Ruby on rails 在view或index.html.erb中同时显示嵌套属性

我有一个带有大多数属性的产品模型，并且与我的产品图像模型有很多关系。所有的更新、编辑等工作都很有魅力，但我很难将数据导入前端引导主题

我想做的是让最后5个产品和默认图像通过，这样我就可以有一个产品图像和相关的产品属性。目前，我有两个单独的数组中的所有属性和所有图像

我已经看过了group_by，但我不知道如何将属性+图像按产品id从两个阵列组合在一起。我只是不知道如何进行

app/controller/home\u controller.html.erb

class HomeController < ApplicationController
  def index
    @products = Product.last(5)
    @product_ids = @products.map(&:id)
    @product_images = ProductImage.where(:product_id => @product_ids, 
    :default_image => true )
  end
end

 <% @products.each do |pd| %>
      <%= pd.product_name %>
  <% end %>
  <% @product_images.each do |pi| %>
      <%= image_tag (pi.product_image(:medium)) %>
  <% end %>

根据suslov的回答更新了index.htmml.erb部分

 Product Load (0.0ms)  SELECT  `products`.* FROM `products`   ORDER BY `products`.`id` DESC LIMIT 5
  SQL (1.0ms)  SELECT  DISTINCT `products`.`id` FROM `products` LEFT OUTER JOIN `product_images` ON `product_images`.`product_id` = `products`.`id` WHERE `product_images`.`product_id` IN (1, 2) AND `product_images`.`default_image` = 1  ORDER BY `products`.`id` DESC LIMIT 5
  SQL (0.0ms)  SELECT `products`.`id` AS t0_r0, `products`.`product_name` AS t0_r1, `products`.`product_description` AS t0_r2, `products`.`product_type_id` AS t0_r3, `products`.`product_category_id` AS t0_r4, `products`.`product_colour_id` AS t0_r5, `products`.`product_size_id` AS t0_r6, `products`.`created_at` AS t0_r7, `products`.`updated_at` AS t0_r8, `product_images`.`product_id` AS t1_r0, `product_images`.`created_at` AS t1_r1, `product_images`.`updated_at` AS t1_r2, `product_images`.`id` AS t1_r3, `product_images`.`product_image_file_name` AS t1_r4, `product_images`.`product_image_content_type` AS t1_r5, `product_images`.`product_image_file_size` AS t1_r6, `product_images`.`product_image_updated_at` AS t1_r7, `product_images`.`default_image` AS t1_r8 FROM `products` LEFT OUTER JOIN `product_images` ON `product_images`.`product_id` = `products`.`id` WHERE `product_images`.`product_id` IN (1, 2) AND `product_images`.`default_image` = 1 AND `products`.`id` IN (2, 1)  ORDER BY `products`.`id` DESC
  Rendered home/index.html.erb within layouts/application (0.0ms)

 <div class="row text-center">
      <% @product_images.each do |pd| %>
          <%= content_tag :div, :class => "col-md-3 col-sm-6 hero-feature" do %>
          <% pd.product_images.each do |i| %>
              <div class="thumbnail">
                <%= image_tag (i.product_image(:medium)) %>
          <% end %> </div>
          <div class="caption">
            <h3><%= pd.product_name %></h3>
            <p><%= pd.id %></p>
            <p></p>
          </div>
          <% end %>
      <% end %>
    </div>

“col-md-3 col-sm-6英雄功能”do%>

如果您在

产品

模型中明确设置了

具有多个

关联，则可以尝试使用

包含

（假设is命名为

产品图片

）：

app/controller/home_controller.rb：

app/views/home/index.html.erb：

非常接近。如果我删除了image_标记，但图像没有显示，则属性是确定的。用于#打印出阵列的未定义方法“product_image”它似乎不包含任何图像。@JasonMorelandDigitalrecline:print生成的sql查询。[#，#]@JasonMorelandDigitalrecline:images无论如何都不应该存在。在嵌套循环内打印

i

，查看是否有任何内容。

 <div class="row text-center">
      <% @product_images.each do |pd| %>
          <%= content_tag :div, :class => "col-md-3 col-sm-6 hero-feature" do %>
          <% pd.product_images.each do |i| %>
              <div class="thumbnail">
                <%= image_tag (i.product_image(:medium)) %>
          <% end %> </div>
          <div class="caption">
            <h3><%= pd.product_name %></h3>
            <p><%= pd.id %></p>
            <p></p>
          </div>
          <% end %>
      <% end %>
    </div>

@products = Product.includes(:product_images)
                   .where(product_images: { default_image: true )
                   .last(5)

<div class="col-md-3 col-sm-6 hero-feature">
  <div class="thumbnail">
    <% @products.each do |pd| %>
        <% pd.product_images.each do |i| %>
            <%= image_tag (i.product_image(:medium)) %>
        <% end %>
    <div class="caption">
      <h3><%= pd.product_name %></h3> 
      <p><%= pd.id %></p> 
      <p></p>
    </div>
    <% end %>
  </div>
</div>