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I am having trouble initializing my model.

I am trying to build a model which takes a url_address string on initialization, utilizes DocRaptor to build a PDF, then uses pdf-reader to read data from that PDF, and finally remove the stored PDF.

When I have a blank model, I can save using Rails 5 forms, as per the introductory Rails 5 guide, here: https://guides.rubyonrails.org/getting_started.html

I built a new project from scratch using a postgresql database, and set about with the Guide. I was able to save models just fine with a blank UrlDataModel definition. However, when I edited my model to contain functionality necessary to retrieve the PDF and read it, I get a

NoMethodError - undefined method '[]' for nil:Class

I do know this error means that my model is empty, so I'm trying to troubleshoot how that happens.

The controller fails on

@url_data_model.save

My repo is here: https://github.com/blueMesaEngineering/Minotaur-hoof

Model follows here:

class UrlDataModel < ApplicationRecord
 attr_accessor :url_address, :pdf_version, :producer, :title, :metadata, :page_count

 def initialize(attributes = )
 @url_address = attributes[:url_address]
 @pdf_version = attributes[:pdf_version]
 @producer = attributes[:producer]
 @title = attributes[:title]
 @metadata = attributes[:metadata]
 @page_count = attributes[:page_count]
 end

 def after_initialize
 buildModelFromURLViaPDF
 end

 def buildModelFromURLViaPDF
 convertURLToPDF
 readPDFData
 deletePDF
 end

 def convertURLToPDF
 require 'bundler/setup'
 Bundler.require

 DocRaptor.configure do |dr|
 dr.username = 'YOUR_API_KEY_HERE' # this key works for test documents
 # dr.debugging = true
 end

 $docraptor = DocRaptor::DocApi.new

 begin
 logPathName = './storage/Logs/standardOutput/output.txt'
 errorLogPathName = './storage/Logs/Error/'
 pathName = './storage/PDFs/'
 # url = "http://docraptor.com/examples/invoice.html"
 url = 'http://www.docraptor.com'
 @url_address = url

 fileNamePDF = 'docraptor-ruby.pdf'

 create_response = $docraptor.create_async_doc(
 test: true, # test documents are free but watermarked
 document_url: url, # or use a url
 name: fileNamePDF, # help you find a document later
 document_type: 'pdf' # pdf or xls or xlsx
 )

 loop do
 status_response = $docraptor.get_async_doc_status(create_response.status_id)

 # puts "doc status: #status_response.status"

 case status_response.status

 when 'completed'
 doc_response = $docraptor.get_async_doc(status_response.download_id)
 File.open('./storage/PDFs/docraptor-ruby.pdf', 'wb') do |file|
 file.write(doc_response)
 end
 # puts "Wrote PDF to " + pathName + fileNamePDF

 break

 when 'failed'

 # puts "FAILED"
 # puts status_response
 break

 else

 sleep 1

 end
 end
 rescue DocRaptor::ApiError => error
 # puts "#error.class: #error.message"
 # puts error.code # HTTP response code
 # puts error.response_body # HTTP response body
 # puts error.backtrace[0..3].join("n")
 end
 end

 def readPDFData
 require 'rubygems'
 require 'pdf/reader'

 fileName = './storage/PDFs/docraptor-ruby.pdf'

 PDF::Reader.open(fileName) do |reader|
 @pdf_version = reader.pdf_version
 # @producer = reader.producer
 # @title = reader.title
 @metadata = reader.metadata
 @page_count = reader.page_count
 end
 end

 def deletePDF
 require 'fileutils'

 FileUtils.rm_rf('./storage/PDFs/docraptor-ruby.pdf')
 end
end

Penny for your thoughts? I'm on here for the rest of the evening, so I will be able to respond directly. Thank you for taking a look!

Cheers.

Controller: https://pastebin.com/QVaHCMep

Stack Trace: https://pastebin.com/uQbXgiaH