How can I resize a Paperclip image after it has been added to the database?

Question

I've added 2000 pictures to my images table and I'm using the Paperclip plugin to create thumbs. I'm wondering if there's a way to go through the database and add another :styles element.

For example, when I added the images I had the following in my model:

has_attached_file :image, :styles => { :medium => "300x300>", :thumb => "100x100>" }

However, now I want to add a :large attribute and have it applied to every image that's already in my table. Something like:

has_attached_file :image, :styles => { :large => "800x800>", :medium => "300x300>", :thumb => "100x100>" }

Is this possible? Or would I have to re-add all 2000 pictures?

score 42 · Accepted Answer · edited Sep 20 '11 at 02:25

42

If Paperclip is installed as a plugin, you can do this:

rake paperclip:refresh:thumbnails CLASS=Screenshot

where Screenshot is the name of the class with the attachment.

If it's installed as a gem, do this inside script/console:

Screenshot.all.each {|s| s.image.reprocess! }

replacing Screenshot with the appropriate class name

edited Sep 20 '11 at 02:25

thenengah

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answered Mar 18 '10 at 10:52

Jonathon Horsman

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The second method is really helpful, I failed the first one with undefined method exception. – albb Mar 29 '11 at 18:34
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if you have a ton of screenshots you should use #find_each. Screenshot.find_each {|s| s.image.reprocess! } – Schneems Dec 14 '11 at 00:37
The second method worked great on the `rails console` with Paperclip as a plugin. Thanks! – Andrew Anderson Apr 19 '12 at 13:06

score 6 · Answer 2 · answered Oct 15 '09 at 15:51

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rake paperclip:refresh:thumbnails

answered Oct 15 '09 at 15:51

mculp

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To me more specific: rake paperclip:refresh:thumbnails CLASS=MyClass – pixelearth Mar 17 '11 at 21:06

How can I resize a Paperclip image after it has been added to the database?

2 Answers2