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# 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
def blank?
attachment.blank?
end
# Associates a given attachment with the current record, saving it to the database.
#
# 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("/path/to/face.jpg"), filename: "face.jpg", content_type: "image/jpg")
# person.avatar.attach(avatar_blob) # ActiveStorage::Blob object
def attach(attachable)
blob_was = blob if attached?
blob = create_blob_from(attachable)
unless blob == blob_was
transaction do
detach
write_attachment build_attachment(blob: blob)
end
blob_was.purge_later if blob_was && dependent == :purge_later
end
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
# Deletes the attachment without purging it, leaving its blob in place.
def detach
if attached?
attachment.destroy
write_attachment nil
end
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
delegate :transaction, to: :record
def build_attachment(blob:)
ActiveStorage::Attachment.new(record: record, name: name, blob: blob)
end
def write_attachment(attachment)
record.public_send("#{name}_attachment=", attachment)
end
end
end
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