Mongoid support for CarrierWave
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CarrierWave for Mongoid

This gem adds support for Mongoid and MongoDB's GridFS to CarrierWave

This functionality used to be part of CarrierWave but has since been extracted into this gem.


gem install carrierwave-mongoid

Requiring the gem

require 'carrierwave/mongoid'

Using Bundler

gem 'carrierwave-mongoid', :require => 'carrierwave/mongoid'

Using MongoDB's GridFS store

You'll need to configure the database and host to use:

CarrierWave.configure do |config|
  config.grid_fs_database = 'my_mongo_database'
  config.grid_fs_host = ''

The defaults are carrierwave and localhost.

And then in your uploader, set the storage to :grid_fs:

class AvatarUploader < CarrierWave::Uploader::Base
  storage :grid_fs

Since GridFS doesn't make the files available via HTTP, you'll need to stream them yourself. In Rails for example, you could use the send_data method. You can tell CarrierWave the URL you will serve your images from, allowing it to generate the correct URL, by setting eg:

CarrierWave.configure do |config|
  config.grid_fs_access_url = "/image/show"

Changes from earlier versions of CarrierWave with Mongoid support built in

This version supports ONLY version of mongoid ~> 2.1

You can use upload_identifier to retrieve the original name of the uploaded file.

In the earlier version, the mount_uploader-method for mongoid had been defined in lib/carrierwave/orm/mongoid. This code has been moved to carrierwave/mongoid. If you update from earlier versions, don't forget to adjust your require accordingly in your carrierwave-initializer.

The default mount column used to be the name of the upload column plus _filename. Now it is simply the name of the column. Most of the time, the column was called upload, so it would have been mounted to upload_filename. If you'd like to avoid a database migration, simply use the :mount_on option to specify the field name explicitly. Therefore, you only have to add a _filename to your column name. For example, if your column is called :upload:

class Dokument
  mount_uploader :upload, DokumentUploader, mount_on: :upload_filename

Known issues and limitations

Note that files mounted in embedded documents aren't saved when parent documents are saved. You must explicitly call save on embedded documents in order to save their attached files. You can read more about this here