Question

我正在尝试从属于特定类别的产品列表中显示单个图像。例如我希望展示一种食品，一种家居用品，一种服装产品等...... 每个产品都有一个字段，其中填入一个下拉菜单，指示它属于哪个类别。我在控制器中实现了以下逻辑

if Product.where(:department.eql? "Stationery") then
  @stationery = [Product.where(:department.eql? "Stationery").first]
end
if Product.where(:department.eql? "Food") then
  @food = [Product.where(:department.eql? "Food").first]
end
if Product.where(:department.eql? "Toiletries") then
  @toiletries = [Product.where(:department.eql? "Toiletries").first]
end
if Product.where(:department.eql? "Household") then
  @household = [Product.where(:department.eql? "Household").first]
end
if Product.where(:department.eql? "Clothing") then
  @clothing = [Product.where(:department.eql? "Clothing").first]
end
if Product.where(:department.eql? "Accessories") then
  @accessories = [Product.where(:department.eql? "Accessories").first]
end

并且在视图中我有这个

<% @stationery.each do |stationery| %>
        <div class="column_entry">
            <% if Product.where(:department.eql? 'Stationery') %>
            <%= link_to image_tag(stationery.product_image.url(:normal_page_size)), products_content_url(stationery.id), :controller=>'products' %>
            <% end %>
        </div>
        <% end %>
        <% @food.each do |food| %>
        <div class="column_entry">
            <% if Product.where(:department.eql? 'Food') %>
            <%= link_to image_tag(food.product_image.url(:normal_page_size)), products_content_url(food.id), :controller=>'products' %>
            <% end %>
        </div>
        <% end %>
        <% @toiletries.each do |toiletries| %>
        <div class="column_entry">
            <% if Product.where(:department.eql? 'Toiletries') %>
            <%= link_to image_tag(toiletries.product_image.url(:normal_page_size)), products_content_url(toiletries.id), :controller=>'products' %>
            <% end %>
        </div>
        <% end %>
        <% @household.each do |household| %>
        <div class="column_entry">
            <% if Product.where(:department.eql? 'Household') %>
            <%= link_to image_tag(household.product_image.url(:normal_page_size)), products_content_url(household.id), :controller=>'products' %>
            <% end %>
        </div>
        <% end %>
        <% @clothing.each do |clothing| %>
        <div class="column_entry">
            <% if Product.where(:department.eql? 'Clothing') %>
            <%= link_to image_tag(clothing.product_image.url(:normal_page_size)), products_content_url(clothing.id), :controller=>'products' %>
            <% end %>
        </div>
        <% end %>
        <% @accessories.each do |accessories| %>
        <div class="column_entry">
            <% if Product.where(:department.eql? 'Accessories') %>
            <%= link_to image_tag(accessories.product_image.url(:normal_page_size)), products_content_url(accessories.id), :controller=>'products' %>
            <% end %>
        </div>
        <% end %>

我遇到的问题是有6种产品进入，但它们都是相同的产品，我的逻辑一定存在问题我无法看到。

我知道我通过控制器和视图在这里加倍了一段时间，但是我已经把这段代码搞砸了一段时间并尝试了很多变化。

我的猜测就是这一行

 if Product.where(:department.eql? 'Household')

和类似的行，但我无法弄清楚如何使这个工作。非常感谢任何帮助

Answer 1

你做的太多“如果”，你真的需要那么多吗？这使你的代码难以调试。

尝试类似

的内容

@products = {}
["Stationery","Food","Toiletries","Household","Clothing","Accessories"].each do |dep|
  @products[dep] = Product.where(department: dep).first
end

并将所有观点替换为：

<%- ["Stationery","Food","Toiletries","Household","Clothing","Accessories"].each do |dep| -%>
  <div class="column_entry">
    <%- if product = @products[dep] -%>
      <%= link_to image_tag(product.product_image.url(:normal_page_size)), products_content_url(product), :controller=>'products' -%>
    <%- end -%>
  </div>
<%- end -%>

编辑：稍微更改了代码，你甚至可以让那个deparments数组保持恒定

'if'语句逻辑带有'where'条件

1 个答案: