Ruby on Rails

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:

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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 |

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

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

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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