Rails项目中show.html.erb页面意外输出数据库数组数据的解决求助

Hey there! Let's sort out that unexpected array data showing up at the bottom of your page—it's a super common gotcha for Rails/HTML beginners, so don't stress about it!

What's Causing the Issue? #

The root problem is how you're using ERB tags for your loops:

• You’ve got <%= @category.products.each do |product| %> for both of your loops.
• In ERB, <%= %> outputs the return value of the code inside it. Ruby's each method always returns the original collection (your full @category.products array) after finishing the loop, which is exactly what's ending up as that unwanted text at the bottom of your page.

The Simple Fix #

All you need to do is swap those <%= tags for <% tags for your each loops. This tells ERB to run the loop logic without printing its return value. The <%= %> tags for individual product attributes (like product.id or product.name) are still perfect—you want those values to show up on the page!

Here's your corrected code:

<table>
  <tr>
    <th>Name</th>
  </tr>
  <% @category.products.each do |product| %>
    <tr>
      <td><%= product.id %></td>
      <td><%= product.size %></td>
      <td><%= product.name %></td>
    </tr>
  <% end %>
</table>

<% @category.products.each do |product| %>
  <h3><%= product.id %></h3>
  <h3><%= product.size %></h3>
  <h3><%= product.name %></h3>
<% end %>

That should completely remove those redundant array entries from your page. Happy coding!

内容的提问来源于stack exchange，提问作者Kirix