What does <%== %> do in rails erb?
<%== is equivalent to raw.
From the Ruby on Rails Guide:
To insert something verbatim use the
rawhelper rather than callinghtml_safe:<%= raw @cms.current_template %> <%# inserts @cms.current_template as is %>or, equivalently, use
<%==:<%== @cms.current_template %> <%# inserts @cms.current_template as is %>
Rails actually uses Erubis instead of ERB, which supports a variety of other stuff.
<%== is exactly as you expect, though: It emits the value unescaped