using variables in rails erb

Question

I'm coming from a .net c# razor background, so I'm wondering how I might do the following in rails .erb view.

Razor:

@{var i = 0}
<table>
     <tr><th>name</th></tr>
     @foreach item in collection{
        <tr>
             <td>@[email protected]</td>
        </tr>
     }
</table>

I want a way to use an iteration variable in the view. Does a rails erb file have the ability to do this? where I can create the variable in the view and interact with it?

thanks in advance.

Even though this has a negative effort number, this question/answer really has helped me. I hope it helps others in the future :) — conterio
– conterio, Commented Apr 24, 2017 at 20:15

Dave Newton · Accepted Answer · 2017-04-20 17:28:46Z

6

The docs pretty much answer this: https://apidock.com/ruby/ERB

Although I wouldn't do it like that, rather:

<table>
  <tr><th>name</th></tr>

  <% collection.each_with_index do |item, i| %>
    <tr>
      <td>
        <%= i %>. <%= item %>
      </td>
    </tr>
  <% end %>
</table>

To answer your specific but non-canonical-Ruby question, sure:

<% i = 0 %>
<table>
  <% collection.each do |item| %>
    <!-- Etc -->
    <%= i += 1 %>

(Not clear to me if you want zero- or one-based indexing; adjust all examples as required.)

edited Apr 20, 2017 at 17:28

answered Apr 20, 2017 at 17:23

Dave Newton

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1 Comment

conterio Over a year ago

Thank you for your answer. The .item was a typo, the item is the object i want to print out. and the period (.) is just for the number showing what row is on, kind of like an ordered list <ol>

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