I wrote a 5 line hack that you can drop into your initializers
directory to enable preprocessing in Erubis. This will run code in <
%=== %> brackets at compile time making views considerably faster for
rails helpers that only need to be evaluated once instead of on each
render (the Erubis docs mention 20-40% speed increase but obviously it
depends on the amount you precompile).
For example:
<%=== password_field_tag :password %>
will produce this *at compile time*:
<input id="password" name="password"
type="password" />
Of course, many helpers produce a different output depending on the
context which is not available at compile time so for those you would
need to stick with the usual <%= %>. For example link_to will work
only if it does not need the action name to generate the route.
It doesn''t work yet for "stylesheet_link_tag" and
"javascript_include_tag" which is a shame because those would be
excellent candidates to eval at compile time. Perhaps someone with a
deeper knowledge of Rails can say what would be needed to make that
work.
https://gist.github.com/707461
module ActionView
class Base
def get_binding;return binding;end
end
class Template
module Handlers
class Erubis < ::Erubis::Eruby
def add_expr_debug(src, code)
src << "@output_buffer.safe_concat(''"
<<
escape_text(eval(code,ActionView::Base.new.get_binding).to_s) <<
"'');"
end
end
end
end
end
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