Fix: handle multiple attachments file

[BoutValentin]

Hi 👋,

I'm currently using mail_form in a small project. In my use case, I have to handle multiple attachments in email. When I use your current last release of the code, multiple attachments are not being send. If I use only on attachment, everything works fine.

As I investigate,I found out that when multiple attachments file are use, the send method respond with an array of elements ActionDispatch::Http::UploadedFile. To handle this use case I made a fork of your projects and make small change in the deliver file. It seems to work as expected in Rails 6.1.4.1 with Ruby 3.0.0.

To be honest, I completely understand if this use case doesn't interested you and can stay with my current change in my own repo. I'm also a full beginner on the RoR frameworks and Ruby development and open to any discussion to improve the code I just propose to you.

Nice Day to everyone,
Thanks ❤️

[czepesch]

@BoutValentin thank you very much for that fix, I've installed mail_from using your repository and was able to send two files. Finally! <3

[carlosantoniodasilva]

@BoutValentin thanks for your PR, and apologies for the long delay here. I cherry-picked it into a new branch #78 and tweaked it a bit, adding a test as well. It seems to be working fine.

I'll be pushing it to master soon, if you or @czepesch are still able to give it a shot, feel free to try it then and let me know how it goes.

[czepesch]

@carlosantoniodasilva hello,
I checked. Can't send attachment when file field set to multiple: true. When I remove multiple, I'm able to send one file.

Maybe I'm missing something. It works for you?

[carlosantoniodasilva]

@czepesch it worked when I originally implemented it 😄... are you using the latest version v1.10.0, or maybe the main branch directly?

[czepesch]

@carlosantoniodasilva main branch at first, and now checked with exactly "1.10.0"
files: [] in permit params
attribute :files, attachment: true in the model
f.file_field :files, :type => "file", multiple: true in the form
should it be like this?

[carlosantoniodasilva]

@czepesch that's pretty much it... here's the diff on a sample app of the two changes I had to make:

diff --git a/app/controllers/contacts_controller.rb b/app/controllers/contacts_controller.rb
index ff2cf7d..0246d0f 100644
--- a/app/controllers/contacts_controller.rb
+++ b/app/controllers/contacts_controller.rb
@@ -4,7 +4,7 @@ class ContactsController < ApplicationController
   end

   def create
-    contact_params = params.require(:contact).permit(:name, :email, :message, :file)
+    contact_params = params.require(:contact).permit(:name, :email, :message, :file => [])
     @contact = Contact.new(contact_params)

     if @contact.deliver
diff --git a/app/views/contacts/new.html.erb b/app/views/contacts/new.html.erb
index 4d10a96..411742b 100644
--- a/app/views/contacts/new.html.erb
+++ b/app/views/contacts/new.html.erb
@@ -18,7 +18,7 @@
   </div>
   <div>
     <%= f.label :file %><br/>
-    <%= f.file_field :file %>
+    <%= f.file_field :file, multiple: true %>
   </div>

   <div>

That sent both files I uploaded successfully:

----==_mimepart_63e278569ca58_70401a4080d5
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

<h4 style="text-decoration:underline">Contact</h4>


  <p><b>Name:</b>
  Test</p>

  <p><b>Email:</b>
  carlos@test.com</p>

  <p><b>Message:</b>
  ZOMG</p>


----==_mimepart_63e278569ca58_70401a4080d5
Content-Type: text/plain;
 charset=UTF-8;
 filename=file1.txt
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename=file1.txt

This is file 1

----==_mimepart_63e278569ca58_70401a4080d5
Content-Type: text/plain;
 charset=UTF-8;
 filename=file2.txt
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename=file2.txt

This is file 2

----==_mimepart_63e278569ca58_70401a4080d5--

[czepesch]

hm... I just sent two files successfully too, but I don't remember changing anything, just ctl+Z to where it has been.. anyway.
Thanks!

[grgatzby]

Hi everyone,
I am a newby in development, but was so happy to find this post on multiple files.

In my small project, I have used the same model (namely : the Contact model) and form for two different purposes:

• one is a "contact us" feature where the user may attach multiple files (thanks to this post 🤗), and
• the other one handles a specific user request, where one file attachment is required (and one file only, which turned out handy for me).
  I could not see any means of using "required : true" together with "multiple: true", since when no file is attached, the output is an empty array [ ] which always satisfies 'required : true';

My turnaround was to :
1/ do an if/else test in the html view as per below:

<% if one_required_file_feature %>
  <!--- FORM FIELD: one attachment only -->
  <div>
    <%= f.file_field :files,
      class: 'btn buttons-shape',
      accept: 'text/csv,application/msword,application/vnd.ms-excel,application/pdf',
      required: true
    %>
  </div>
<% else %>
  <!--- FORM FIELD: multi files attachment for Contact us -->
  <div>
    <%= f.file_field :files,
      multiple: true,
      class: 'btn buttons-shape',
      accept: 'image/png,image/gif,image/jpeg,application/pdf'
    %>
  </div>
<% end %>

The first branch of my if else does not yield an array, and therefore properly handles the 'require: true' test

2/ tweak the strong params to handle both potential outputs, as per below
from
params.require(:contact).permit(:subject, :name, ... , files: [])
to
params.require(:contact).permit(:subject, :name, ... , :files, files: [])

3/ to be on the safe side I added 'validate: { presence: true }' in the model:
attribute :files, attachment: true, validate: { presence: true }

I would be keen to get some ideas on how to force one attachment with 'multiple: true,'.