trying to make this work. — learner
– learner, Commented Feb 19, 2015 at 7:27
What happens if you try attr_accesible :name, :file and in your view <%= f.file_field :filename %>? — vich
– vich, Commented Mar 24, 2015 at 4:23

Touqeer · Accepted Answer · 2024-11-06 10:01:41Z

6

I will give you an example of how I am using it, I think it explains itself good enough, I hope this helps

 <%= form_for @item do |f|%>
    <%= f.file_field :photo, accept: 'image/png,image/jpeg'%>
 <% end %>

Let me know if you have any doubts

edited Nov 6, 2024 at 10:01

Touqeer

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answered Oct 9, 2016 at 0:04

Jose Rafael

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Comments

vishless · Accepted Answer · 2017-04-25 22:37:30Z

5

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

view:

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

controller:

def upload
    file_data = params[:xml_file]
end

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

edited Apr 25, 2017 at 22:37

vishless

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answered Apr 10, 2015 at 20:02

inimene

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