Rails - Mar 2008 - Attachment_fu, Watermarks and after_save

Hi,
I''m having an issue with trying to watermark an uploaded image using
attachment_fu and Rails 2.0.2.

The model looks like...

class Picture < ActiveRecord::Base
  belongs_to :gallery
  after_save :watermark_image

  has_attachment :content_type => :image,
                  :storage  => :file_system,
                  :max_size => 2.megabytes,
                  :resize_to => ''500x500'',
                  :processor => "Rmagick",
                  :thumbnails => {
                    :large => ''128x128>'',
                    :small => ''64x64>''
                  }
  validates_as_attachment

  def watermark_image
    dst = Magick::Image.read("#{RAILS_ROOT}/
public#{self.public_filename}").first
    src = Magick::Image.read("#{RAILS_ROOT}/config/Logo.png").first
    result = dst.composite(src, Magick::SouthEastGravity,
Magick::OverCompositeOp)
    result.write("#{RAILS_ROOT}/public#{self.public_filename}")
  end
end

The code fails with a ''Cannot read image'' on the ''dst
= ...'' line of
the watermark_image method.

Looks like the file does not actually exist in the file system until
after ''after_save''?

removing the ''after_save'' and all works, except of course no
watermark..

Anyone have an ideas on how to achieve this?

thanks in advance...
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kevin evans wrote:
> Hi,
> 
> Anyone have an ideas on how to achieve this?
> 
> thanks in advance...

Besides public_filename there are other methods within the 
Attachment_fu'' modified model that you can get at.. I don''t
remember off
the top of my head what it''s name is but you can do the following to 
find out

script/console
> Picture.instance_methods.grep /path/
One of those methods should get you an absolute path in which your 
after_save filter should work..

I haven''t done this myself (other than using the alternate path
methods)
and it''s only the path I would take myself..

hth

ilan
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I have the exact same code as you do, and it works pefectly.

Actually, I also have ''unless self.thumbnail?'' at the
beginning of
that code block because I was getting my fullsize logo on top of my
thumbnails as well, but that''s a different story.

I would check your paths to make sure that things are where you expect
them.  ''after save'' is, well, after the record/file is saved,
so I
would look elsewhere for your problem.  When you''re looking at the
error page, are you 1000% sure that the path shown for the error page
exists and is valid?

On Mar 2, 6:26 pm, kevin  evans
<kwev...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi,
> I''m having an issue with trying to watermark an uploaded image
using
> attachment_fu and Rails 2.0.2.
>
> The model looks like...
>
> class Picture < ActiveRecord::Base
>   belongs_to :gallery
>   after_save :watermark_image
>
>   has_attachment :content_type => :image,
>                   :storage  => :file_system,
>                   :max_size => 2.megabytes,
>                   :resize_to => ''500x500'',
>                   :processor => "Rmagick",
>                   :thumbnails => {
>                     :large => ''128x128>'',
>                     :small => ''64x64>''
>                   }
>   validates_as_attachment
>
>   def watermark_image
>     dst = Magick::Image.read("#{RAILS_ROOT}/
> public#{self.public_filename}").first
>     src =
Magick::Image.read("#{RAILS_ROOT}/config/Logo.png").first
>     result = dst.composite(src, Magick::SouthEastGravity,
> Magick::OverCompositeOp)
>     result.write("#{RAILS_ROOT}/public#{self.public_filename}")
>   end
> end
>
> The code fails with a ''Cannot read image'' on the
''dst = ...'' line of
> the watermark_image method.
>
> Looks like the file does not actually exist in the file system until
> after ''after_save''?
>
> removing the ''after_save'' and all works, except of course
no
> watermark..
>
> Anyone have an ideas on how to achieve this?
>
> thanks in advance...
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