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# How to use Paperclip for generic attachment types on models in Ruby on Rails

class User < ActiveRecord::Base
  has_many :user_assets
end

# example of building a model which is a generic attachment asset
@user.build_user_asset(:asset_type => "podcast", :attached_file => some_uploaded_file_data)

# make a generic asset class, with instances initialized for specific asset

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development: &global_settings
  database: textual_development
  host: 127.0.0.1
  port: 27017

test:
  database: textual_test
  <<: *global_settings

production:

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class Chapter < ActiveRecord::Base
  validates :subdomain,
    :presence => true,
    :uniqueness => true,
    :length => { :maximum => 63 }
  validates_format_of :subdomain, :with => /^[a-z0-9-]+$/i, :message => 'can only contain letters, numbers, and dashes'
  validates_format_of :subdomain, :without => /^-/,         :message => 'can not start with a dash'
  validates_format_of :subdomain, :without => /-$/,         :message => 'can not end with a dash'
  validates_format_of :subdomain, :without => /--/,         :message => 'can not contain two consecutive dashes'
end

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# mongo_template.rb

# remove unneeded defaults
run "rm public/index.html"
run "rm public/images/rails.png"
run "rm public/javascripts/controls.js"
run "rm public/javascripts/dragdrop.js"
run "rm public/javascripts/effects.js"
run "rm public/javascripts/prototype.js"

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# mongo_template.rb
# fork of Ben Scofield's Rails MongoMapper Template (http://gist.github.com/181842)
#
# To use:
#  rails project_name -m http://gist.github.com/270200.txt

# remove unneeded defaults
run "rm public/index.html"
run "rm public/images/rails.png"

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# mongo_template.rb
# fork of Ben Scofield's Rails MongoMapper Template (http://gist.github.com/181842)
#
# To use:
#  rails project_name -m http://gist.github.com/gists/219223.txt

# remove unneeded defaults
run "rm public/index.html"
run "rm public/images/rails.png"
run "rm public/javascripts/controls.js"

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#----------------------------------------------------------------------------
# Git Setup
#----------------------------------------------------------------------------
file '.gitignore', <<-FILE
.DS_Store
log/*.log
tmp/**/*
config/database.yml
db/*.sqlite3
public/uploads/*

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class AddAttachmentsDataToWrapper < ActiveRecord::Migration
  def self.up
    add_column :wrappers, :data_file_name, :string
    add_column :wrappers, :data_content_type, :string
    add_column :wrappers, :data_file_size, :integer
    add_column :wrappers, :data_updated_at, :datetime
  end

  def self.down
    remove_column :wrappers, :data_file_name

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I created an Attachment class. This is a paperclip bug. Fix is to rename your Attachment class.

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# A polymorphic has_many :through relationship in Rails 2.3
# based on Josh Susser's "The other side of polymorphic :through associations"
# http://blog.hasmanythrough.com/2006/4/3/polymorphic-through
class Authorship < ActiveRecord::Base
  belongs_to :author
  belongs_to :publication, :polymorphic => true
end

class Author < ActiveRecord::Base
  has_many :authorships