Rails：如何从哈希迭代产品？ （亚马逊API /真空吸尘器）

扩展Rails：如何从哈希中提取值？ （亚马逊API /真空吸尘器） – 如何将这些新挖出的值用于我的视图？

目前获得 ：

undefined method `image_url' for # Extracted source (around line #5):  

main_controller.rb ：

 class MainController < ApplicationController def index request = Vacuum.new('GB') request.configure( aws_access_key_id: 'ABCDEFGHIJKLMNOPQRST', aws_secret_access_key: '', associate_tag: 'lipsum-20' ) params = { 'SearchIndex' => 'Books', 'Keywords'=> 'Ruby on Rails', 'ResponseGroup' => "ItemAttributes,Images" } raw_products = request.item_search(query: params) hashed_products = raw_products.to_h # puts hashed_products['ItemSearchResponse']['Items']['Item'].collect{ |i| i['ItemAttributes']['Title'] } # puts hashed_products['ItemSearchResponse']['Items']['Item'].collect{ |i| i['DetailPageURL'] } # puts hashed_products['ItemSearchResponse']['Items']['Item'].collect{ |i| i['LargeImage']['URL'] } @products = [] @products = hashed_products['ItemSearchResponse']['Items']['Item'].each do |item| product = OpenStruct.new product.name = item['ItemAttributes']['Title'] product.url = item['DetailPageURL'] product.image_url = item['LargeImage']['URL'] @products << product end end end 

index.html.erb ：

 
Products from Amazon Product Advertising API
   
   
   

Answer 1

我不会将整个亚马逊哈希变成OpenStruct 。 由于product.name nil ，因此无法对其进行查找。

相反，只需遍历Amazon项目，将它们分配给您的产品，然后添加到@products数组：

 @products = [] hashed_products['ItemSearchResponse']['Items']['Item'].each do |item| product = OpenStruct.new product.name = item['ItemAttributes']['Title'] @products << product end