CODEWITHSUNDEEP
rubyvariableserb
ice
ice

Reputation: 65

Using variables in ruby erb variables

I have an erb file with a lot of these and I am trying to create a loop for them:

<% if @addhostgroup -%>
  <% @addhostgroup.each do |k, v| %>
    <%= k %> <%= v %>
  <% end %>
<% end %>

<% if @addservicegroup -%>
  <% @addservicegroup.each do |k, v| %>
    <%= k %> <%= v %>
  <% end %>
<% end %>

What I want to do is something like this:

<% %w(addhostgroup addservicegroup).each do |action| %>
  <% if @action -%>
    <% @action.each do |k, v| %>
      <%= k %> <%= v %>
    <% end %>
  <% end %>
<% end %>

Can somebody tell me how to use variables on erb variables names?

I was searching for a way without success.

Thank you very much!

Upvotes: 1

Views: 1806

Answers (2)

DonPaulie
DonPaulie

Reputation: 2214

The problem is that block variable action holds a string with the name of the action. You want to call @variable with dynamic name based on the name. You are searching for this piece of code: 

instance_variable_get("@#{action}")

Upvotes: 2

Tom
Tom

Reputation: 1320

Edit: An easier way would be to make a normal array instead of a percent literal. [@addhostgroup, @addservicegroup].each do |action|. Sometimes I over look the little things :)

You can use instance_variable_get along with the array and iteration into action that you have setup.

Add a line immediately inside the each block with: <% instance_var_value = instance_variable_get(:"@#{action}") %>

You could also map the values into the array before iterating over it.

Upvotes: 4

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