On Mon, May 17, 2010 at 21:07, RobL <[email protected]> wrote:

>
> Eventually I realised the original empty string was not html_safe


I see how you got confused, but this is intentional. All strings are
originally not html_safe since there's no way of telling if they came from
the author or user input. I don't agree that Rails should special-case this
behavior (blank strings not html_safe) since I don't really think the way
you're building content here should be encouraged. Depending on your helper
as whole, there must be better ways.

Also, what about if you're appending user input instead of just content
tags:

  query = ""
  query << params[:query]
  query << content_tag(...)

If blank strings were safe to begin with, and users grew accustomed to the
fact, doing this would suddenly be exposing yourself to XSS via GET/POST
params.

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