Attachment_fu: loading objects w/ attachments in batch?

Rails
1

Using the (very nifty) attachment_fu plugin. It would be very
convenient if I could batch-load a lot of my model objects that have
attachments, instead of having to load them interactively via a web
page.

Experimented with calling uploaded_data= directly, but didn’t work,
and I’m not sure that’s the right route. Any suggestions?

Thanks,

dwh

2

Not sure if this is what you’re after or not. We have some scenarios
in which we create files (reports) on the webserver in response to a
user request and then save them on the server using an attachment_fu-
based model. It’s similar in that we’re creating the model with a
file but avoiding the interactive part.

It was as simple as setting .temp_path. Note that this works
for us because we’re storing objects in the file system rather than
the DB/S3. temp_path is mixed in for file system storage; not sure
about the others.

3

Hmm, that might work. Will investigate.

Thanks,

dwh

4

Aha. http://blog.lachaise.org/?p=8 seems to provide a way to do this
(in the middle of a discourse about duck typing…)

dwh

5

Actually, having followed a suggestion in the comments to that blog
entry, there’s even an easier way (below, ImageMetadata is my class
that has_attachment):

script/console

Mime::Type.register “image/gif”, :gif
=> [“gif”]

t = ActionController::TestUploadedFile.new(‘db/seed-data//tile-samples/bippy2.gif’, Mime::GIF)
=> #<ActionController::TestUploadedFile:0xb70358d8
@original_filename=“bippy2.gif”, @content_type=#<Mime::Type:0xb7039974
@synonyms=[], @symbol=:gif, @string=“image/gif”>, @tempfile=#<File:/
tmp/bippy214728-4.gif>>

m = ImageMetadata.new
=> #<ImageMetadata id: nil, size: nil, content_type: nil, filename:
nil, height: nil, width: nil, parent_id: nil, thumbnail: nil,
property_value_id: nil, created_at: nil, updated_at: nil>

m.uploaded_data = t
=> #<ActionController::TestUploadedFile:0xb70358d8
@original_filename=“bippy2.gif”, @content_type=#<Mime::Type:0xb7039974
@synonyms=[], @symbol=:gif, @string=“image/gif”>, @tempfile=#<File:/
tmp/bippy214728-4.gif>>

m.save!
=> true

Seems like sorta a pain that you have to explicitly set the mime type,
but hey, small price to pay…

dwh