```ruby
require 'googlebooks'

class GoogleBookData < ActiveRecord::Base
  belongs_to :book

  def self.book_from_isbn(isbn)
    GoogleBookData.new(
        description:   "",
        img_thumbnail: "",
        img_small:     "",
        img_medium:    "",
        img_large:     "",
        preview_link:  ""
      ).update_data(isbn)
  end

  def update_data(isbn = self.book.isbn)
    results =  GoogleBooks.search("isbn:#{isbn}")

    if results.total_items > 0
      google_book = results.first
      self.description   = google_book.description.to_s
      self.img_thumbnail = google_book.image_link(zoom: 5).to_s
      self.img_small     = google_book.image_link.to_s
      self.img_medium    = google_book.image_link(zoom: 2).to_s
      self.img_large     = google_book.image_link(zoom: 3).to_s
      self.preview_link  = google_book.preview_link.to_s
    end

    self
  end

  def self.update_all_null
    GoogleBookData.where(description: "").each{|i| i.update_data.save}
  end

end
```

Allow for usage of a api key with google books
user
```ruby
require 'googlebooks'

class GoogleBookData < ActiveRecord::Base
  belongs_to :book

  def self.book_from_isbn(isbn)
    GoogleBookData.new(
        description:   "",
        img_thumbnail: "",
        img_small:     "",
        img_medium:    "",
        img_large:     "",
        preview_link:  ""
      ).update_data(isbn)
  end

  def update_data(isbn = self.book.isbn)
    results =  ENV['ALEXANDRIA_SIMPLE'].blank? ?
                  GoogleBooks.search("isbn:#{isbn}") :
                  GoogleBooks.search("isbn:#{isbn}", {api_key: ENV['ALEXANDRIA_SIMPLE']})

    if results.total_items > 0
      google_book = results.first
      self.description   = google_book.description.to_s
      self.img_thumbnail = google_book.image_link(zoom: 5).to_s
      self.img_small     = google_book.image_link.to_s
      self.img_medium    = google_book.image_link(zoom: 2).to_s
      self.img_large     = google_book.image_link(zoom: 3).to_s
      self.preview_link  = google_book.preview_link.to_s
    end

    self
  end

  def self.update_all_null
    GoogleBookData.where(description: "").each{|i| i.update_data.save}
  end

end
```
assistant