TypeError: no implicit conversion of Symbol into Hash when submitting form to upload files

I’m currently new to Rails and Ruby and I’m trying to learn from my
mistakes, this time I’m trying to upload 2 files from a form for later
processing, however, after I hit the “Submit” button. I keep getting
this
error:

TypeError in UploadFilesController#create

app/controllers/upload_files_controller.rb:28:in new' app/controllers/upload_files_controller.rb:28:increate’

Request

Parameters:

{“utf8”=>“✓”,
“authenticity_token”=>“2JJGtRXjWCZlPNhQdx6wOW4xvTseiRaXNylnUYvA5v4=”,
“upload_files”=>{“inventory”=>#<ActionDispatch::Http::UploadedFile:0x2fd8940
@original_filename=“1_Inventory.xlsx”,
@content_type=“application/vnd.openxmlformats-officedocument.spreadsheetml.sheet”,
@headers=“Content-Disposition: form-data;
name=“upload_files[inventory]”;
filename=“1_Inventory.xlsx”\r\nContent-Type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\r\n”,
@tempfile=#Tempfile:C:/Users/V80042~1/AppData/Local/Temp/RackMultipart20130930-9236-qiqijn>,
“material_list”=>#<ActionDispatch::Http::UploadedFile:0x2fe3cf8
@original_filename=“2_Material_List.xlsx”,
@content_type=“application/vnd.openxmlformats-officedocument.spreadsheetml.sheet”,
@headers=“Content-Disposition: form-data;
name=“upload_files[material_list]”;
filename=“2_Material_List.xlsx”\r\nContent-Type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\r\n”,
@tempfile=#Tempfile:C:/Users/V80042~1/AppData/Local/Temp/RackMultipart20130930-9236-g22588>},
“commit”=>“Upload”}

My upload_files_controller:

class UploadFilesController < ApplicationController
def new
@uploadFiles = UploadFiles.newend

def create
@uploadFiles = UploadFiles.new(params[:upload_files])end

Models:

Upload_Files:

class UploadFiles < ActiveRecord::Base
attr_accessible :inventory, :material_list
has_one :inventory
has_one :material_list
has_attached_file :inventory, :material_list

def new
{
“name” => read_attribute(:upload_file_name),
“size” => read_attribute(:upload_file_size),
“url” => upload_file.url(:original),
“delete_url” => upload_file_path(self),
“delete_type” => “DELETE”
}
endend

Inventory:

class Inventory < ActiveRecord::Base
belongs_to :upload_filesend

Material List:

class MaterialList < ActiveRecord::Base
belongs_to :upload_filesend

_form:

<%= form_for :upload_files do |f| %>

Upload Inventory

<%=
f.file_field :inventory %>

Upload Product List

<%= f.file_field
:material_list %>

<%= f.submit “Upload” %>
<% end %>

Could you please tell me what am I doing wrong and how to fix it? Thank
you
in advance.

Note: In case you haven’t noticed, I’m using paperclip and rails 3.x.x

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