Carrierwave multi-file upload Rails 5 not working

Question

In my rails app, I wish for the users to be able to upload multiple files at once.

I am using the carrierwave gem

gem 'carrierwave', github: 'carrierwaveuploader/carrierwave'

On the master branch which supposedly supports the multiple: true

found out in my internet searching desperation about the necessary addition of optional: true in my model for my attachment.

I'm using mysql so I can't use an array type in my database, but I've set up a has_many, belongs_to relationship between Request and Request_Attachment in my database.

my form:

<%= f.fields_for :request_attachments do |ra| %>
  <div class="row" id="uploader">
    <div class="col-xs-12">
      <label class="btn btn-info"> Upload Files
        <%= ra.file_field :file, multiple: true, name: "request_attachments[file][]", :style => "display: none" %>
      </label>
    </div>
  </div>
<% end %>

my controller

  @request = Request.new(request_params)

  if @request.save
    if params[:request][:request_attachments] 
      params[:request][:request_attachments]['file'].each do |f|
        @request_attachment = @request.request_attachments.create!(:file => f)
      end
    end
    flash[:success] = "Your request was submitted successfully, check your email for a confirmation message."
    redirect_to action: 'index', status: 303
  else
    render :new
  end

def request_params 
  params.require(:request).permit(:jobtitle, :requester, :status, request_attachments_attributes: [:id, :request_id, :file])
end

my models:

Request:

class Request < ApplicationRecord

  has_many :request_attachments
  accepts_nested_attributes_for :request_attachments
end

Request_Attachments:

class RequestAttachment < ApplicationRecord
  mount_uploader :file, FileUploader
  belongs_to :request, optional: true
end

I have tried variations of the form, like taking out the name portion.

When I remove the multiple: true portion, it will work perfectly, but it does not work with the multiple option.

I'm not quite sure where the issue may be, so any help would be great.

What is happening now is that the request gets saved, but

1. Only 1 request_attachment is created, and

2. The filename of the request_attachment is nil

Answer 1

Okay, I think I figured it out.

I made a couple changes, which threw an error, and I looked closely at the Parameter Hash, and I noticed essentially it looked like this:

{"utf8"=>"✓",
 "request"=>
  {"jobtitle"=>"Testing, again and again, and again",
   "request_attachments_attributes"=>
    {"0"=>
      {"file"=>
        [#<ActionDispatch::Http::UploadedFile:0x007fee9df806b8
           @content_type="image/gif",
           @headers="Content-Disposition: form-data; name=\"blah\"; filename=\"logo1.gif\"\r\nContent-Type: image/gif\r\n",
           @original_filename="logo1.gif",
           @tempfile=blah,
         #<ActionDispatch::Http::UploadedFile:0x007fee9df80690
           @content_type="image\gif",
           @headers=
       "Content-Disposition: form-data; name=\"blah\"; filename=\"Blah.gif\"\r\nContent-Type: image/gif\r\n",
           @original_filename="Blah.gif",
           @tempfile=blahblah]}}

I noticed the "0"=> and thought "wait.... what is that doing there?....

So I removed the name section in my form, and changed my controller to look like this:

if @request.save
    params[:request][:request_attachments_attributes]["0"]['file'].each do |f|
      @request_attachment = @request.request_attachments.create!(:file => f)
    end

And that seemed to have worked.