ruby on rails - Unable to get the Item details from Amazon production API -

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i using the gem item details. able except, item description, please suggest how can item description.please see screenshot want get. have selected description.

find configurations

gemfile 

 gem 'amazon_product', '~> 3.0', '>= 3.0.1'

services/amazon_service.rb

class amazonservice     def initialize(params)         @itempage = params[:itempage]         @keyword = params[:keyword]         @book_id = params[:book_id]         $req = amazonproduct['us']         $req.configure |c|         c.key    = env['aws_access_key_id']         c.secret = env['aws_secret_key']         c.tag    = env['associate_tag']     end     end     def itemlookup`enter code here`         $req << {         :operation    => 'itemlookup',         :search_index => 'books',         :keywords => 'book',         :idtype => 'isbn',         :itemid => @book_id,         :response_group => ['itemattributes','images'],      }     $req.get     end end

controller 

 @resp = amazonservice.new({book_id: 1338099132}).itemlookup

the product description stored under editorial reviews node. 

editorialreviews:     editorialreview:       source: product description       content: '<ul><li> front opening, long sleeve, pure color, patternless,         draped, scarf hem, stretch, loose style, textured, ruffled, </li><li>         model 5.2ft in height.</li></ul><table border="1" cellpadding="1"         cellspacing="1" width="200"><tr><td>asian size</td><td>international size</td><td>us         size</td><td>bust girth</td><td>waist girth</td><td>hip girth</td><td>arm

to need find source node 'product description' value

product.description = array.wrap(item.editorial_reviews).                       find{|er| er['source'] == 'product description'}.                       try(:fetch, 'content', nil)

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