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erb how to loop on array

nemenems Published in 2018-02-14 10:04:47Z

I can't simply loop on an array with ruby erb template system...

here is my template:

<% ['foo', 'bar'].each do |val| -%>
<%= val %>
<% end -%>

Here is the command line and the result

erb test.erb
/usr/share/rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/erb.rb:896:in `eval': test.erb:1: syntax error, unexpected ';' (SyntaxError)
'foo', 'bar'].each do |val| -; _erbout.concat "\n"
test.erb:3: syntax error, unexpected ';'
;  end -; _erbout.concat "\n"
        from /usr/share/rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/erb.rb:896:in `result'
        from /usr/share/rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/erb.rb:878:in `run'
        from /usr/share/rvm/rubies/ruby-2.4.1/bin/erb:149:in `run'
        from /usr/share/rvm/rubies/ruby-2.4.1/bin/erb:170:in `<main>'

What is wrong with this really simple example?

Disclaimer: I am a ruby and erb noob ^^

Oli Crt
Oli Crt Reply to 2018-02-14 10:11:23Z

You're not supposed to have those "-" at the end beofre the "%".

<% ['foo', 'bar'].each do |val| %>
    <%= val %>
<% end %>

This should work.

Stefan Reply to 2018-02-14 10:34:34Z

You have to set trim mode to -:

$ erb -T - test.erb

From the man page:

-T mode   Specifies trim mode (default 0). mode can be one of
          0   EOL remains after the embedded ruby script is evaluated.
          1   EOL is removed if the line ends with %>.
          2   EOL is removed if the line starts with <% and ends with %>.
          -   EOL is removed if the line ends with -%>. And leading whitespaces
              are removed if the erb directive starts with <%-.
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