Ruby interpolating into variable

Question

This is a hard question for me to even ask so I'll share the code first:

        <div class="col-xs-12">
          We operate on a pay what you want model. Keep in mind that 
          <% if action_name == "outdoors" %>
            <%= outdoors_donation.html_safe %>
          <% elsif action_name == "snowsports" %>
            <%= snowsports_donation.html_safe %>
          <% end %>
          Below, you'll find information on how we calculated your order's suggested donation of $<span id="modal-sentence"></span>.
        </div>

Rather than the clunky if statement, I'd rather just be able to inject action_name directly into the variable that's being called.... something like

<%= "#{action_name}_donation".html_safe %>

But not sure what this would actually be

Thanks!

Are your variables (outdoors_donation and snowsports_donation) instance variables? — QMFNP
– QMFNP, Commented Apr 20, 2015 at 22:52
You could keep the values in a hash and use the variable as the key, e.g. donations[action_name]. — Jon Egeland
– Jon Egeland, Commented Apr 20, 2015 at 22:52
YES a hash duh... ugh narrow minded ness will be the death of me, THANKS! — james
– james, Commented Apr 20, 2015 at 23:02

Shadwell · Accepted Answer · 2015-04-20 22:58:49Z

2

You can use send in ruby to send a method that you provide the name for. This allows you to do interpolation:

<%= self.send("#{action_name}_donation").html_safe %>

In this context self would be the view instance which is the same as calling outdoors_donation.html_safe or snowsports_donation.html_safe or whatever.

answered Apr 20, 2015 at 22:58

Shadwell

34.9k14 gold badges98 silver badges99 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

james Over a year ago

Thanks! I'm going to go with the hash though because it feels much cleaner to me, but this is great as well!

Shadwell Over a year ago

Yeah, my answer addresses the question but I think the hash approach is probably a better to solution to the actual problem.

Collectives™ on Stack Overflow

Ruby interpolating into variable

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related