扶手：如何遍历产品从哈希？ （亚马逊API /真空） [英] Rails: How to iterate over products from hash? (Amazon API / Vacuum)

问题描述

扩展在<一个href="http://stackoverflow.com/questions/23416647/rails-how-to-extract-values-from-hash-amazon-api-vacuum">Rails:如何提取哈希值？ （亚马逊API /真空） - ？我怎么提供给我的意见，这些新挖出来的值

目前越来越

 未定义的方法`IMAGE_URL'的＃＆LT;哈希：0x848402e0＆GT;

提取的源（左右线5＃）：
＆其中;％=的link_to image_tag（product.image_url），product.url％​​GT;
 

main_controller.rb

 类MainController＆LT;的ApplicationController
  高清指数
    请求= Vacuum.new（'国标'）

    request.configure（
      aws_access_key_id：ABCDEFGHIJKLMNOPQRST，
      aws_secret_access_key：'＆LT;长期混乱的关键＆GT;'，
      associate_tag：lipsum-20
    ）

    PARAMS = {
      SearchIndex'=＆GT; '图书'，
      '关键词'=＆GT; Ruby on Rails的'，
      ResponseGroup'=＆GT; ItemAttributes中，图像
    }

    raw_products = request.item_search（查询：​​PARAMS）
    hashed_products = raw_products.to_h

    ＃把hashed_products ['ItemSearchResponse'] ['商品'] ['项目']收集{|。我|我['ItemAttributes中'] ['标题']}
    ＃把hashed_products ['ItemSearchResponse'] ['商品'] ['项目']收集{|。我|我['DetailPageURL']}
    ＃把hashed_products ['ItemSearchResponse'] ['商品'] ['项目']收集{|。我|我['LargeImage] [网址]}

    @products = []

    @products = hashed_products ['ItemSearchResponse'] ['商品'] ['项目']每做|。项目|
      产品= OpenStruct.new
      product.name =项目['ItemAttributes中'] ['标题']
      product.url =项目['DetailPageURL']
      product.image_url =项目['LargeImage'] ['URL']

      @products＆LT;＆LT;产品
    结束
  结束
结束
 

index.html.erb

 ＆LT; H1＆GT;从亚马逊商品广告API＆LT产品; / H1＆GT;
＆LT;％@如果products.any？ ％＆GT;
  ＆LT;％@ products.each办|产品| ％＆GT;
    ＆LT; D​​IV CLASS =产品＆GT;
      ＆其中;％=的link_to image_tag（product.image_url），product.url％​​GT;
      ＆其中;％=的link_to product.name，product.url％​​GT;
    ＆LT; / DIV＆GT;
  ＆LT;％结束％GT;
＆LT;％结束％GT;
 

解决方案

我不会把整个亚马逊散列成 OpenStruct 。而且，由于 product.name 是零你不能在上面做一个查找。

相反，通过亚马逊的项目只是循环，将它们分配给您的产品，然后添加到 @products 数组：

  @products = []
hashed_products ['ItemSearchResponse'] ['商品'] ['项目']每做|。项目|
  产品= OpenStruct.new
  product.name =项目['ItemAttributes中'] ['标题']
  @products＆LT;＆LT;产品
结束
 

Expanding on Rails: How to extract values from hash? (Amazon API / Vacuum) -- how do I make these newly dug up values available to my views?

Currently getting:

undefined method `image_url' for #<Hash:0x848402e0>

Extracted source (around line #5):
<%= link_to image_tag(product.image_url), product.url %> 

main_controller.rb:

class MainController < ApplicationController
  def index
    request = Vacuum.new('GB')

    request.configure(
      aws_access_key_id: 'ABCDEFGHIJKLMNOPQRST',
      aws_secret_access_key: '<long messy 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:

<h1>Products from Amazon Product Advertising API</h1>
<% if @products.any? %>
  <% @products.each do |product| %>
    <div class="product">
      <%= link_to image_tag(product.image_url), product.url %>
      <%= link_to product.name, product.url %>
    </div>
  <% end %>
<% end %>

解决方案

I wouldn't turn the entire Amazon hash into an OpenStruct. And since product.name is nil you can't do a find on it.

Instead, just loop through the Amazon items, assign them to your product, and then add to the @products array:

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

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