Mongoid::Paperclip enables you to use Paperclip with the Mongoid ODM for MongoDB.
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Mongoid::Paperclip - Making Paperclip play nice with Mongoid ODM

As the title suggests: Mongoid::Paperclip makes it easy to hook up Paperclip with Mongoid.

This is actually easier and faster to set up than when using Paperclip and the ActiveRecord ORM. This example assumes you are using Ruby on Rails 3 and Bundler. However it doesn't require either.

Setting it up

Simply define the mongoid-paperclip gem inside your Gemfile. Additionally, you can define the aws-s3 gem if you want to upload your files to Amazon S3. You do not need to explicitly define the paperclip gem itself, since this is handled by mongoid-paperclip.

Rails.root/Gemfile - Just define the following:

gem "mongoid-paperclip", :require => "mongoid_paperclip"
gem "aws-s3",            :require => "aws/s3"

Next let's assume we have a User model and we want to allow our users to upload an avatar.

Rails.root/app/models/user.rb - include the Mongoid::Paperclip module and invoke the provided class method

class User
  include Mongoid::Document
  include Mongoid::Paperclip

  has_mongoid_attached_file :avatar

That's it

That's all you have to do. Users can now upload avatars. Unlike ActiveRecord, Mongoid doesn't use migrations, so we don't need to define the Paperclip columns in a separate file. Invoking the has_mongoid_attached_file method will automatically define the necessary :avatar fields for you in the background.

A more complex example

Just like Paperclip, Mongoid::Paperclip takes a second argument (hash of options) for the has_mongoid_attached_file method, so you can do more complex things such as in the following example.

class User
  include Mongoid::Document
  embeds_many :pictures

class Picture
  include Mongoid::Document
  include Mongoid::Paperclip

  embedded_in :user, :inverse_of => :pictures

  has_mongoid_attached_file :attachment,
    :path           => ':attachment/:id/:style.:extension',
    :storage        => :s3,
    :url            => ':s3_alias_url',
    :s3_host_alias  => '',
    :s3_credentials => File.join(Rails.root, 'config', 's3.yml'),
    :styles => {
      :original => ['1920x1680>', :jpg],
      :small    => ['100x100#',   :jpg],
      :medium   => ['250x250',    :jpg],
      :large    => ['500x500>',   :jpg]
    :convert_options => { :all => '-background white -flatten +matte' }
end do |picture|
  <%= picture.attachment.url %>

There you go

Quite a lot of people have been looking for a solution to use Paperclip with Mongoid so I hope this helps!

If you need more information on either Mongoid or Paperclip I suggest checking our their official documentation and website.