Paperclip Montage

Paperclip Montages aim is to make it easier to create Paperclip avatars for meta models. It is a wrapper for ImageMagick's montage tool.

This was build for Oplerno's online education platform for combining course avatars so they can be displayed as certificate avatars.

Installation

gem 'paperclip_montage'

gem install paperclip_montage

Example

This is a simple example in which Meta creates a combined avatar.

class Avatar < ActiveRecord::Base
	has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "100x100>" }

	has_and_belongs_to_many :metas

	validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
end

class Meta < ActiveRecord::Base
	#after_update :reprocess_montage

	has_and_belongs_to_many :avatars

	has_attached_file :montage,
		processors: [:montage],
		:styles => { medium: { geometry: "300x300>", source: :avatars} , thumb: { geometry: "100x100>" } }

	validates_attachment :montage, :attachment_presence => true,
		:content_type => { :content_type => "image/jpeg" }

	def reprocess_montage
		montage.reprocess!
	end
end

After any changes to the icon for an Avatar the method reprocess_montage must be called on the Meta object.

Acknowledgements

Test image by Matthias Georg - https://www.flickr.com/photos/114805503@N05/15811868778/

Help from these sources:

• https://github.com/janfoeh/paperclip-optimizer
• https://github.com/thoughtbot/paperclip
• https://gist.github.com/laurynas/708077
• http://matthewhutchinson.net/2010/10/25/editing-file-uploads-with-a-paperclip-processor