attachment_fu, how to regenerate thumbnails

[eugenio]

i'm using this plugin for files and images uploads.
it has a very useful feature that generate thumbnails of every
uploaded image, based on the geometry given in the model definition.
now i want to change the size of one of the thumbnail: how can i re-
generate them for the already saved image?

i found this http://github.com/kete/kete/blob/master/lib/tasks/tools.rake
but i don't understand how to use it.

[MaD]

why don't you just write a migration that loops all of those objects
with the old thumbnail-information and call the method that generates
the thumbnails again.

like this:

MyModel.find_all_with_thumbnails.each(&:generate_thumbnail)

i'd like to add: i don't know your app and i don't use attachment_fu
either. thus, the line above is obviously not working. it's just to
give you an idea.

[foz]

I use a method that rebuilds in my attachment model class:

# use attachment_fu protected methods to remake thumbs
def remake_thumbnails!
self.thumbnails.each {|thumb| thumb.destroy}
temp_file = create_temp_file
attachment_options[:thumbnails].each do |suffix, size|
self.create_or_update_thumbnail(temp_file, suffix, *size)
end
end

If you want a rake task, just loop through all your attachment records
and call it. I'm using something similar to this:

namespace :images do
desc "Rebuild all thumb images made by attachment_fu"
task :rebuild_thumbnails => :environment do
conditions = "(whatever you need)"
count = Image.count(:all, :conditions => conditions) # image is an
attachment_fu model
done = 0
chunk_size = 500
(0...(count/chunk_size)).each do |i|
Image.find(:all, :offset => i*chunk_size, :limit =>
chunk_size, :conditions => conditions).each do |image|
done = done + 1
# next if image.id < 46520 # to resume a stopped run
image.remake_thumbnails!
percent = "%.2f" % ((done/count.to_f)*100)
puts "#{i.id} #{percent}% done"
end
end
end

On Nov 26, 3:47 pm, eugenio <eugenio.mode...@gmail.com> wrote:
> i'm using this plugin for files and images uploads.

> it has a very useful feature that generatethumbnailsof every

> uploaded image, based on the geometry given in the model definition.
> now i want to change the size of one of the thumbnail: how can i re-
> generate them for the already saved image?
>

> i found thishttp://github.com/kete/kete/blob/master/lib/tasks/tools.rake

[xis...@gmail.com]

Hello!

This is old thread but i need some help!

I'd like to take foz's solution for my project using attachment_fu.

I am going to make link to remake thumbs in my view, and i don't need to rake task.

But I don't know where I should put  'remake_thumbnails!' method in.

I've tried to put the method in 'attachment_fu.rb', but it's not working.

Should I put it in my upload model or wherelse?  

And how can I call this method from view or controller?

I am a really beginner in web development using Rails and Ruby.

 it will many thanks if you help me.

2009년 11월 30일 월요일 오후 1시 15분 33초 UTC+9, foz 님의 말: