Ruby variable each loop substitution

Question

I need to replace X_VARIABLE in 2 places. For the first X_VARIABLE I want to keep the text 'remove' For the second X_VARIABLE I want to keep 'd_cars_path'

<% @cars.each do |x| %>
    <% @a = @b.send(x) %>
    <% if @a == true %>
      <%= button_to "removeX_VARIABLE", X_VARIABLEd_cars_path(:id => @user.id), class: "btn btn-large btn-primary" %>
    <% end %>
<% end %>

I am looking for some help with the variable substitution syntax. Thanks.

do you want the result like <%= button_to "remove", d_cars_path(:id => @user.id), class: "btn btn-large btn-primary" %> — AnkitG
– AnkitG, Commented Sep 8, 2012 at 10:37

tokland · Accepted Answer · 2012-09-08 11:54:58Z

1

I'd write:

<% @cars.each do |x| %>
  <% if @b.send(x) %>
    <%= button_to "remove#{x}", 
          send(:"#{x}d_cars_path", id: @user.id), 
          class: "btn btn-large btn-primary" %>
  <% end %>
<% end %>

answered Sep 8, 2012 at 11:54

tokland

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3 Comments

Michael Durrant Over a year ago

+1 I prefer this approach (and I gave a haml version of it too).

San Backups Over a year ago

Thank you. I didn't know the send(: ) function.

tokland Over a year ago

@Tony you used send in your code :-) maybe you didn't know that you can use it with implicit object (self).

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