CODEWITHSUNDEEP
ruby-on-railsruby
Simoroshka
Simoroshka

Reputation: 349

What is the meaning of <%%= in Ruby on Rails?

I cannot find it anywhere but in the project I am working with. It doesn't work in the same way as <%= (I tried to change), but I can't understand the difference. 

<span class="option-content" placeholder="<%=t('pages.edit.option')%>">
  <%%= content %>
</span>

Upvotes: 2

Views: 2695

Answers (2)

RJHunter
RJHunter

Reputation: 2867

In short, ERb processes double-percent marks into single-percent marks.

It looks like you're using one layer of ERb templates to generate another layer of ERb templates.

The first layer of ERb doesn't need a variable called content, just the t method: 

<span class="option-content" placeholder="<%=t('pages.edit.option')%>">
  <%%= content %>
</span>

That first layer is rendered to produce the second layer: 

<span class="option-content" placeholder="Edit">
  <%= content %>
</span>

As you can see, that is also an ERb template. I expect that something else, later on, takes that second ERb and uses it to render something like: 

<span class="option-content" placeholder="Edit">
  Hello, world.
</span>

Upvotes: 2

Deepak Mahakale
Deepak Mahakale

Reputation: 23661

The ERB dock here says

<% Ruby code -- inline with output %>
<%= Ruby expression -- replace with result %>
<%# comment -- ignored -- useful in testing %>
% a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)
%% replaced with % if first thing on a line and % processing is used
<%% or %%> -- replace with <% or %> respectively

this means the

<%%= content %>

will will be replaced with

<%= value of content %>

Upvotes: 5

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