Rails - Jan 2014 - Not able to save PDF Kit file to a Paperclip attachment in Rails 3.2.15

I am trying to save a pdf file (generated using Rails PDFKit gem) to a
paperclip attachment. The MySQL table entry shows following for the
paperclip attachment after saving the generated PDF file:

*MySQL table record:*

*************

id | resume_type | resume_attachment_file_name | resume_attachment_content_type
| resume_attachment_file_size | resume_attachment_updated_at

*1   | pdf   |   !ruby/object:File {}   |   NULL   |   NULL |   NULL |*

**************

as against expected value to be something like in this format:

*resume.pdf | application/pdf | 38375 | 2014-01-30 18:24:34*

****************

Can someone please tell me what's going wrong here?

*Controller:*

html = render_to_string('resume.html.erb',layout: false)
kit = PDFKit.new(html, :page_size => 'Letter')

file_name = "resume"

path = "#{Rails.root}/app/assets/PDF/" + file_name.to_s +
".pdf"**file** = kit.to_file(path)

document = Document.new(:resume_type=>"pdf")
document.resume_attachment_file_name = **file**
document.save!

 *schema.rb*

create_table "documents", :force => true do |t|
t.string   "resume_type"
t.string   "resume_attachment_file_name"
t.string   "resume_attachment_content_type"
t.integer  "resume_attachment_file_size"
t.datetime "resume_attachment_updated_at"

 Thanks.

Regards,

Ankur

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