Paperclip Autosizer

This code integrates with paperclip to save “WxH” image dimensions to the database.

Only runs after a post_processing event has succeeded and the sizes are written to the database during the normal rails model save method.

Columns are auto-detected allowing for optional autosizing of each attached_file or specific style of attachment.

Author

Andrew Eisberg

Copyright

Copyright © 2009 Andrew Eisberg

License

MIT License (www.opensource.org/licenses/mit-license.php)

Limitations

Currently only the ImageMagick ‘>’ geometry flag is supported. One could write additional methods to support other IM geometries.

Usage

class User < PaperclipAutosizer
  has_attached_file :avatar, :styles => { :thumb => "100x100>" },
                             :processors => [:autosize]
  has_attached_file :center, :styles => { :large => "500x500>" },
                             :processors => [:autosize]
  after_post_process :autosize_attached_files
end

In the migration for the model:

t.string   :avatar_thumb_size
t.string   :center_large_size

View code:

image_tag(@user.avatar.url(:thumb), :size => @user.avatar_thumb_size)
image_tag(@user.center.url(:large), :size => @user.center_large_size)

TextMate snippit

# Paperclip Method for ${1/[[:alpha:]]+|(_)/(?1::\u$0)/g} Attachment with Autosizing has_attached_file :${1:attachment_name}, :styles => { :${2:large} => “${3:750}x${4:750}>”, :${5:thumb} => “${6:150}x${7:150}>” }, :processors => [:autosize], :url => “/system/auto_load/${1}s/:id/:style/:basename.:extension”, :path => “:rails_root/public/system/auto_load/:attachment/:id/:style/:basename.:extension”, :default_url => “/system/auto_load/defaults/default_:style.png”

validates_attachment_size :${1}, :less_than => 1.megabytes validates_attachment_content_type :${1}, :content_type => [‘image/jpeg’, ‘image/png’] after_${1}_post_process :autosize_attached_files

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