diff options
Diffstat (limited to 'activestorage/lib/active_storage/attached')
| -rw-r--r-- | activestorage/lib/active_storage/attached/macros.rb | 82 | ||||
| -rw-r--r-- | activestorage/lib/active_storage/attached/many.rb | 55 | ||||
| -rw-r--r-- | activestorage/lib/active_storage/attached/one.rb | 60 |
3 files changed, 197 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/attached/macros.rb b/activestorage/lib/active_storage/attached/macros.rb new file mode 100644 index 0000000000..027112195f --- /dev/null +++ b/activestorage/lib/active_storage/attached/macros.rb @@ -0,0 +1,82 @@ +# frozen_string_literal: true + +module ActiveStorage + # Provides the class-level DSL for declaring that an Active Record model has attached blobs. + module Attached::Macros + # Specifies the relation between a single attachment and the model. + # + # class User < ActiveRecord::Base + # has_one_attached :avatar + # end + # + # There is no column defined on the model side, Active Storage takes + # care of the mapping between your records and the attachment. + # + # Under the covers, this relationship is implemented as a +has_one+ association to a + # ActiveStorage::Attachment record and a +has_one-through+ association to a + # ActiveStorage::Blob record. These associations are available as +avatar_attachment+ + # and +avatar_blob+. But you shouldn't need to work with these associations directly in + # most circumstances. + # + # The system has been designed to having you go through the ActiveStorage::Attached::One + # proxy that provides the dynamic proxy to the associations and factory methods, like +#attach+. + # + # If the +:dependent+ option isn't set, the attachment will be purged + # (i.e. destroyed) whenever the record is destroyed. + def has_one_attached(name, dependent: :purge_later) + class_eval <<-CODE, __FILE__, __LINE__ + 1 + def #{name} + @active_storage_attached_#{name} ||= ActiveStorage::Attached::One.new("#{name}", self) + end + CODE + + has_one :"#{name}_attachment", -> { where(name: name) }, class_name: "ActiveStorage::Attachment", as: :record + has_one :"#{name}_blob", through: :"#{name}_attachment", class_name: "ActiveStorage::Blob", source: :blob + + if dependent == :purge_later + before_destroy { public_send(name).purge_later } + end + end + + # Specifies the relation between multiple attachments and the model. + # + # class Gallery < ActiveRecord::Base + # has_many_attached :photos + # end + # + # There are no columns defined on the model side, Active Storage takes + # care of the mapping between your records and the attachments. + # + # To avoid N+1 queries, you can include the attached blobs in your query like so: + # + # Gallery.where(user: Current.user).with_attached_photos + # + # Under the covers, this relationship is implemented as a +has_many+ association to a + # ActiveStorage::Attachment record and a +has_many-through+ association to a + # ActiveStorage::Blob record. These associations are available as +photos_attachments+ + # and +photos_blobs+. But you shouldn't need to work with these associations directly in + # most circumstances. + # + # The system has been designed to having you go through the ActiveStorage::Attached::Many + # proxy that provides the dynamic proxy to the associations and factory methods, like +#attach+. + # + # If the +:dependent+ option isn't set, all the attachments will be purged + # (i.e. destroyed) whenever the record is destroyed. + def has_many_attached(name, dependent: :purge_later) + class_eval <<-CODE, __FILE__, __LINE__ + 1 + def #{name} + @active_storage_attached_#{name} ||= ActiveStorage::Attached::Many.new("#{name}", self) + end + CODE + + has_many :"#{name}_attachments", -> { where(name: name) }, as: :record, class_name: "ActiveStorage::Attachment" + has_many :"#{name}_blobs", through: :"#{name}_attachments", class_name: "ActiveStorage::Blob", source: :blob + + scope :"with_attached_#{name}", -> { includes("#{name}_attachments": :blob) } + + if dependent == :purge_later + before_destroy { public_send(name).purge_later } + end + end + end +end diff --git a/activestorage/lib/active_storage/attached/many.rb b/activestorage/lib/active_storage/attached/many.rb new file mode 100644 index 0000000000..59b7d7d559 --- /dev/null +++ b/activestorage/lib/active_storage/attached/many.rb @@ -0,0 +1,55 @@ +# frozen_string_literal: true + +module ActiveStorage + # Decorated proxy object representing of multiple attachments to a model. + class Attached::Many < Attached + delegate_missing_to :attachments + + # Returns all the associated attachment records. + # + # All methods called on this proxy object that aren't listed here will automatically be delegated to +attachments+. + def attachments + record.public_send("#{name}_attachments") + end + + # Associates one or several attachments with the current record, saving them to the database. + # Examples: + # + # document.images.attach(params[:images]) # Array of ActionDispatch::Http::UploadedFile objects + # document.images.attach(params[:signed_blob_id]) # Signed reference to blob from direct upload + # document.images.attach(io: File.open("~/racecar.jpg"), filename: "racecar.jpg", content_type: "image/jpg") + # document.images.attach([ first_blob, second_blob ]) + def attach(*attachables) + attachables.flatten.collect do |attachable| + attachments.create!(name: name, blob: create_blob_from(attachable)) + end + end + + # Returns true if any attachments has been made. + # + # class Gallery < ActiveRecord::Base + # has_many_attached :photos + # end + # + # Gallery.new.photos.attached? # => false + def attached? + attachments.any? + end + + # Directly purges each associated attachment (i.e. destroys the blobs and + # attachments and deletes the files on the service). + def purge + if attached? + attachments.each(&:purge) + attachments.reload + end + end + + # Purges each associated attachment through the queuing system. + def purge_later + if attached? + attachments.each(&:purge_later) + end + end + end +end diff --git a/activestorage/lib/active_storage/attached/one.rb b/activestorage/lib/active_storage/attached/one.rb new file mode 100644 index 0000000000..2e5831348e --- /dev/null +++ b/activestorage/lib/active_storage/attached/one.rb @@ -0,0 +1,60 @@ +# frozen_string_literal: true + +module ActiveStorage + # Representation of a single attachment to a model. + class Attached::One < Attached + delegate_missing_to :attachment + + # Returns the associated attachment record. + # + # You don't have to call this method to access the attachment's methods as + # they are all available at the model level. + def attachment + record.public_send("#{name}_attachment") + end + + # Associates a given attachment with the current record, saving it to the database. + # Examples: + # + # person.avatar.attach(params[:avatar]) # ActionDispatch::Http::UploadedFile object + # person.avatar.attach(params[:signed_blob_id]) # Signed reference to blob from direct upload + # person.avatar.attach(io: File.open("~/face.jpg"), filename: "face.jpg", content_type: "image/jpg") + # person.avatar.attach(avatar_blob) # ActiveStorage::Blob object + def attach(attachable) + write_attachment \ + ActiveStorage::Attachment.create!(record: record, name: name, blob: create_blob_from(attachable)) + end + + # Returns true if an attachment has been made. + # + # class User < ActiveRecord::Base + # has_one_attached :avatar + # end + # + # User.new.avatar.attached? # => false + def attached? + attachment.present? + end + + # Directly purges the attachment (i.e. destroys the blob and + # attachment and deletes the file on the service). + def purge + if attached? + attachment.purge + write_attachment nil + end + end + + # Purges the attachment through the queuing system. + def purge_later + if attached? + attachment.purge_later + end + end + + private + def write_attachment(attachment) + record.public_send("#{name}_attachment=", attachment) + end + end +end |