Counting in View Rails

Question

I've got a list of items I'm looping in an each in my show view. This is all perfectly fine. However, I would like to get a number infront of each item which increments with every loop ( i = 0, i++ you know the drill ).

Now, how can i do this in Rails? This is what I get by now:

<% i = 0 %>
<% @trip.triplocations.each do |tl| %>
  <article id="<%= dom_id(tl)  %>">
    <strong> <%= tl.title %> </strong>
      <p>
        <%= tl.description %>
      </p>
  </article>
<% end %>

waldyr.ar · Accepted Answer · 2012-10-13T10:14:31.257

13

Use #each_with_index instead of instantiating a variable in view!

<% @trip.triplocations.each_with_index do |tl, i| %>
  <article id="<%= dom_id(tl) %>">
    <strong> <%= i %>. <%= tl.title %> </strong>
      <p>
        <%= tl.description %>
      </p>
  </article>
<% end %>

edited Oct 13 '12 at 10:14

answered Oct 13 '12 at 06:07

waldyr.ar

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64

That certainly worked! However; is it possible to start the i at 1? Since i want to use it as a visual numbering. – CaptainCarl Oct 13 '12 at 06:16
3

You can increase by 1 like this `<%= i+1 %>`. This should work but for more information take a look at [HERE](http://stackoverflow.com/questions/5646390/ruby-each-with-index-offset). – waldyr.ar Oct 13 '12 at 06:17

RAM · Answer 2 · 2012-10-13T06:14:39.803

0

Probably you want this sort of code.

<% i = 0 %>
<% @trip.triplocations.each do |tl| %>
    <article id="<%= dom_id(tl)  %>">
        <strong> <%= tl.title %> </strong>
        <p>
            <%= i %>
            <%= tl.description %>

        </p>
    </article>
    <% i = i + 1 %> 
<% end %>

Note:

You can place the code

<%= i %>

anywhere you want inside the loop.

edited Oct 13 '12 at 06:14

answered Oct 13 '12 at 06:07

RAM

2,413
1
21
33

score 0 · Answer 3 · answered Oct 13 '12 at 06:15

There is no ++ operator in Ruby. Instead you use += 1:

array = 'a'..'d'

i = 0
array.each do |element|
  puts "#{i} #{element}"
  i += 1
end

Prints

0 a
1 b
2 c
3 d

However, you should not do that because there is already a convenient method for that:

array = 'a'..'d'

array.each_with_index do |element, i|
  puts "#{i} #{element}"
end

There is another way of doing that specific to Rails. If you render collection using a partial you will have object_counter variable available where "object" is your model name. For example:

<%= render @trip.triplocations %>

<% # in views/triplocations/_triplocation.html.erb %>
<%= triplocation_counter %>
<%= triplocation.title %>

Counting in View Rails

3 Answers3