Dynamic css classes inside embedded ruby

Question

A Persona has persona_id of either 1, 2 or 3. I want to assign a class type of either persona-1-button, persona-2-button or persona-3-button inside the embedded ruby. The following code is not working and I don't know why:

<% current_user.personas.each do |persona| %>
  <% foo = persona.persona_id.to_s %>
  <% bar = "persona-" + foo + "-button" %>
  <%= link_to "Persona", persona_path(persona), class: "btn btn-medium bar" %>
<% end %>

I didn't do it the follwoing way because it seems you can't have a <%=%> inside a <%=%>:

<% current_user.personas.each do |persona| %>
  <%= link_to "Persona", persona_path(persona), class: "btn btn-medium persona<%=persona.persona_id%>button" %>
<% end %>

possible duplicate of Dynamic CSS generation doesn't work in Rails4 — Surya
– Surya, Commented Oct 28, 2014 at 20:45
The problem has already been solved in Question. please refer stackoverflow.com/q/74660394/20669402 — ジャマル
– ジャマル, Commented Jan 17, 2023 at 19:56

Jakob S · Accepted Answer · 2014-10-28 20:28:30Z

4

You have it almost correct already.

The thing you need to realise is that when you're inside the <%/%> tags, you're in a Ruby context. That means, that the "..." creates a String inside which you can use regular Ruby string interpolation, like this:

  <%= link_to "Persona", persona_path(persona), class: "btn btn-medium #{bar}" %>

answered Oct 28, 2014 at 20:28

Jakob S

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Comments

D-side · Accepted Answer · 2014-10-28 20:27:44Z

3

You're placing a variable in Ruby context where you are bound by the rules of Ruby, not ERB. And in Ruby it's done using string interpolation:

<%= link_to "Persona", persona_path(persona), class: "btn btn-medium #{bar}" %>

answered Oct 28, 2014 at 20:27

D-side

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1 Comment

Bazley Over a year ago

Thank you chaps, appreciate it.

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