From: Steve V <ruby@...>
Date: 2005-04-21T06:04:59+09:00
Subject: Re: Store erb block and alter scope of erb block eval?


>
> Can you be more specific about what you are doing? I don't understand
> what you mean by "capture a block from an rhtml page".
>
> Could you provide your full code showing the problem you are having?
>
> (I'm not an ERb expert, so I'm probably missing some way of using it
> that I've not seen before.)

Hmm, okay. As you will see from using the below. The <%=@title%> value will
only be taken from the value in the TestController. No matter what I do, I
cannot get the @title variable set in the TableBuilder class to be the one
that is used.

Steve

test.rhtml:
<%tb = TableBuilder.new("Table Title")
tb.header_template do%>
	This is the header template <%=@title%>
<%end%>
<%=tb.render()%>

test_controller.rb:
class TestController < ApplicationController
	def test()
		#uncomment, and the title variable will
		#	be used in the template
		#@title = "controller title"
	end
end

class TableBuilder

	def initialize(title = "")
		@title = title
	end

	def header_template(&block)
		@headerTemplate = block

	end

	def render()
		out = ""

		#do table building stuff.
		_erbout = ""
		#the below is taken from capture_helper.rb in
		#	rails action_view\helpers
		buffer = eval("_erbout", @headerTemplate)
		pos = buffer.length
		@headerTemplate.call(binding)

		out << buffer[pos..-1]
		buffer[pos..-1] = ""

		#do other table building stuff

		return out
	end
end