GitHub - shrinerb/shrine-mongoid: Mongoid integration for Shrine (original) (raw)

Shrine::Plugins::Mongoid

Provides Mongoid integration for Shrine.

Installation

gem "shrine-mongoid", "~> 1.0"

Usage

class ImageUploader < Shrine end

class Photo include Mongoid::Document include ImageUploader::Attachment(:image)

field :image_data, type: String # or type: Hash end

The Shrine::Attachment module will add model methods, as well ascallbacks and validations to tie attachment process to the record lifecycle:

photo = Photo.new

photo.image = file # cache attachment

photo.image #=> #<Shrine::UploadedFile @id="bc2e13.jpg" @storage_key=:cache ...> photo.image_data #=> '{"id":"bc2e13.jpg","storage":"cache","metadata":{...}}'

photo.save # persist, promote attachment, then persist again

photo.image #=> #<Shrine::UploadedFile @id="397eca.jpg" @storage_key=:store ...> photo.image_data #=> '{"id":"397eca.jpg","storage":"store","metadata":{...}}'

photo.destroy # delete attachment

photo.image.exists? #=> false

Callbacks

After Save

After a record is saved, Attacher#finalize is called, which promotes cached file to permanent storage and deletes previous file if any.

photo = Photo.new

photo.image = file photo.image.storage_key #=> :cache

photo.save photo.image.storage_key #=> :store

After Destroy

After a record is destroyed, Attacher#destroy_attached method is called, which deletes stored attached file if any.

photo = Photo.find(photo_id) photo.image #=> #Shrine::UploadedFile photo.image.exists? #=> true

photo.destroy photo.image.exists? #=> false

Skipping Callbacks

If you don't want the attachment module to add any callbacks to your model, you can set :callbacks to false:

plugin :mongoid, callbacks: false

Validations

If you're using the validation plugin, the attachment module will automatically merge attacher errors with model errors.

class ImageUploader < Shrine plugin :validation_helpers

Attacher.validate do validate_max_size 10 * 1024 * 1024 end end

photo = Photo.new photo.image = file photo.valid? photo.errors #=> { image: ["size must not be greater than 10.0 MB"] }

Attachment Presence

If you want to validate presence of the attachment, you can use ActiveModel's presence validator:

class Photo include Mongoid::Document include ImageUploader::Attachment(:image)

validates_presence_of :image end

Skipping Validations

If don't want the attachment module to merge file validations errors into model errors, you can set :validations to false:

plugin :mongoid, validations: false

Attacher

You can also use Shrine::Attacher directly (with or without theShrine::Attachment module):

class Photo include Mongoid::Document

field :image_data, type: String # or type: Hash end

photo = Photo.new attacher = ImageUploader::Attacher.from_model(photo, :image)

attacher.assign(file) # cache

attacher.file #=> #<Shrine::UploadedFile @id="bc2e13.jpg" @storage_key=:cache ...> photo.image_data #=> '{"id":"bc2e13.jpg","storage":"cache","metadata":{...}}'

photo.save # persist attacher.finalize # promote photo.save # persist

attacher.file #=> #<Shrine::UploadedFile @id="397eca.jpg" @storage_key=:store ...> photo.image_data #=> '{"id":"397eca.jpg","storage":"store","metadata":{...}}'

Pesistence

The following persistence methods are added to Shrine::Attacher:

See persistence docs for more details.

Contributing

You can run the tests with the Rake task:

License

MIT