Copy an image carrierwave - ruby-on-rails-3

Question

I have ArtworkUploader and i want to create a duplicate of the artwork image in same directory. Help me to solve this.
My Uploader:
class ArtworkUploader < CarrierWave::Uploader::Base
def store_dir
if model
"uploads/#{model.class.to_s.underscore}/#{model.id}/#{mounted_as}"
end
end
def filename
"artwork.png"
end
end
I tried with console but it doesn't work. What am i missing here?
Console:
> u = User.find(5)
> u.artwork.create(name: "testing.png", file: u.artwork.path)
> NoMethodError: undefined method `create!' for /uploads/5/artwork/Artwork:ArtworkUploader

Answer 1

there are 2 way I can think of you can do that
a) VIA Versioning :
create version of your file
version: copy_file do
process :create_a_copy
end
and now just define create_a_copy method inside your uploader which will just return the same file
This way you can have the copy of the file .I didn't understand your custom filename stuff but the way you have define it your for uploader filename method you can do that the same for version as well something like this
version: copy_file do
process :create_a_copy
def filename
"testing.png"
end
end
NOTE:
Not sure of the filename stuff for version file since I done it long back, but I believe the above setting of different filename method would work.
Adavantage :
All File and copy are associated in one uploader
No extra column is required on database (which is required in approach b)
Now the above approach too have some caveats in it
Slightly more complex
Single delete issue, delete to original uploader would delete its copy as well
b) VIA Separate Column :
They other way you can achieve that is defining a separate column called artwork_copy and mount the same uploader with just a slightly change in your uploader like this
def filename
if self.mounted_as == :artwork
"artwork.png"
else
"testing.png"
end
end
And the way you attach the file (give that your file is stored in locally)
u = User.find(5)
u.artwork_copy = File.open(u.artwork) ## Just cross check
u.save
There is an another way you do this via do the above same
u = User.find(5)
u.artwork_copy.store!(File.open(u.artwork))
Now you it pretty obvious what the advantage/disadvantage of the approach b mention above
Hope this make sense