Rails - Mar 2007 - Faking it... import local files into attachment_fu

Hello,

I''m working on an import utility that will match the functionality of
uploading an object of a model that uses attachment_fu for
thumbnailing, etc.

Rather than uploading the file via a form, I want to populate the
params[:image][:uploaded_data] with data from a file already on the
server''s file system.

So far, I''ve been able to copy to an instance of Tempfile via the
copy_to_temp_file method I jacked from attachment_fu  and pass that as
the value of :uploaded_data, but attachment_fu is still not happy.
The Tempfile created via a multipart form and a browser has
content_type set, as well as having the path be how the object is
identified (i.e. - #<File:/tmp/file/path>).

I feel like I''ve either reached a dead end and I have to explore
setting size, original_filename, and content_type explicitly in the
new method parameters or that I''m just bumping up against my ignorance
and there is a better way I don''t know about.

Recommendations?

I noticed that there are mechanisms for this fake out in testing code,
perhaps I''ll give them another look.

Cheers,
Walter McGinnis
http://blog.katipo.co.nz/


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Add this to your has_attachment class
Let me know how it works

 def local_file=(local_file_path, content_type = nil)
    @@image_mime_types ||= {
                                         ".gif" =>
"image/gif",
                                         ".ief" =>
"image/ief",
                                         ".jpe" =>
"image/jpeg",
                                         ".jpeg" =>
"image/jpeg",
                                         ".jpg" =>
"image/jpeg",
                                         ".pbm" =>
"image/x-portable-
bitmap",
                                         ".pgm" =>
"image/x-portable-
graymap",
                                         ".png" =>
"image/png",
                                         ".pnm" =>
"image/x-portable-
anymap",
                                         ".ppm" =>
"image/x-portable-
pixmap",
                                         ".ras" =>
"image/cmu-raster",
                                         ".rgb" =>
"image/x-rgb",
                                         ".tif" =>
"image/tiff",
                                         ".tiff" =>
"image/tiff",
                                         ".xbm" =>
"image/x-xbitmap",
                                         ".xpm" =>
"image/x-xpixmap",
                                         ".xwd" => "image/x-
xwindowdump",
                                       }.freeze
    content_type ||= @@image_mime_types[File.extname(local_file_path)]
    raise "Unrecognized MIME type for #{local_file_path}" unless
content_type
    self.uploaded_data = LocalUploadedFile.new(local_file_path,
content_type)
  end

 # Taken from action_controller/test_process.rb
  # Essentially generates a modified Tempfile object similar to the
object
  # you''d get from the standard library CGI module in a multipart
  # request. This means you can use an
ActionController::TestUploadedFile
  # object in the params of a test request in order to simulate
  # a file upload.
  require ''tempfile''
  class LocalUploadedFile
    # The filename, *not* including the path, of the "uploaded" file
    attr_reader :original_filename

    # The content type of the "uploaded" file
    attr_reader :content_type

    def initialize(path, content_type = ''text/plain'')
      raise "#{path} file does not exist" unless File.exist?(path)
      @content_type = content_type
      @original_filename = path.sub(/^.*#{File::SEPARATOR}
([^#{File::SEPARATOR}]+)$/) { $1 }
      @tempfile = Tempfile.new(@original_filename)
      FileUtils.copy_file(path, @tempfile.path)
    end

    def path #:nodoc:
      @tempfile.path
    end

    alias local_path path

    def method_missing(method_name, *args, &block) #:nodoc:
      @tempfile.send(method_name, *args, &block)
    end
  end

On Mar 11, 5:36 pm, "mcginniwa"
<walter.mcgin...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hello,
>
> I''m working on an import utility that will match the functionality
of
> uploading an object of a model that uses attachment_fu for
> thumbnailing, etc.
>
> Rather than uploading the file via a form, I want to populate the
> params[:image][:uploaded_data] with data from a file already on the
> server''s file system.
>
> So far, I''ve been able to copy to an instance of Tempfile via the
> copy_to_temp_file method I jacked from attachment_fu  and pass that as
> the value of :uploaded_data, but attachment_fu is still not happy.
> The Tempfile created via a multipart form and a browser has
> content_type set, as well as having the path be how the object is
> identified (i.e. - #<File:/tmp/file/path>).
>
> I feel like I''ve either reached a dead end and I have to explore
> setting size, original_filename, and content_type explicitly in the
> new method parameters or that I''m just bumping up against my
ignorance
> and there is a better way I don''t know about.
>
> Recommendations?
>
> I noticed that there are mechanisms for this fake out in testing code,
> perhaps I''ll give them another look.
>
> Cheers,
> Walter McGinnishttp://blog.katipo.co.nz/

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I have a similar problem, but now I''m using file_column.

mcginniwa: did it worked properly?

Or maybe someone knows how to make it works with file_column plugin?


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I don''t know if it''s the right way to do this, but it works:

Asset.create :temp_path => File.new("/home/bruno/wallpaper.png"),
:filename => ''wallpaper.png'', :content_type =>
''image/png''

On 4/19/07, Drogomir <drogus-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> I have a similar problem, but now I''m using file_column.
>
> mcginniwa: did it worked properly?
>
> Or maybe someone knows how to make it works with file_column plugin?
>
>
> >
>
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Yep.  That was what basically worked for me.  Check out 613 through
618 in this file for actual code:

http://development.kete.net.nz/kete/repository/file/trunk/lib/workers/past_perfect4_importer_worker.rb

Cheers,
Walter


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