[LRUG] Concat and Strings

[James McCarthy]

I just cut and pasted your example and got the latter in 2.0.2

James McCarthy
http://thewerks.org.uk



On 13 May 2008, at 09:23, Andrew Stewart wrote:

> Hi El Rug,
>
> I can't quite explain the behaviour I'm seeing below.  I'd value any  
> explanation.
>
> So...I have a wrap method in a Rails view helper (fragmented for  
> debugging):
>
>  def wrap(with, &block)
>    inner = capture &block
>    s = "#{with} { #{inner} }"
>    concat s, block.binding
>  end
>
> In the same helper, I have another method which calls the first like  
> this:
>
>  def ie6(&block)
>    wrap '* html', &block
>  end
>
> In my view, a stylesheet template, I do this:
>
>  <% ie6 do %>
>    body {
>      padding: 4px;
>    }
>  <% end %>
>
> The rendered template shows what I want, which is:
>
>  * html body {
>    padding: 4px;
>  }
>
> But I can't explain why it doesn't show this instead:
>
>  * html {
>    body {
>      padding: 4px;
>    }
>  }
>
> After all, that is what I get if I insert a "puts s" line in my wrap  
> method.
>
> So something about concat is interpreting the { and } in s...but what?
>
> If I remove the { and }, I get this:
>
>  * html
>  body {
>    padding: 4px;
>  }
>
> which makes sense, but isn't what I want.  I want the html and body  
> on the same line.
>
> The concat method looks like this:
>
>  # http://github.com/rails/rails/tree/master/actionpack/lib/action_view/helpers/text_helper.rb#L28
>  def concat(string, binding)
>    eval(ActionView::Base.erb_variable, binding) << string
>  end
>
> As far as I can tell, the string is passed through untouched.
>
> Any ideas?
>
> Regards,
> Andy Stewart
>
> -------
> AirBlade Software
> http://airbladesoftware.com
>
>
>
>
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