Rails - Nov 2006 - Minimagick issue writing resized file

Hi there

I have a helper method in my Rails app that uses Minimagick as a plugin.

All is fine except for the write step where I attempt to write the
resized file to another directory.

I get the error: "undefined method `to_str'' for
#<Array:0x25221e8>"

Here''s my resizing method:

def display_thumb(product_id)
  # glob through images/books/thumbs dir to find thumb that matches isbn of book
  p = Product.find(product_id).isbn
  z = Dir["#{RAILS_ROOT}/public/images/books/#{p}.{gif,jpg,png}"]
  i = MiniMagick::Image.new(z)
  w = i[:width]
  h = i[:height]
  w = w.to_f
  h = h.to_f
  max_size = 60
  if (w > max_size || h > max_size)
    if (w > h)
      h = (h*(max_size/w)).to_i
      w = max_size
    else
      w = (w*(max_size/h)).to_i
      h = max_size
    end
    t = z.map {|image| "books/thumbs/" + File.basename(image)}
    i.resize "#{w}x#{h}"
    i.write(t)
  end
end


Any clues would be appreciated...as I said, all is fine until I
attempt to write the image to another directory. It''s resizing fine
until then.