Rails - Aug 2007 - Render partial from Backgroundrb worker?

Hi,

I have a long running task which generates JavaScript to files and I am
hoping to move this to a backgroundrb worker. The javascript is
currently generated with call to render_to_string:

File.open(File.join(target_folder, ''all.js''), "w")
do |file|
  file.puts(render_to_string :partial =>
''partials/shared/javascript/tags'', :locals => { :namespaces
=>
@namespaces, :tags => @tags, :parent_tags => @parent_tags, :show_counts
=> true })
end

It seems that the render_to_string is not available to the worker. Does
anyone know of a better way to achieve this using a partial? I can fall
back to generating the javascript text in a method, but this seems quite
an ugly solution (although will be much more performant than my current
in process solution).

Any tips or pointers would be much appreciated.

Thanks,
GiantCranes
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It is possible to render an action from backgroundrb, although it''s a
bit tedious. Backgroundrb doesn''t seem to load the controller layer
when it runs - I assume this is because it''s intended for manipulating
data, and not generating views, which makes sense. Anyway, in order to
get the rendering functions working you need to create a Dummy
controller that implements a few methods that render relies on. I''ve
included a stripped down version below which *should* work, although I
haven''t tested it. The example works on the older win32 compatible
version of backgroundrb, but I haven''t tried it on the newer *nix only
version.

===================================================
class SampleWorker < BackgrounDRb::Rails
  require ''action_view''

  def do_work(args)
    #redirect the rails default logger for active record to
backgroundrb
    ActiveRecord::Base.logger= @logger

    action_view ActionView::Base.new(Rails::Configuration.new.view_path, {},
DummyController.new)
    action_view.render(:partial => "foo/bar")
  end
end

class DummyController

  def logger
    @logger
  end

  def headers
    {''Content-Type'' => ''application/xml''}
  end

  def response
    DummyResponse.new
  end

  def content_type
    ''application/xml''
  end

end

class DummyResponse
  def content_type
    ''application/xml''
  end
end

===================================================Hope that helps,

Dan


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Dan,

Thanks! That worked well. The only slight modification was the addition 
of the following lines:

require ''active_support''
require ''action_controller''
require ''action_view''

Thanks again,
GiantCranes
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