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.
Install the latest release:
gem install carrierwave-mongoid
Require it in your code:
Or, in Rails you can add it to your Gemfile:
gem 'carrierwave-mongoid', :require => 'carrierwave/mongoid'
Follow the "Getting Started" directions in the main Carrierwave repository.
[Suggested] Add the field to your attr_accessor list for mass assignment protection:
attr_accessible :avatar, :avatar_cache
Now you can cache files by assigning them to the attribute; they will automatically be stored when the record is saved. Ex:
u = User.new u.avatar = File.open('somewhere') u.save!
Using MongoDB's GridFS store
In your uploader, set the storage to
class AvatarUploader < CarrierWave::Uploader::Base storage :grid_fs end
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 optionally 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 = "/systems/uploads" end
Bringing it all together, you can also configure Carrierwave to use Mongoid's database connection and default all storage to GridFS. That might look something like this:
CarrierWave.configure do |config| config.storage = :grid_fs config.root = Rails.root.join('tmp') config.cache_dir = "uploads" end
carrierwave-mongoid ~> 0.2.0 is only compatible with Rails 3.2 or higher.
carrierwave-mongoid ~> 0.1.1 depends on carrierwave ~> 0.5.7. This version of carrierwave is only compatible with Rails 3.1 or earlier.
Changes from earlier versions of CarrierWave <= 0.5.6
CarrierWave used to have built-in Mongoid support. This gem replaces that support and only only supports 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
If you'd like to avoid a database migration, simply use the
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
class Dokument mount_uploader :upload, DokumentUploader, mount_on: :upload_filename end
Known issues and limitations
Note that files mounted in embedded documents aren't saved when parent documents are saved. By default, mongoid does not cascade callbacks on embedded documents. In order to save the attached files on embedded documents, you must either explicitly call save on the embedded documents or you must configure the embedded association to cascade the callbacks automatically. For example:
class User embeds_many :pictures, cascade_callbacks: true end
You can read more about this here