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