Rails - Mar 2006 - RMagick and thumbnails

I''ve based my code on the Agile example for uploading files, pages 
362-365. I''ve successfully loaded the Picture object to the database, 
but I come unstuck when trying to replicate this for a thumbnail version 
of the original image:

          thumbnail = Thumbnail.new
          thumbnail.name = ''thumbnail_'' + @picture.name.to_s
          thumbnail.content_type = @picture.content_type
          thumbnail.data = @picture.data
          thumbnail.make_thumbnail
          thumbnail.save

I get the following error on the make_thumbnail method:

ArgumentError (can''t decode image):
    /app/models/thumbnail.rb:11:in `read_inline''
    /app/models/thumbnail.rb:11:in `make_thumbnail''

Here''s the Thumbnail model:

  require ''RMagick''
  include Magick

  def make_thumbnail
    img = Image.read_inline(self.data)
    ...
  end

What do I have to do to thumbnail.data to get RMagick to read it?

Lindsay

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You should go the easy way by :
- using mini_magick instead rmagick (less memory foot print)
- storing your pictures on disk instead on db

In that case, handling file upload is quite simple.

Look here : http://www.ruby-forum.com/topic/59545#new

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Christophe Gimenez wrote:
> You should go the easy way by :
> - using mini_magick instead rmagick (less memory foot print)
> - storing your pictures on disk instead on db
> 
> In that case, handling file upload is quite simple.
> 
> Look here : http://www.ruby-forum.com/topic/59545#new
I would prefer to store the images in the database - but I''ll
definitely
look into mini_magick. Thanks.

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Lindsay Boyd wrote:
> What do I have to do to thumbnail.data to get RMagick to read it?
According to my reading of the RMagick docs, read_inline takes a 
Base64-encoded string. Is your @picture.data encoded, or raw?

--Al Evans

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