why <% concat(csrf_meta_tag) #aa%> is invalid while <% javascript_include_tag :defaults #abc%> is valid?

rubyonrails-talk
1

as the subject said.

2

What's invalid about it? I assume you get some sort of error message... can you post that to enlighten us, please?

Personally, though, I find I get problems with Ruby parsing if I comment in ERB tags after code, instead I tend to do this if I desperately want to comment in a view: <% code here %><%# comment here %>

3

I assume you mean <%= in the second case. The way that erb generates ruby code from a template means that comments aren't supported - the comment inside the <% tag ends up commenting other bits of the code generated by erb. The only form of comments that are safe is <%#

Fred