Rails - Sep 2005 - bug in paginate

i am trying to paginate a custom join query but the following breaks:

    @node_pages, @nodes = paginate(:nodes, :join => ["left join models 
on nodes.model_id = models.id  left join manufacturers on 
models.manufacturer_id = manufacturers.id where manufacturers.id = ?", 
@mfg_id], :per_page => 1)

however the following works:

    @node_pages, @nodes = paginate(:nodes, :join => ["left join models 
on nodes.model_id = models.id  left join manufacturers on 
models.manufacturer_id = manufacturers.id where manufacturers.id = 
''#{@mfg_id}'' "], :per_page => 1)

any reason ?

I got the

Syntax error in query near "where manufacturers.id = ?3" ..

  not sure why it wont interpret that ? for variable substitution but 
its breaking.

thanks
adam