Dragonfly can be used with any ActiveModel-compatible model, and so you can use it with CouchDB using CouchRest::Model.

Since CouchDB allows you to store files directly on documents as attachments, you can also use the supplied CouchDataStore. which allows storing files as attachments directly on documents.

For more info about ActiveModel, see Models.

For more info about using the Couch data store, see DataStorage.

Example setup in Rails, using CouchRest::Model

In config/initializers/dragonfly.rb:

require 'dragonfly'

app = Dragonfly[:images]

# Get database config from config/couchdb.yml
couch_settings = YAML.load_file(Rails.root.join('config/couchdb.yml'))[Rails.env]

# Configure to use ImageMagick, Rails defaults, and the Couch data store
app.configure_with(:rails) do |c|
  c.datastore =
    :host => couch_settings['host'],
    :port => couch_settings['port'],
    :username => couch_settings['username'],
    :password => couch_settings['password'],
    :database => couch_settings['database']

# Allow all CouchRest::Model models to use the macro 'image_accessor'
app.define_macro(CouchRest::Model::Base, :image_accessor)

# ... any other setup, see Rails docs

Then in models:

class Album < CouchRest::Model::Base
  property :cover_image_uid
  image_accessor :cover_image

  # ...

See Models for more info.